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Aici aveti la dispozitie 1144 trimiteri catre diferite scheme in ordine alfabetica.

1. "A" Weighting Filter For Audio Measurements
2. "CLONEPAC" memory module for Futaba 8UAF/8UAP
3. 0-10V control for RC servos
4. 1 Second Time Base From Crystal Osc.
5. 1 Watt 2.3 GHz RF Amplifier Using a MRF2001
6. 1.2GHz frequency counter
7. 1.5 Volt LED Flashers
8. 1.5 volt tracking transmitter
9. 1.5V LED flasher A (PDF)
10. 1.5V LED flasher B (PDF)
11. 1.5W Audio amplifier
12. 10 Stage LED Sequencer
13. 10 tricks for interfacing to the PIC16C508
14. 100W Amplifier
15. 100W Audio amplifier
16. 100W Guitar Amplifier
17. 100W HF Linear AMP
18. 100W RMS Amplifier
19. 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
20. 10MHz to 20MHz laser light detector (PDF)
21. 10W amplifier
22. 12 volt battery monitor
23. 12 Volt Lamp Dimmer
24. 12 volt power supply
25. 120MHz frequency counter
26. 120VAC Lamp Chaser Using Solid State Relays
27. 12B Battery condition indicator
28. 12-Bit ADC interface
29. 12C508 Smart Lock
30. 12V 30A power supply
31. 12V battery capacity tester
32. 12V DC electronic door chime
33. 12V Lead-Acid Battery Monitor
34. 12V Sump Pump Control
35. 12V supply for He-Ne laser
36. 12V to 120VAC inverter
37. 12V to 9V car coverter
38. 12VDC Fluorescent Lamp Driver
39. 12VDC To 120VAC Inverter
40. 13.5KV power supply
41. 136 kHz direct conversion receiver
42. 16 Stage Bi-Directional LED Sequencer
43. 16 Stage Bi-Directional LED Sequencer, other sequencer and flaser circuits
44. 16 Watt amplifier
45. 175KHz inductive pulse receiver (PDF)
46. 175KHz inductive pulse transmitter (PDF)
47. 18W Audio amplifier
48. 1A Variable Regulated Power Supply
49. 1KHz Sinewave generator
50. 1-line telephone status indicator (PDF)
51. 1uS light pulse descriminator plus F to V converter (PDF)
52. 1uS light pulse receiver plus post amp (MISC)
53. 1W CW Transmitter
54. 1W Fluorescent lamp night light (PDF)
55. 2 watt switching power supply
56. 2.3 GHz Power Amplifiers
57. 20 Watt / Channel Stereo Power Amplifier
58. 20 Watt Class-A Power Amplifier
59. 20 Watt GaAaFET Power on 2.3 GHz
60. 200-400 MHz voltage controlled oscillator
61. 20MHz VCSEL 3mW laser test circuit (PDF)
62. 20W Amplifier
63. 220V Flashing lights
64. 220V wiring detector
65. 2304 and 3456 MHz Power Amplifiers
66. 24-bit parallel port interface with 8255 for Commodore computer
67. 24-line PC digital interface (PDF)
68. 25W MOSFET amplifier
69. 28 LED Clock Timer
70. 2-Channel Power Amplifier
71. 2MHz RF Oscillator
72. 2N2222 40 Meter CW/DSB Transceiver
73. 2W amplifier
74. 2W Amplifier
75. 2-wire LCD interface using PIC16CF84
76. 3 - 12 MHz Signal Generator
77. 3 Transistor Audio Amp (50 milliwatt)
78. 300W Subwoofer Power Amplifier
79. 30m direct conversion receiver
80. 30-Meter QRP Transmitter for Morse Code
81. 3-Band equalizer
82. 3KHz low-pass filter plus audio amp (PDF)
83. 3rd brake light
84. 3W FM Transmitter
85. 4 band double-tuned preselector
86. 4 transistor transmitter
87. 40khz IR Tester
88. 40KHz laser burst detector (PDF)
89. 40KHz light receiver (PDF)
90. 40KHz TV-VCR repeater (PDF)
91. 40m direct conversion receiver
92. 418MHz Control RX/TX
93. 42 Mc Band to 88 Mc Band (retrofit converter) Project
94. 4-channel 8-bit analog-to-digital converter for PC
95. 4-line telephone status indicator (PDF)
96. 5 volt power supply
97. 5 watt, 80 meter QRP CW Transceiver
98. 5 Zone alarm circuit
99. 50 MHz frequency counter, voltage meter & SWR/PWR indicator
100. 50 MHz frequency counter, voltage meter & SWR/PWR indicator
101. 50 MHz to 146 MHz Converter
102. 50-150MHz Overtone Oscillator
103. 50MHz Assistant (Preamp & Power Amp.)
104. 50W Amplifier
105. 555 go / no-go tester
106. 555 time delay circuit
107. 555 timer 40khz IR Oscillator
108. 555 Timer IC Tester
109. 555 Timer Monostable Circuit Using Pushbutton
110. 555 Timer Tutorial + Circuits
111. 555 Tone Generator (8 Ohm Speaker)
112. 55W (Originally 75W) Power Amplifier
113. 56K RF Modem
114. 5W Fluorescent light intensity modulator (PDF)
115. 68HC11 based RDS decoder
116. 68HC11 stepper motor control
117. 6-Input mixer
118. 6V to 12V Converter
119. 7 Segment LED Counter
120. 741 Light Sensor
121. 8 note tune player
122. 8 Watt amplifier
123. 8 watt audio amp
124. 80 Meter CW ARDF receiver
125. 80 metre DSB transmitter
127. 80M ARDF direction finder
128. 80m Direct Conversion Receiver
129. 80m direct conversion receiver
130. 80W amplifier
131. 8254 Timer and Counter Board
132. 9 Second Digital Readout Timer
133. 9 Second LED Relay Timer
134. 9-pin null modem cable
135. 9V Xenon photoflash controller (PDF)
136. A 3m (100 MHz) small bug
137. A compact L-match ATU for portable use
138. A dual alternating flashing light circuit
139. A dual tandem flashing light circuit powered by a 9 volt battery
140. A Low Cost Thermal Peak Detection Charger
141. A Miniature High-Rate Speed Control with Brake
142. A PC-Based LowFER Frequency Synthesizer
143. A PIC-Based Keyboard Emulator
144. A Scenix (and PIC) Programmer
145. A Schottky-based Saw-to-Tri converter
146. A selection of robotics projects
147. A Serial Infrared Remote Controller
148. A Stereo Digital Volume Control based on the CS3310
149. A two-way Morse practice set
150. A Visual CW Zero Beating Aid
151. AA battery solar charger
152. AA battery solar charger
153. AC Line Current Detector
154. AC Line Powered LEDs
155. AC switching with TRIAC from TTL
156. Active 2nd Order Filters
157. Active Sub-Woofer and Controller
158. Adjustable continuity tested
159. Adjustable flashing LED
160. Adjustable power supply using LM317
161. Adjustable Strobe Light
162. Air flow detector
163. Air flow detector
164. Aladin interface
165. Alf: The Robotic Matchbox car
166. AM Broadcast Band Regenerative Receiver
167. AM oscillator for wireless microphones
168. AM Radio
169. AM receiver
170. AM/FM/SW active antenna
171. Amplified ear
172. Amplifier thermal protection
173. Amplifier timer
174. An Ambient-Light-Ignoring Infrared Active Motion Detector
175. An end-fed antenna, L-match coupler and resistive bridge for HF
176. An Inexpensive X-ray Machine
177. An On/Off Motor Control with Brake
178. Analog input section based on AD9220
179. Analog MIDI synthesizer
180. Analog opto-isolator
181. Analog pulse counter
182. Analog Signal Acquisition for PC Printer Port
183. Analog Tachometer for Gasoline Engines
184. Analog to digital conversion notes
185. Analog VU meter
186. Astable Multivibrator
187. AT89C2051 Digital thermometer and clock
188. AT89C2051 line-follower robot
189. AT89C2051 Night light saver
190. AT89C2051 real-time controller
191. AT89C2051 serial COMs to LED driver
192. AT89C2051/4051 Driving dot LED
193. AT89C2051/4051 Easy-Downloader
194. AT89C2051/4051connecting dumb terminal
195. AT89C2051/4051scanning 7-segment display and keypad
196. AT89C2051/4051stepper motor interface
197. AT89C51/52/55 Easy-Downloader
198. Atmel 8051 Flash Based-Microcontroller Programmer
199. Atmel 89C Series Flash Microcontroller Programmer
200. Audible continuity tester
201. Audible metronome
202. Audio / video distribution amplifier
203. Audio Amp Output Power Limiter
204. Audio amplifier output relay delay
205. Audio Graphic Equaliser
206. Audio graphic equaliser
207. Audio level indicator
208. Audio line isolator
209. Audio Millivoltmeter
210. Audio mixer
211. Audio notch filer
212. Audio output level meter
213. Audio preamp
214. Audio preamp circuits
215. Audio preamplifier
216. Audio Test Oscillator
217. Audio-video switch
218. Automated crib lights
219. Automatic door opener (PIC)
220. Automatic door opener with PIC12C508
221. Automatic message sender for CB
222. Balanced Line Driver & Receiver
223. Barcode scanner
224. Basement doorbell beeper (PDF)
225. Basic FM Transmitter
226. Basic increase in DC voltage
227. Basic op-amp circuits
228. Basic RF oscillator
229. Bat detector
230. Battery charge indicator
231. Battery low voltage alarm
232. Battery low voltage alarm 2
233. Battery pack discharger
234. Battery voltage monitor
235. Bedside lamp timer
236. Bell ring generator
237. Bias Tee
238. Bi-Directional 2.4 GHz One Watt Amplifier
239. Bi-Directional 900Mhz One Watt Amplifier
240. Bidirectionall power inverter
241. Big Mouth
242. Bingo!!! (on your tv)
243. Black Light
244. Block power switching module
245. Breath Alcohol Tester controlling a car ignition system
246. Bridging Adapter For Power Amplifiers
247. Broadband 2MHz optical fiber receiver (PDF)
248. Broadband 5MHz optical fiber receiver (PDF)
249. Budget timer
250. Bug detector
251. Bug detector
252. Build a Magnetic Field Immunity Tester
253. Build a PIC controlled DDS VFO, 0 to 6 MHz
254. Build an Infrared night scope
255. Build logic gates using discrete parts
256. Build Your Own Digital Setting Circles For Your Astronomical Telescope
257. Building an RF Remote Control System
258. Burglar alarm
259. C-52 EVB Robot Controller
260. Caller ID decoder
261. Capacitance meter
262. Capacitance sensor
263. Capacitance type liquid level measurement (PDF)
264. Car battery charger
265. Car clock
266. Car interval wiper
267. Car message display
268. Car Nicad charger
269. Car radio tunes the Amateur Bands
270. Casio datalogger
271. Casio organiser hardware
272. Centronics port D/A converters and low-pass filter
273. Chaos generator
274. Charge coupled bi-directional power MOSFET relay (PDF)
275. Charger for gel lead acid batteries
276. Cheap 40KHz clock
277. Chebyshev / Butterworth filters
278. Cigarette lighter 9V adaptor
279. Circuit that momentarily closes a pair of contacts at long intervals
280. Clock divider
281. Clock doubler
282. Clock generator
283. Closed-Caption Decoder
284. CMOS IC audio oscillator
285. CMOS oscillator
286. CMOS Toggle Flip Flop With Relay(CD4013)
287. CO2 controller for planted tanks
288. Code practice oscillator
289. Cold activated switch
290. Colour (Sound) Organ
291. Combination-controlled, fully customizable RF remote control
292. Compact 20 14 MHz direct conversion receiver
293. CompactFlash to IDE interface
294. Compost temperature and moisture monitor
295. Compter microphone
296. Computerize Your Room/Home
297. Condenser microphone hookup
298. Connect other circuits to PC joystick port
299. Connect two CD-ROM drives to one soundcard
300. Connecting PIC12C508 8 to 93AA46 serial eprom
301. Constant Current Battery Charger
302. Constant Temperature Circuit
303. Continuity tester
304. Continuity tester 2
305. Control 120VAC relay with TTL
306. Convenient PIC module
307. Convert Atari-style joystick to PC joystick port
308. Coutesy lamp
309. Cranial Electrotherapy Stimulator
310. Crystal 32.768KHz CMOS Oscillator
311. Crystal oscillator
312. Crystal radio
313. Crystal radio
314. Crystal radio
315. Crystal set that requires no antenna
316. Current loop interface
317. Cut Phone Line Detector
318. Cut phone line detector
319. CW RECEIVER 40/80 meter CW receiver
320. D Flip-flot one-shot circuits (PDF)
321. D.C. Mixer for music synthesizers
322. Dark activated switch
323. Darkness monitor
324. Darkroom camera shutter timer
325. Datalogger based on 68HC11
326. DC Accurate, Active RC Lowpass Filter
327. DC Motor-Driver H-Bridge Circuit
328. DC Push Button Motor Control Circuit
329. DC-DC Power Supply from car 12V battery to PC motherboard
330. Death of Zen (DoZ) - A New Class-A Power Amp
331. Decoding IR Remote Controls
332. Deluxe charge rate monitor
333. Detect fan failure with a single transistor
334. Detecting a telephone RING
335. DGPS receiver
336. Digisound ring modulator
337. Digital Call Sign Annunciator
338. Digital combination lock
339. Digital Delay Unit For Surround Sound
340. Digital noise generator (PDF)
341. Digital PC Oscilloscope
342. Digital thermometer
343. Digital volt meter
344. Digital volt meter with video output
345. Digital volume control
346. Digital/Standard Phone Line Tester
347. Diode Laser Power Supplies
348. Diode Laser Power Supplies
349. Dip Oscillator for HF
350. Direct Injection Box for Recording & PA Systems
351. Disco style Strobe Light
352. Discrete Bistable Flip Flop
353. Discrete Set/Reset Flip Flop
354. Distortion Analyser
355. DIT shutterglasses controller
356. Divide by 1.5 counter (PFD)
357. Do-it-Yourself VGA ro PPrPb Cable
358. Door knob alarm (PDF)
359. Doorphone intercom
360. Driver for multiple VGA monitors
361. Driving a relay with a CPU
362. Drum machine
363. Drum tone oscillators
364. DTMF tone decoder using Basic Stamp
365. Dual comparator forms temperature-compensated proximity detector
366. Dual phantom power pre-amp
367. Dual PIC16C84 prototype board
368. Dual Polarity Power Supply
369. Dual regulated power supply
370. Dual Voltage Controlled Filter w/Modulator
371. Dual Voltage Controlled Oscillator w/Modulator
372. Dynamic microphone to electret microphone input
373. ECG Amplifier
374. ECM Mic preamp
375. Economoy short-wave radio
376. Economy radar detector
377. El-Cheapo - A Really Simple Power Amplifier
378. Electret mic amplifier
379. Electret microphone powering circuits
380. Electric field & leakage detector
381. Electric field disturbance monitor
382. Electric field disturbance monitor
383. Electromagnetic field detector
384. Electromagnetic Levitator
385. Electronic auto stethoscope
386. Electronic canary
387. Electronic coin tosser
388. Electronic craps game
389. Electronic Dazer
390. Electronic door codelock with PIC16F84
391. Electronic fish lure
392. Electronic level
393. Electronic lock
394. Electronic metronome
395. Electronic night light
396. Electronic siren
397. Electronic thermostat
398. Electronic Thermostat Relay Circuit
399. Electronic whistle
400. Electroscope
401. ELF Monitor
402. Embedded controller based on MC68HC11F1
403. Embedded system to send e-mails (small TCP/IP stack)
404. EMF field probe
405. ESR Meter
406. ETI 603 Sequencer
407. Expandable 16 Stage LED Sequencer
408. Experimental data transmitter for fiber optics
409. Experimental fiber optic receiver
410. Experimental laser data link
411. Experimental macrovision remover
412. Fading Red Eyes
413. Fake Joystick circuit
414. Fantastic Atom Expander
415. Fast Audio Peak Limiter
416. Fax to modem interface
417. FCTS Project
418. FET audio mixer
419. Field strength meter
420. Filter Circuit for the Earthworm Seismic Data Acquisition System
421. Filtering PC bus POWER
422. Finger touch activated switch (PDF)
423. First response monitor
424. Fixed Voltage Power Supply
425. Flash slave trigger
426. Flashing Christmas LED display
427. Flashing High Intensity LED 3rd Brake Light
428. Flashing LED advertising badge (PDF)
429. Flashing neon christmas lights
430. Flashing Neons (NE-51 / NE-2)
431. Fluid level detector
432. FM Beacon Transmitter (88-108 MHz)
433. FM Bug
434. FM Telephone Bug
435. FM telephone bug
436. FM Telephone Transmitter
437. FM transmitter
438. FM transmitter
439. FM transmitter
440. Fogger smoke machine
441. Four channel fuzz box
442. Four Channel Wireless Transmitter and Receiver
443. Freign vocabulary recollector
444. Frequency agile 80m CW QRP transmitter
445. Frequency and capacitance meter
446. Frequency counter
447. Frequency Synthesizer
448. Fridge door alarm
449. Full Featured Transistor Tester
450. Full-duplex doorphone
451. Function generator
452. Furby circuit
453. Fuse blown indicator
454. Galaxy Noise Filter
455. GameBoy Camera Parallel Port Interface
456. GameBoy Cart Programmer
457. GameBoy LCD schematic
458. GameBoy MBC1 circuit equivalent
459. GameBoy Power & Cartridge schematic
460. GameBoy ROM+RAM+MBC1 Cart Schematic
461. GameBoy Schematic
462. Gate alarm circuit
463. Geiger counter
464. General purpose 48-bit ISA parallel I/O card
465. General purpose IR receiver
466. Generate video signals in real-time using a PIC16F84
467. Generating -5VDC from +5VDC
468. Generating a Delayed Pulse With a dual 555 Timer
469. Generating Negative 5 Volts from 9 Volt Battery
470. Genius Mouse schematics
471. Get power out of PC parallel port
472. Get power out of PC RS-232 port
473. Getting power from RS-232 interface
474. Glitch detector
475. Glow Plug driver for model engines
476. Griffith Observatory Tesla Coil
477. Guitar fuzz effect
478. Guitar Reverb Pedal
479. Guitar Tremolo Unit
480. Guitar Vibrato Unit
481. Gyrator circuit
482. H Bridge Motor Control Circuits
483. HamComm Interface
484. Hardware random bit generator
485. HeadBanger Headphone Amp
486. Headlight On reminder with Light
487. Headlight reminder
488. Headphone amplifier
489. Headphone amplifier
490. Headphone distribution amp
491. Headphone driving circuit for soundcards
492. Headphone monitor amp
493. Hear Amateurs on your FM Radio!
494. Hear Amateurs on your Shortwave Radio!
495. Heartbeat monitor
496. Heartbeat transducer
497. HeNe laser power supply
498. HeNe laser power supply schematics
499. HEXBOT robot
500. HF Linear RF power amplifier
501. Hi Fi preamp
502. Hi-Fi Headphone Amplifier
503. Hi-Fi PC Speaker System
504. High Current Power Supply
505. High Current Regulated Power Supply
506. High Quality Sound Mixer
507. High speed 20MSPS ADC interface
508. High Voltage High Current Power Supply
509. High-output square wave generator (PDF)
510. High-speed light receiver (PDF)
511. Hold function for Telephone
512. Honey Bee counter (PDF)
513. Horror movies sound effects
514. How to Build a 300MHz AM, RF Remote Control System
515. How to get power from PC to your circuits
516. http://www.rentron.com/SerialServo.htm
517. http://www.vekoll.vein.hu/~jap/electronic/codelock.html
518. HV supply: 12VDC in, 12KV out
519. I2C printer port adaptor
520. ICL7660 LED flasher
521. Icom CT-17 Logging & Control Interface Level Converter
522. IDE hard-disk interface for Amiga 500
523. Implementing Infrared Object Detection
524. Improved PL tone decoder
525. Improved saw to triangle converter
526. In-circuit electrolytic tester
527. Incoming call indicator
528. Infra/radio remote control transmitter/receiver with PIC
529. Infrared body heat detector
530. Infrared gate detector
531. Infrared relay with relay output
532. Infrared remote transponder
533. Infrared repeater
534. Infrared transmitter for locomotives
535. Intercom preamp
536. Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
537. Interface cables for various cell phones
538. Interfacing 16x2 character :LCD to parallel port
539. Interfacing 5 volt CMOS to 12 volt loads
540. Interfacing piezo elements to a microcontroller
541. Interfacing Sony control stick to Empeg
542. Interfacing the PIC16C508
543. Intermittent alarm generator
544. Ion detector
545. Ion detector
546. IR detector
547. IR detector / emitter
548. IR Illuminator
549. IR Laser light detector
550. IR Ranging
551. IR Receiver (Amplitude Modulated IR)
552. IR remote control
553. IR remote control extender
554. IR remote control system for PC
555. IR remote control tester
556. IR Transmitter for Audio (Amplitude Modulated IR)
557. ISA 48 I/O digital card
558. ISA 8-bit output card
559. Isolated Full Duplex RS232C Interface
560. Isolated RS232 for PIC16F84
561. Jacob's Ladder
562. JFET crystal testing oscillator
563. Joigging timer
564. Kirlian device supply
565. Lamp flasher/dimmer
566. Laptop Computer Serial Port Power Booster
567. Laser bug circuit
568. Laser diode transmitter
569. Laser power supply
570. Laser transmitter/receiver
571. LASER/LED light output intensity meter (PDF)
572. Latching relay driver
573. L-Band PHEMT LNA
575. LC filter design
576. Lead acid trickle charger
577. LED Audio VU Meter
578. LED Battery Condition Indicator
579. LED chaser
580. LED Flasher
581. LED flashing light
582. LED initials
583. LED Mood Light
584. LED Mood Light
585. LED Photo Sensor Circuit
586. LED pulser with audible output
587. LED RF Signal Meter
588. LED traffic lights
589. LF to HF Converter
590. Light Activated Relay
591. Light activated relay
592. Light beam receiver for laser pistols
593. Light detector
594. Light detector
595. Light direction sensor
596. Light sensing RF transmitter
597. Light Sequenced Candelabra
598. Light/dark detector
599. Lightning Activated Camera Shutter Trigger
600. Line in use indicator (PDF)
601. Line level signal to microphone input adapter
602. Line Output / Flyback transformer tester
603. Line powered 60Hz clock generator (PDF)
604. Linearized RF detector
605. Line-powered Xenon flash transmitter (PDF)
606. Linkwitz Cosine Burst Generator
607. Linux Infra-red Remote Control (LIRC)
608. Live line detector
609. LM 1800 FM stereo decoder
610. LM317 adjustable power supply
611. LM317 Regulator With Pass Transistor
612. LM317 Variable Voltage Regulator
613. LM358 preamp
614. LM383 12V Amplifier
615. LM3909 LED flasher
616. LM3911 temperature controller
617. LM3914 battery monitor
618. Load Sensing Automatic Switch
619. Logic probe
620. Logic probe
621. Long period timer
622. Long-period watchdog timer
623. Loudspeaker Protection and Muting
624. Low battery voltage flasher (PDF)
625. Low current LED flasher (PDF)
626. Low frequency clock
627. Low Frequency Sinewave Generator
628. Low impedance microphone amplifier
629. Low Noise Balanced Microphone Preamp
630. Low Noise Microphone Preamplifier
631. Low Power DC to DC Converter
632. Low Power FM Transmitter
633. Low Power LED Voltmeter
634. Low Power LED Voltmeter
635. Low Power Op-Amp - Audio Amp (Intercom)
636. Low Voltage , High Current Time Delay Circuit
637. Low voltage DC motor speed controller
638. Low-level audio amp
639. Low-power optical interrupter (PDF)
640. LTC1265 Nicad charger
641. LX-800 Lighting system
642. Machine power loss beepter (PDF)
643. Machine vibration triggers hour meter (PDF)
644. Macrovision code remover
645. Magnetic cartridge amplifier
646. Magnetic levitation circuit
647. Mains clock controller using AT89C2051
648. Many video amplifier circuits includiing transmission over UTP (PDF)
649. Mark II video digitiser
650. MAX924 bar-graph level gauge
651. MC1374 based TV transmitter
652. Memory game
653. Metronome and pitch generator
654. Micro Power AM Broadcast Transmitter
655. Micro Power FM Broadcasting Circuits
656. Microcontroller interface for 5KW microwave oven
657. Microphone amplifier
658. Microphone Circuit Test Oscillator
659. Microphone mixer
660. Micro-power 40KHz burst laser diode driver (PDF)
661. Micropower Event Transmitter
662. Micro-power over temperature alarm (PDF)
663. Micropower pulse generator (PDF)
664. Micro-power pulse generator (PDF)
665. Microprocessor RS-232 Reset
666. Micro-Spy with FETs
667. Micro-Spy with TTL
668. Micro-Spy with USW
669. MIDI to CV interface
670. Mini metronome
671. Miniature FM transmitter
672. Miniature FM Transmitter #1
673. Miniature FM Transmitter #2
674. Miniature FM Transmitter #3
675. Miniature loop alarm
676. MiniLOGGER V1.0
677. Minimalist Discrete Hi-Fi Preamp
678. Modem Rockwell RCV336/ACF model V1433VQR ext.
679. Modular relay system
680. Modulated laser diode tester (PDF)
681. Modulated light received (PDF)
682. Moisture alarm
683. Monostable Flip Flops (one shot)
684. More accurate PC/AT clock
685. Morse Adaptor for your VHF/UHF FM rig
686. Morse Code Beacon Keyer
687. Morse Code Practice Keyer 1
688. Morse Code Practice Keyer 2
689. Motorcycle turn-signal system
690. MS Stereo Decoder
691. MS Stereo Microphone
692. Multi-chip programmer
693. Multiple Feedback Bandpass Filter
694. Multiple voltage power supply
695. Muscular Bio-stimulator
696. Musical Instrument (Expandable) Graphic Equaliser
697. MW preamplifier
698. NASA TURFTS - TDRSS User RF Test Set
699. NCDS Interface Schematic for Nokia 3110, 8110, 8110i
700. NE555 Low Voltage Battery Disconnect Circuit
701. Negative ion generator
702. Negative voltage generator
703. Network of RS485 temperature sensors
704. Nicad battery charger
705. Nicad Battery Discharger/Capacity Indicator
706. Night light saver (PIC12C508)
707. Nocturnal animals whisker
708. Noise generator
709. Nokia 3210 MBUS interface
710. Nokia 51xx interface cables
711. Null Printer Adapter
712. Octave screamer
713. Old-fashioned siren effect
714. One transistor FM receiver
715. One Valve CW transmitter
716. Op-amp based FM transmitter
717. Opamp Design and Test Board
718. Op-Amp Radio
719. Optical sensor using PIC12C508
720. Optical Theremin - electronic musical instrument
721. Paradoxical Sound Syntheizer
722. Parallel (Printer) Port Interface
723. Parallel port ADC based on MAX147
724. Parallel port ADC using ADC0804
725. Parallel port ADC/DAC
726. Parallel port relay interface
727. Parallel port servo controller
728. Parallel print capture system
729. Parametric And Sub-Woofer Equaliser
730. Parking sonar
731. PC based 7-segment rolling display
732. PC Based Digital Storage Oscilloscope Mk3
733. PC based EFI programmer
734. PC IR receiver based on PIC16F84
735. PC IR Remote Control
736. PC serial port receiver
737. PC speaker volume control circuit
738. PC thermometer
739. PC-Based Digital Storage Oscilloscope (DSOA)
740. Peak reading audio level meter
741. Peak-reading meters
742. Pedometer
743. Perimeter monitor
744. Personal silent alarm system
745. Personal stereo audio amp
746. pH meter with calibration
747. Phase Shift Radio Direction Finder
748. Phase shifter
749. Phased lock loop schematic
750. Phone Busy Indicator
751. Phone in use circuit
752. Phone in-use
753. Phone In-Use Light
754. Phone Line to Audio
755. Phone Off-Hook Indicator
756. 'phone rang' indicator light
757. Phone to audio interface
758. Phone-In-Use indicator
759. Phono preamp
760. Phono Preamp
761. Phono Preamps For All
762. PIC 5x7 display
763. PIC controlled DDS VFO, 0 to 6 MHz
764. PIC logic probe with pulser
765. PIC Project #1 - RS232 to I2C Interface
766. PIC R/C Servo Controller
767. PIC12C508 Night-light saver
768. PIC16C84 VT-52 Emulator for Linux
769. PIC16F84 Based Morse Code Reader
770. PIC16F84 debugging terminal
771. PIC16F84 line following robot
772. PIC16F84 mechanically scanned clock
773. PIC16F84 miniature real-time controller
774. PIC16F84 programmer
775. PIC16F84 Range Finder Project
776. PIC16F84 Serial I/O-expander with PicBasic
777. PIC16F84 sound controlled Christmas lights
778. PIC16F84/PIC16F87x-In-System-Programmer
779. PICADC - a free, PIC based "intelligent" A/D converter
780. PIC-FC1 Frequency Counter
781. PIC-Programmer 2
782. PIC-Tock video clock
783. Picxie 2 - 8x8 Animated LED Signboard
784. Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
785. Pine Racecar Victory Judge
786. Pink Noise Generator for Audio Testing
787. PIXpand
788. Plane locator
789. Plane locator 2
790. Plant watering watcher
791. Popcorn direct conversion receiver
792. Portable 40W CW transmitter
793. Portable CD Player Adapter For Car
794. Portable headphone amplifier
795. Power Amplifier Clipping Indicator
796. Power reminder beeper (PDF)
797. Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
798. Power Tool Torque Control
799. PowerGlove Interface
800. Power-line Appliance Controller
801. Power-Off Time Delay Relay Circuit
802. Power-On Time Delay Relay Circuit
803. Precision audio millivoltmeter
804. Printer port ADC
805. Programmable light-activated relay
806. Project: NES to Atari 2600 controller interface
807. Proximity alarm
808. PSX controler to PC MIDI converter
809. Pulse Reading Logic Probe
810. Pulse Shaping on the Palm Pilot
811. Pulse Width Modulation DC Motor Control
812. Pulse width modulators (PWM)
813. Pulse width to voltage converter
814. Pulsed double-heterostructure laser driver
815. Pulsed LED test circuit (PDF)
816. Push Button Switch Debouncer
817. Pushbutton one-shot and latch (PDF)
818. Push-Pull Class A 2A3 Stereo Amp
819. Push-Pull Class A Amp using type 5687 dual triodes
820. PWM DC Motor Speed Control
821. PWM light bulb regulator
822. PWM Motor Speed Controller / DC Light Dimmer
823. PWM Motor/Light Controller
824. PWM Motor/Light Controller
825. PWM Motor/Light Controller variants
826. Pyroelectric Infrared Sensor
827. Quiz show indicator
828. R/C Receiver <-> Joystick Port Interface for Flight Simulators
829. R-399-A Communications Receiver
830. Radiation Dosage-Rate Meter
831. Radio Control Battery Backup
832. Radio Control Electric Switch
833. Rain detector
834. Random noise generator
835. RC Notch Filter (Twin T)
836. RCM710 Electronic Scale
837. RDS Encoder
838. RDS Encoder - digital part
839. Receiver
840. Receiver building blocks
841. Regenerative shortwave receiver
842. Regulated 12V supply
843. Relay delay circuit
844. Remote control encoder/decoder with PIC16C620 & PIC12C508
845. RF actuated CW monitor
846. RF Modem Robotics Project
847. RF Power Meter for the QRPer
848. RF Sensing relay driver
849. RF Sniffer <.5 to >500 MHz
850. RIAA Equalized Stereo Phono Preamp
851. RIAA phono amplifier
852. Ringing Phone Light Flasher
853. Room noise detector
854. 'Rounding Off' a square wave
855. RS 485-RPT Schematic
856. RS-232 Laser Transceiver
857. RS-232 line monitor and loopback cables
858. RS-232 surge protection
859. RS232C Level Converter
860. RS485-Version of the SAB80C535-Microcontrollerboard
861. Safety indicator light
862. Saw to triangle converter
863. Scaling ADXL50 accelerometer outpu
864. ScanMate audio activated recorded
865. Schematic of a standard PC joystick
866. Sega 3D glass interfacing circuits
867. Self Oscillating Amplifier for Distortion Testing
868. Sensitive FM transmitter
869. Sensor Electronic Tracker with H-Bridge Drive
870. Sensor Electronic Tracker with Simple Solar Charge Controller
871. Sequencing Neons (NE-51 / NE-2)
872. Serial Port A/D-converter
873. Serial to ECP interface
874. Serial to parallel converter using the AT89C2051
875. SHARP palm-top/hand-held to RS232 serial converter
876. Short-circuit beeper
877. Shortwave conveter for scanners
878. Signal Detecting Auto Power-On Unit
879. Signal generator for signal tracer
880. Signal tracer & injector
881. Signal tracer / injector
882. Simple +5V power supply circuit
883. Simple 6-Digit 40MHz Frequency Counter Module
884. Simple alarm system
885. Simple BFO metal detector
886. Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
887. Simple Car Preamplifier and Artificial Earth
888. Simple charge rate monitor
889. Simple circuit to connect telephone equipment to audio mixer
890. Simple colour organ
891. Simple DC Adapter Power Supply
892. Simple event counter
893. Simple field strength meter
894. Simple flashing light circuit
895. Simple flashing light circuit
896. Simple flashing light circuit
897. Simple infra-red detector
898. Simple infrared remote control
899. Simple IR transmitter circuit
900. Simple laser communicator
901. Simple lie detector
902. Simple light sensor adapter for oscilloscope
903. Simple line mixer
904. Simple microphone preamplifier
905. Simple microphone preamplifier
906. Simple MIDI tester
907. Simple MIDI-to-CV converter
908. Simple nitrogen spark generator (PDF)
909. Simple Op-Amp Radio
910. Simple PC SmartCard reader
911. Simple pH meter
912. Simple Phone Tap
913. Simple polarity detector
914. Simple RF transmitter
915. Simple RS-232 serial port buffer circuit
916. Simple RS232C Level Converter using Transistors
917. Simple Surround Sound Decoder
918. Simple train detector using ambient light and a photocell
919. Simple TV transmitter
920. Simple two line output combiner
921. Simple UHF dummy load
922. Simple Variable Voltage Source
923. Simple VOX circuit
924. Simplest Ever Amplifier Bridging
925. Simulate the Gyralite (dual flashing headlights).
926. Sine wave generator
927. Single cell lithium battery charger
928. Single Chip 50 Watt / 8 Ohm Power Amplifier
929. Single Ended Class A2 SV811-10 Stereo Amp
930. Single-Supply Twin T Butterworth Low Pass Filter
931. Slot car TV cronograph
932. Small Radio Transmitter
933. Smart battery charger
934. Smooth Tone Clickless CW Sidetone Generator
935. SN754410 Dual Motor Driver Board
936. Soft-Start Circuit For Power Amps
937. Solar cell Nicad charger
938. Solar Charged LED Flashlight
939. Solar Panel Charge Controller / Low Voltage Disconnect Circuit
940. Solar Panel Charge Controller / Low Voltage Disconnect Circuit
941. Solar Panel Current Meter
942. Solar Panel Current Meter
943. Solar power recharger
944. Solar power supply
945. Solar Tracker
946. Solenoid starter
947. Solid state relay (PDF)
948. Some simple test equipment to build
949. SOP direct conversion receiver
950. Sound amplifier
951. Sound Blaster Microphone Preamplifier
952. Sound detector
953. Sound level meter
954. Sound operated switch
955. Sounds effects unit
956. Spark-gap transmitter
957. SPDIF-interface to AudioPCI
958. Speaker signals to line level inputs
959. Speaking clock using PIC & ISD device
960. Speaking doorbell using PIC & ISD device
961. Speed limit alert
962. Spread spectrum transceiver controlled by PIC
963. Spring reverb
964. Spring reverb unit
965. Spring reverb unit
966. Spring Reverb Unit For Guitar
967. Square wave oscillator
968. Square wave to sine wave converter
969. Stable 40KHz clock
970. Staircase wave generator
971. Stepper motor controller
972. Stepper motor positioner
973. Stereo compressor
974. Stereo Ducker
975. Stereo IR audio receiver
977. Stereo line driver
978. Stereo Width Controllers
979. Strain gauge sensor
980. Strobe light
981. Subwoofer Equaliser
982. Sun tracking circuit for solar arrays
983. Super 80 ultra-simple SSB receiver for 3.5 MHz
984. Super GameBoy schematic
985. Superregenerative 27MHz receiver
986. Supervisory Control And Data Aquisition project (for Home Automation and Security)
987. S-video to composite video adapter
988. Switch debounce using 555
989. Switching solenoid driver
990. Switch-on delay circuit
991. Synthesizer schematics
992. Talking phone dial monitor
993. Talking PIC - based on SP0256
994. Talking receiver
995. Talking YODA project (PIC16C84)
996. Tan timer
997. TCP/IP stack and WWW server in a PIC16F84
998. TDA2030 8 Watt amplifier
999. Telephone Audio Interface
1000. Telephone Hold Button
1001. Telephone in use light
1002. Telephone In-Use LED Indicator
1003. Telephone In-Use Relay Circuit
1004. Telephone Line Monitor
1005. Telephone line simulator
1006. Telephone privacy adapter
1007. Telephone Recorder
1008. Telephone recording circuit
1009. Telephone Ring Generator Using 60Hz Power Transformer
1010. Telephone Ring Generator Using Switching Power Supply
1011. Telephone ringing circuits
1012. Temperature compensated pH meter
1013. Temperature controlled based on AT89CX051
1014. Temperature Controlled NICD Charger
1015. Temperature monitor
1016. Temperature sensitive oscillator
1017. Tesla coil / HV generator
1018. Tesla power receiver
1019. The ESP SIM (Sound Impairment Monitor)
1020. The MRX-40 Mini Receiver
1021. Theremin controller
1022. Thermoelectic controller (scriptable thermometer)
1023. Thermo-Fan To Keep Your Amp Cool
1024. Three input first response monitor
1025. Tilt sensor for the PalmPilot
1026. Time Delay Relay
1027. Time Delay Relay
1028. Time Domain Reflectometer (TDR)
1029. Time to dust indicator (PDF)
1030. Timed beeper
1031. Tone control
1032. Tone control
1033. Tone detector
1034. Tone generator
1035. Toroidal coil RF shortwave receiver
1036. Touch activated alarm system
1037. Touch Activated Lamp
1038. Touch switch
1039. Touch switch
1040. Touch Switches
1041. Tracking transmitter
1042. Transformerless Power Supply
1043. Transisor organ
1044. Transistor relay driver
1045. TRF AM Receiver circuit
1046. TRIAC light dimmer
1047. Triangle and Squarewave Generator
1048. Tri-Waveform Generator
1049. Turn signal alarm
1050. TV transmitter
1051. TV/Radio antenna cable galvanic isolator
1052. Two Tone Audio Oscillator (use for SSB tests)
1053. Two tone train horn
1054. Two transistor audio amplifier
1055. Two Transistor LED Flasher
1056. Two Valve 40m CW Transmitter
1057. Two-band radio
1058. Two-tone siren
1059. Two-tone siren
1060. UHF - 100W Transistorized amplifier
1061. UHF oscillator
1062. Ultimate battery low voltage alarm
1063. Ultra Simple Bass Guitar Compressor
1064. Ultrasonic dog whistle
1065. Ultrasonic generator
1066. Ultrasonic Range & Imager
1067. Ultrasonic range finder circuit
1068. Ultrasonic remote control & alarm system
1069. Ultrasonic sound receiver
1070. Ultrasonic switch
1071. Ultrasonic transducer oscillator circuit
1072. Ultrasound detector
1073. Underwater microphone
1074. Universal IR-Remote Lamp Controller
1075. Universal telephone hold
1076. Unplugged power cord alarm
1077. Unregulated power supply
1078. USB to infrared adapter
1079. Use amplifier phono input as line level input
1080. Use old phones as an intercom
1081. Using the 78xx Series Voltage Regulators
1082. Using the joystick port as general purpose input
1083. Variable 3 - 24 Volt / 3 Amp Power Supply
1084. Variable Amplifier Impedance
1085. Variable DC power supply
1086. Variable Dual Lab Power Supply
1087. Variable power supply
1088. Variable Voltage and Current Power Supply
1089. Variety of quick designs
1090. Variety of receiver converter projects
1091. Varying Brightness AC Lamp
1092. Versatile electronic timer
1093. Very basic circuits
1094. Very loud beeper (PDF)
1095. VGA converter for video projectors and fixed frequency monitors
1096. VGA to PAL and NTSC converter
1097. VGA to TV converter
1098. Vibrating pocket bug detector
1099. Video amplifier
1100. Video digitiser
1101. Video signal amplifier
1102. Video signal edge enhancement
1103. Video switcher
1104. Video switcher (PDF)
1105. Visual metronome
1106. Vocal zapper
1107. Voice record/playback using ISD 1000A
1108. Voltage comparator switch
1109. Voltage controllable LFO
1110. Voltage controlled amplifier
1111. Voltage Controlled Mixer w/Modulator
1112. Voltage Controlled Panner
1113. Voltage doubler
1114. Voltage Inverter
1115. Voltage Inverter
1116. Voltage inverter
1117. Voltage probe
1118. Vox AC30 Guitar Amplifier Simulator
1119. VU And PPM Audio Metering
1120. Warbler
1121. Water seepage alarm (PDF)
1122. Water-level sensor
1123. Web-based thermometer project
1124. Weign Bridge generator
1125. Whistle detector using 8-pin PIC
1126. Whistle responder
1127. White noise generator
1128. Wide-swing Variable Crystal Oscillator
1129. Winking LEDs
1130. Wire tracer
1131. Wireless Auto Tachometer
1132. Wireless event receiver
1133. Wireless IR headphone receiver
1134. Wireless IR headphone transmitter
1135. Wireless Liquid Level Sensing for Restaurant Applications
1136. Wireless microphone
1137. Wireless microphone
1138. Wireless microphone
1139. Wireless motion detector
1140. Xenon Strobe Light
1141. XTAL locked tone transmitter
1142. Z80 core #1- Z80 CPU and memory (PDF)
1143. Z80 core #2- Z80 CTC and SIO
1144. Z80 core #3- RS-232 drivers for the SIO
1145. Zener diode tester
1146. ZN414 AM receiver
1147. ZN414 shortwave receiver