Circuits for the Hobbyist
by VA3AVR


circuits

Active Power Zener
Active Antenna for AM-FM-SW  R1/C2
Active Antenna for HF-VHF-UHF
Active Antenna, easy to build
Active FM Antenna Amplifier
Alternating On-Off Switch, #1 
Alternating On-Off Switch, #2 
Amperage Booster for 78xx's
Aviation Band Receiver
PCB for Dan Fink's Anemometer (0 available!)
Audio Booster with 1 Transistor 
Audio Pre-Amplifier #1
Automatic 9-Volt NiCad Battery Charger
Auto-Fan, temperature control  
AT-121 (3W) to AT-150 (2W) Converter 
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  Copyright Theft
Bench Top Power Supply, Auto-Fan
Birdie Doorbell Ringer
Broadcast-Band RF Amplifier
Bug Detector with Beep
Bug Detector  Q1 outline
Car Back-up Alarm
Car Converter for 12V to 9V
Car NiCad Charger
Christmas Lights Tester
Coin Tosser
Compressor-Mate
Clock Generator
Constant Current Charger
Continuity Tester, Low-Voltage
Continuity Tester, Smart
Countersurveillance Monitor
Crow Bar #1
Crow Bar #2
Crystal Radio--make your own 
Crystal Tester, #1 
Crystal Tester, #2
Crystal Tester, #3
Cut Phone Line Detector
CW/SSB Radio Add-on SOON
Dark/Light Activated Relay
DC Motor Reversing Circuit
DC Motor Control Circuit
DCS 400 Multipurpose Connector
DSL Filter (phone-line)
Dual 12V Power Supply
Egg Timer
Electronic Canary (Doorbell)
Electronic Gadgets for Radio Control 
Fish Caller
Fluid-Level Detector
Fox & Hound, wire tracer
Gel Cell Charger, I
Gel Cell Charger, II
Glowplug Driver (a)
Glowplug Panel (b)
Headlight Alarm
Heat Sensor
High-Voltage Projects you can Build 
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
Lantern Flasher/Dimmer
Latching Continuity Tester  PCB/Layout, 7-20-2010
Lead Acid Battery Charger with Float
Lead Acid Battery Charger
Lead Acid Charger (Gel Cell)
Lead Acid Battery Charger (LM317)
Led Flasher, 2 transistor
Leds Flasher, alternately
Led Strobe Flasher 
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 FM Transmitter #7
Miniature Tracking Transmitter
Mini-Drill variable Powersupply
Missing Pulse Detector (Basic)


Morse Code Practice Keyer, I
Morse Code Practice Keyer, II
Morse Code Practice Keyer, III 
Motor Accu Lader  (Dutch language)
Motorcycle Battery Charger
Motorcycle Brake Light Flasher  TIP117 datasheet
Motorcycle Low Voltage Warning
Motorcycle Headlight Modulator Regulations 
Motorcycle Turn-signal System 
No-Hassle 3rd Brakelight hookup
Police Siren
Power Supply Converted from a PC - by Andy Batts
Practical, 2-wire Intercom
Pulse Timer, 555
Pulse Width modulator, NE555
Pulse Width modulator, CD4093
Pulse Width modulator, LM324
Radio Shack Special - Transmitters by Patrick Cambre
Red Alert Alarm, #1
Red Alert Alarm, #2
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
Subcarrier Adapter Listen to those hidden FM transmissions
ScanMate Your (Radio) scanner buddy
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
A simple solar panel regulator
Solid State Relay
Telephone Transmitter (FM) 
Theremin
Temperature Controled Fan
Temperature Indicator
Thermo Alarm
Thermostat, #2
Thermostat, #3 (NTC)
Thermostat, #4 (1N4148)
Third Brake Light Pulser
Touch Activated Alarm System
Touch Switch using Transistors
Two-Tone Trainhorn 
Universal Flasher Circuit
Universal Lab. Power Supply, Part 1 [2010] "5V/3A, 50V/5A"
Universal Lab. Power Supply, Part 2 [2010] "5V/3A, 50V/5A"
Variable Power Supply, 1 - 30V @ 1.5A 
Wailing Alarm
Warble Alarm
Whooper Alarm, #1   1-20-2010
Whooper Alarm, #2
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)
8A Regulated Power Supply for 13.8V
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

Hobby Kits for your building pleasure

Relays

High-Voltage Projects you can Build

Tutorials

555 Timer/Oscillator
741 Op-Amp
Capacitors
Coils
Crystal Oscillators (SOON)
MosFet Test
Piezo Education/Tutorial
PLL
Resistor Color Code Tutorial
Relays, Relay Drivers, Solid-State
SCR Tester
Toroids
Transistor Tutorial, 12 parts!
Triac Test
UJT Test


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infodata

Stefan's Electronic Projects - Projects and Repairs for Hobbyists, Experimenters, and Aviators.
Testing the Sanyo Eneloop NiMH's - by Stefan Vorkoetter
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 Corp.
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.

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


Questions? Answers? Tips? Please use the Forum: Tony's Forum

International Rectifier     


DISCLAIMER: Sentex Inc. Cambridge ON, ISP 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!

Copyright © 1995, Tony van Roon (VA3AVR). ALL RIGHTS RESERVED.
Last Updated: August 24, 2010