Circuits for the Hobbyist by VA3AVR

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Tony's Message Forum   Ask your questions here. Someone may answer them.

Active Power Zener Active Antenna for AM-FM-SW Active Antenna for HF-VHF-UHF Active FM Antenna Amplifier Aviation Band Receiver  Alternating On-Off Switch  PCB for Dan Fink's Anemometer (sold out!) Audio Booster with 1 Transistor Audio Pre-Amplifier #1 Automatic 9-Volt NiCad Battery Charger Auto-Fan, automatic temperature control AT-121 Basic Driving Circuit Basic IC MonoStable Multivibrator Basic RF Oscillator #1 Basic LM3909 Led Flasher Battery Monitor for 12V Lead-Acid Battery Tester for 1.5 & 9V Battery (NiCad) Rejuvenator Bench Top Power Supply, Part 1 Bench Top Power Supply, Part 2 Bench Top Power Supply, Part 3 Bench Top Power Supply, Part 4 Pics Bench Top Power Supply, Auto-Fan Bicycle Light with charger (soon) Birdie Doorbell Ringer Broadcast-Band RF Amplifier 'Bug' Detector with Beep Car Back-up Alarm Car Converter for 12V to 9V Car NiCad Charger Christmas Lights Tester Crystal Tester, #1   Crystal Tester, #2  Coin Tosser Compressor-Mate  Clock Generator Continuity Tester, Low-Voltage Continuity Tester, Smart Continuity Tester, Latching  Cut Phone Line Detector Dark/Light Activated Relay DC Motor Reversing Circuit DC Motor Control Circuit DCS 400 Multipurpose Connector  Dome Light Extender DSL Filter (phone-line) Dual 12V Power Supply Electronic Canary (Doorbell) Fluid-Level Detector Fox & Hound, wire tracer Gadgets for Radio Control Page Gel Cell Charger, I Gel Cell Charger, II Headlight Alarm Heat Sensor Glowplug Driver (a) Glowplug Panel (b) HotChek - Brent's website Hot Wire Foam Cutter, 1 - by Tom Weedom Hot Wire Foam Cutter, 2 - by Charles Wenzel Hot Wire Foam Cutter, 3 - by Steven Mohr Hot Wire Foam Cutter, 4 - by JoeBoy Hot Wire Foam Cutter, 5 - by The Hermit MachineShop Hot Wire Foam Cutter, 6 - by Al Schoepp Hot Wire Foam Cutter, 7 - by Rocket Team Vatsaas Hot Wire Foam Cutter, 8 - by Daniel Hartman Hot Wire Foam Cutter, 9 - by D.J.Kammo (pterodactylus) Hot-Wire Foam Cutter, 10 - by Tony van Roon High-Voltage Projects you can Build Lantern Flasher/Dimmer Latching Continuity Tester  Lead Acid Battery Charger with Float Lead Acid Battery Charger Lead Acid Charger (Gel Cell) Led Flasher, 2 transistor Leds Flasher, alternately LED Pilot Light (AC or DC) Light Sensor With Hysteresis Lithium-Ion Charger, Single cell Logic Probe(1), with pulse, TTL/CMOS Logic Probe(2), with pulse, TTL/CMOS Logic Probe(3), Audible, TTL/CMOS Main Fuse-Panel Emergency Light Micro-Spy with FET's Micro-Spy with USW Micro-Spy with TTL Miniature FM Transmitter #1 Miniature FM Transmitter #2 Miniature FM Transmitter #3 Miniature FM Transmitter #4 Miniature FM Transmitter #5 Miniature FM Transmitter #6 Miniature Tracking Transmitter  Mini-Drill variable Powersupply

Missing Pulse Detector (Basic) Morse Code Practice Keyer, I Morse Code Practice Keyer, II Motor Accu Lader  (Dutch language) Motorcycle Battery Charger Motorcycle Low Voltage Warning No-Hassle 3rd Brakelight hookup Power Supply Converted from a PC - by Andy Batts Practical, 2-wire Intercom Pulse Timer, 555 Pulse Width modulator, 555 Pulse Width modulator, 4093 Radio Shack Special - Transmitters by Patrick Cambre Relays - Sound Activated, #1 Relays - Sound Activated, #2 Relays - Transistor Boosted Relays - Dark Activated Relays - Delayed Turn-on Relays - Automatic Turn-off Relays - Long Duration Relays - 12 Sec to 90 min Relays - Long Duration--1 to 100 min Relays - Long Duration--1 min to 20 hrs Relays - Self Latching RF Transmitter, light sensing RJ45 Cable Tester by Bruce Marcus Subcarrier Adapter Listen to those hidden FM transmissions ScanMate Your (Radio) scanner buddy-pcb available! Servo Modification - For contineous rotation Simplest R/C Circuit Simplest RF Transmitter Simple Transistor Audio PreAmplifier Single IC Audio Preamplifier Single Cell Sealed Lead Acid Charger - by Søren  Solar Cell NiCad Charger Solid State Relay Telephone Transmitter (FM)  Thermo Alarm Thermostat Third Brake Light Pulser Touch Activated Alarm System Touch Switch using Transistors Two-Tone Trainhorn Universal Flasher Circuit Variable Power Supply, 1 - 30V @ 1.5A  1-04-2006 Wailing Alarm Water-level Sensing and Control Waterpump Safety Guard for Fish-pond Weller WLC100 Soldering Station Wireless Microphone Xmas Lights Tester Zap Adapter 1.5V Tracking Transmitter  (with Video Clip) 2 Transistor 2 LED Flasher 4 Transistor Tracking Transmitter 4 Transistor Transmitter  7.2V Field Charger (.pdf file) 9-V Stabilized Powersupply 9 to 9 pin (Female) Nullmodem Cable 12V to 9V with a LM317 30-Meter QRP Transmitter for Morse Code 555 DC-AC Inverter 555 Timer IC Tester 555 Go No/Go Tester More advanced Electronic Symbols Template Test Probes with retractable tips Voltage Detector (VoltAlert) Relays PCB's 4sale High-Voltage Projects you can Build 555 Timer/Oscillator 741 Op-Amp Capacitors Coils Crystal Oscillators (SOON) MosFet Test Piezo Education/Tutorial PLL Resistor Color Code Tutorial SCR Tester Triac Test UJT Test Toroids Relays, Relay Drivers, Solid-State "Green" means on-line, "Red" means off-line Bookmark this valuable page with 'Ctrl-D'.

Just in case you're gonna ask: All drawings are created with Paint Shop Pro

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Circuits Archive - Older circuits. Most are working, some are not. Could be still useful.
Tony's Data Sheets - Data Sheet for common Semiconductors.
Data Sheets Archive - Link to tons of data sheets.
Filter Solutions - PC windows based filter synthesis and analysis software.
RP Electronics - Panel Meters, Analog/LCD.
Radio Shack Partnumbers - Most common order numbers for my circuits.
Resistor Value Calculator - By Danny Goodman, AE9F.
Transistor 'SM' marking codes by Philips BV.
TUP/TUN/DUS/DUG European transistor replacement system.
PN100/200 - Data Sheets for the PN100 and PN200.
LF13741 - Monolitic JFET Input OpAmp Data Sheet.
MC14069UB - CMOS Hex Inverter Data Sheet.
Toroids, RF/EMI Cores - Variety of commonly used toroids, colors, etc.
Guelph Amateur Radio Club - GARC--Official Homepage.
Jonathan's Electronics Message Forum - More help if you need it!

  Other Interesting Links - Links to other interesting and informative Electronics Websites

     

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DISCLAIMER: The University of Guelph, host of Tony's Website! or Tony van Roon himself, take no responsibility whatsoever for the use and/or implementation thereof, or the misuse leading to damage to equipment, property, or life, caused by the above circuits. Check with local, provincial and federal laws before operating some of these devices. You may also check your life insurance policy and/or the fact if they cover death by electrocution if you intend to play with Micro-wave ovens and other possible lethal HV devices. Safety is a primary concern when working with high power circuits or con/inverters. Play it safe!

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Copyright © 1995, Tony van Roon (VA3AVR). ALL RIGHTS RESERVED.
Last Updated July 31, 2006