Circuits for the Hobbyist by LERSKI

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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 Precison Power Supply, 0-40V/2A  Birdie Doorbell Ringer Broadcast-Band RF Amplifier Bug Detector with Beep Bug Detector 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) 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 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 Simple Solar Regulator 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 Solar Cell Regulator A simple solar panel regulator Solar Panel Sun Tracker 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 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 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 555 Timer/Oscillator 741 Op-Amp Capacitors Light Emitting Diodes  Diodes & Diodes Data  Photosensitive Devices   7-Segment Displays  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

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


Power Jack 3500Watt Inverter - The nightmare for customers done by incompetent Taiwan "engineers". Buyers beware!
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.
Cambridge Amateur Radio Club - CARC Homepage.
Other Interesting Links - Links to other interesting and informative Electronics Websites

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555 Timer/Oscillator  741 Op-Amp  Capacitors  Light Emitting Diodes   Diodes & Diodes Data   Photosensitive Devices   7-Segment Displays   Converting Frequency to Channel #'s  MosFet Test  Piezo Education/Tutorial  Phase Locked Loop   Resistor Color Code  SCR Test  Transistor Tutorial, 12 Parts!  Triac Test  UJT Test  Coils  Toroids RF/EMI  Make Your Own Shunts  Relays, Relay Drivers, Solid-State  555 Timer Tester - Test those 555's in your junkbox  555 Go-No/Go Tester - 555 tester, more advanced  7.2Volt Cycler - 7.2V NiCad packs  7.2V Field Charger (.pdf file)  Airtronics AM/FM - Trainer Cord  Automatic Device Locator - Beacon  Auto Pilot for R/C - Commercial device  9-V Nicad Charger - From the Netherlands  Back and Forth Flasher - Forrest Mims III  Battery Backup (1) - For Large Aircraft  Battery Backup (2) - A better type  Battery Cycler - For Rx/Tx NiCads   BEC Speed Controller - Stefan's Website  Car NiCad Charger - Using car battery  Charger - Constant Current Charger  Crashed Plane Locator - Beacon  DCS 400 Multipurpose Connector  Discharger - NiCad discharger  Elevon Mixer - by Malcolm Aldred  Futaba-AM - Trainer Cord  Futaba-FM - Trainer Cord  Futaba to JR - Trainer Cord  Futaba (AM) to Futaba (FM) - Trainer Cord  FlyWire (Deans Ant.) - For Helicopter  Glowplug Driver - Project for your Flightbox (1)  Glowplug Panel - Project for your Flightbox (2)  Hotchek - Hotcheck (.pdf - See note 1)  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  Link  Hot Wire Foam Cutter, 7 - by Rocket Team Vatsaas  Hot Wire Foam Cutter, 8 - by Daniel Hartman  Hot-Wire Foam Cutter, 10 - by Tony van Roon  IRF-511 FET - TMOS FET Data Sheet

JR-FM - JR Trainer Cord  Lead Acid Charger, 1 - For Gel-Cell Batteries  Lead-Acid Charger, 2 - Battery Charger  Lead-Acid Charger, 3 - Charger with 'Float' Mini-Drill P.S. - Variable speed for your mini-drill Modifying a Servo - Modifying for indefinate rotation  Model Rocket Launcher - Time delayed  Model Rocket Launch Controller - Matthew Hewson  Model Rocket Timer - The half-ounce one  Model Rocket Strobe - Xenon Flash Tube  Model Rocket Parachute - Delayed  Model Rocket Altimeter - PIC Based  Model Train Lights - Head Lights for Model Trains  Model Train Horn, 2-tone - Dual Tone  Sound    Model Train Website - Excellent site by R. Paisley  NiCad Sensor - NiCad Voltage Monitor for Rx  Night Blades - Helicopter night-blades  Noise Trap - For long servo leads  Added schematic  PCM/PPM Locator & Voltage Watch - by M.J. Pawlowsky  Power Panel - Combine it with the Glowplug Driver  Proportional Radio Control  R/C Digital Camera Controller  R/C Emergency Locator Alarm - by Jon Fick Code/Description  More PIC codes and articles - by Jon Fick  R/C Helicopter Camera  R/C Pilot  PCB & Layout 11-04-2006  R/C Switch 2 - For driving accessories   R/C Switch 3 - Similar, but with 4001  R/C Timer Switch - Adjustable, 20-80 seconds  R/C Switch 4 - Modified to use Infra-red cameras  R/C Switch 5 - Electric Motor Switch   Receiver Regulator - Rx Down-converter to 5V.  RX-Volt - Dot/Bar Rx Voltmeter.  Simple Charger - With 'Peak-Detect'  Simple Constant Current Source - by John Nooyen  Sequencial Led Flasher  Servo Driver #1  Servo Driver #2  Servo Driver #3  Servo Driver #4  Servo Modification  Servo Driver/Fuel Mix calculator - by Andy Batts  Servo Driver using PIC  Servo Modification - For contineous rotation  Solar Charging - NiCad Charger  Toy Car Tx/Rx 27MHz - plus 49Mhz  Stop-signal Override for Model Railways  Tail Nav Light - For Heli or Aircraft  Variable Power Supply - 1 to 30V/1.5A   Wingtip Nav Lights - Like the real thing  ZAP Adapter - Rejuvenate 'dead' NiCads.  Electronic Symbols Template Hobby Kits for your building pleasure Gadgets for Radio Control "Green" means on-line, "Red" means off-line Bookmark this valuable page with 'Ctrl-D'.

Note 1: The "HotCheck" pdf file belongs to Brent's website but it appears to be off-line for a long time. Here is Brent's pdf file for your building pleasure until I can figure out what's up with his website.

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
 My Circuits Page - More interesting circuits can be found here.
 Radio Shack Partnumbers - For the most common parts
  Resistor Value Calculator - By Danny Goodman, AE9F
 Data Sheet - Pin-outs for a variety of other components
 TUP/TUN/DUS/DUG - Elektor/Elektuur's Substitute system
 Toroids, RF/EMI Cores - Variety of commonly used toroids, colors, etc.
 Zapping NiCads/Lithium-Ion batteries - Getting the most from your batteries
 LM301A - High Performance OP-AMP
 LM334 - Three Terminal Adjustable Current Source
 LM3914 - Dot/Bar Display Driver Data Sheet
 MC1455 Timer IC - CMOS Timer/Oscillator (CMOS) Data Sheet
 MC14001 - Quad 2-input NOR Data Sheet
 MC14013B - Dual Type D Flip-Flop Data Sheet
 MC3456/MC3556 Timer IC - CMOS Dual Timer/Oscillator Data Sheet
 MC14069UB - CMOS Hex Inverter Data Sheet
 MC14093B Schmitt Trigger - Quad 2-input NAND Schmitt Trigger Data Sheet
 NE555 Timer IC - Timer/Oscillator Data Sheet
 NE556 Timer IC - Dual Timer/Oscillator Data Sheet
 PN100/200 - Data Sheets for the PN100 and PN200
 LF13741 JFet OpAmp - Monolitic JFET Input OpAmp Data Sheet
 Thomas Scherrer's (OZ2CPU) Website - Glowplug driver mod's, UHF downlink, and more!
 Brent's R/C Electronic Page - Optoglow, Reverser, Go-slow, HotChek.
 Dave's R/C Circuits - Couple very good circuits
 Johann Aichinger R/C Electronics Page - Excellent site, damn all those bloody pop-ups
 Model Railroad Electronics from Rutger - Flasher, crossing, etc.
 Stefan's Electric R/C Website - Miniature Speed Controllers, and more!
 Sirius Datasheets - for jumpering the charging diode in transmitters
Other Interesting Links - Links to other interesting and informative Electronics Websites

"Red" ball means LINK is off-line

Bookmark this valuable page with 'Ctrl-D'.

For all your Questions, Please use the Forum:  Forum