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How the Circuits are Indexed
This index is arranged alphabetically on each keyword. For example, the "Frost Alarm" will be indexed under "F" and also "A". The A - Z menu above will scroll to all circuits starting with that letter. The icon will return you to the A - Z menu. You can also use your browsers search function; this is "Ctrl + F" on most browsers.
A
Alarm Circuits
Alarm PSU
AM Modulator
AM Transmitter Circuit
AM Receiver
Add-On Current Limiter
Asymetrical Timer
ATL3 Loop Antenna
Antenna Tuning Unit
Audio Bargraph Display
Audio Circuits
Audio Indicator
Audio Level Meter
Audio Notch Filter
Audio Preamplifier
Audio Security Monitor
Audio Voice-Over Circuit
Audio VU Meter
Automatic Intruder Alarm
Automatic Repeater
A Collection of Mini-Alarms
Bench Amplifier
Buffer Amplifier
Class A//A-B Amplifier
CMOS Single Zone Alarm
Cold Activated Switch
Enhanced Alarm Keypad
Frost Alarm
Gate Alarm
Op-Amp Microphone Preamplifier
Headphone Amplifier
Miniature Loop Alarm
Modular Burglar Alarm
Motorcycle Alarm
Motorcycle Alarm 2
Motorcycle Alarm 3
Motorcycle Alarm 4
Motorcycle Alarms 5 & 6
MW Active Antenna
Output Adjustable Flyback Converter
Peak Reading Audio Level Meter
Q-Multiplying Loop Antenna
Quadraphonic Amplifier
Radio Wave Alarm
Snore Alarm
SCR Based Burglar Alarm
Soft Switching Amplifier with Tone Controls
TDA 2030 Amplifier
Vinyl Amplifier
Water Activated Alarm
ZN414 Portable AM Receiver
6 x 6 Antenna Loop
200mW Amplifier
2 Watt Amplifier
2 Watt Amplifier by Carlos Feldman
5 Watt Amplifier
15 Watt Amplifier
24 Watt Class A Amplifier
25 Watt Amplifier
30 Watt VHF Amplifier
32 Watt Amplifier
150 Watt MP3 Car Amplifier
2 Zone Alarm
3 Zone Duress Alarm
5 Zone Alarm
6 Zone Alarm

B
Baby Alarm
Band 2 VHF Amplifier
Beat Balance Metal Detector
Bench Amplifier
Bipolar Regenerative Receiver
Boosting Regulator Current
Buffer Amplifier
Buzzer Circuit
Audio Bargraph Display
DC Push Button Motor Control
Decimal to BCD Convertor
Fuse Blown Indicator
Modular Burglar Alarm
Nicad Battery Charger
Solar Battery Charger
An SCR Based Burglar Alarm
4 Band Double Tuned Preselector

C
Cable Tester
Camera Switcher
Car Alarm and Immobilizer
Class A//A-B Amplifier
CMOS Single Zone Alarm
Coil Coupled Operation Metal Detector
Cold Activated Switch
Collection of Mini-Alarms
Combinational Conjuring Trick
Conjuring Trick
Connection Tester
Control and Interfacing
Computer Microphone
Crystal Controlled Oscillator by Ramon Vargas
Crystal Test Circuits
Current Limiting Power Supply
Add-On Current Limiter
Boosting Regulator Current
Digital Combination Lock
Doorbell with Counter
Electric Curtains
Electronic Canary
Fan Controller
Infra Red remote control extender
Infra Red Remote Control Extender Mark 2 Version
Infra Red remote control tester
Light Detection Circuit
Loudness Control
Nicad Battery Charger
Output Adjustable Flyback Converter
Power Control Circuits
PWM Motor Controller
Quartz Crystal Test Circuits
Quiz Circuit
Tone Controls
Voltage Comparator Switch
Voltage Controlled Switch
24 Second Shot Clock
50Hz Calibration Aid
24 Watt Class A Amplifier
150 Watt MP3 Car Amplifier

D
Dark Activated Switch
DC Motor Reversing Circuit
DC Push Button Motor Control
Decimal to BCD Convertor
Digital Circuits
Digital Combination Lock
Doorbell for the Deaf
Doorbell with Counter
Doorphone Intercom
Dual Regulated PSU
Dynamic Microphone Preamplifier
Audio Bargraph Display
Audio Line Driver
Metal Detector
Electromagnetic Field Detector
Electronic Door Release
Light Detection Circuit
Modulation Detector for IR Remote Controls
Negative Ion Detector
Neon Desklamp
Remote Doorbell Indicator
Stereo Line Driver
Surveillance Transmitter Detector
Switch Debouncer
Universal 4 Digit Keypad Operated Switch
Zener Diode Tester
4 Band Double Tuned Preselector
3 Digit Display Scoreboard
3 Zone Duress Alarm

E
ECM Mic Preamplifier
Electric Curtains
Electronic Canary
Electronic Door Release
Electromagnetic Field Detector
Electronic Mousetrap
Electronic Siren
Electronic Switch
EMF Probe with Meter
EMI Mains Filter
Enhanced Alarm Keypad
Electronic Metronome
Infra Red remote control extender
Infra Red Remote Control Extender Mark 2 Version
Music and Special Effects
Sound Effects Generator

F
Fan Controller
Fast Electronic Fuse
Field Strength Meter
FM Receiver using MPF102
FM Transmitter
FM Transmitter 2
Frost Alarm
Function Generator
Fuse Blown Indicator
Audio Notch Filter
Electromagnetic Field Detector
Long Range FM Transmitter
Output Adjustable Flyback Converter
Power Failure Alarm
Power Fail Alert
Simple Field Strength Meter
Solar Flasher
Stereo FM Transmitter
2 Transistor FM Transmitter

G
Gate Alarm
GEM 100 Watt Amplifier
Guitar Preamp
Guitar Preamp with Tone Controls
Gyrator Circuit
Function Generator
Sound Effects Generator

H
Headphone Amplifier
Hi-Fi Preamplifier
HiJack Alarm
High Quality Intercom
Hot Water Indicator
Passive Ethernet Hub

I
Increasing Regulator Current
Infra Red Link
Infra Red remote control extender Mark 1
Infra Red Remote Control Extender Mark 2
Infra Red Remote Control Extender Mark 3
Infra Red Remote Control Extender mark 4
Infra Red Remote Extender Mark 4A
Infra Red Remote Control Extender Mark 5
Infra Red remote control tester
Infra Red Switch
Interfacing Circuits
Internet Streaming Recording Aid
Interval Timer No. 7
Interval Timer No. 8
Insect Repellant
Audio Indicator
Car Alarm and Immobilizer
Control and Interfacing
Doorphone Intercom
Fuse Blown Indicator
High Quality Intercom
Hot Water Indicator
Negative Ion Detector
Remote Doorbell Indicator
Signal Injector and Tracer
6 Input Mixer

J


K
Keypad Circuit
Keypad Combination Lock
Keypad Operated Switch 2
Enhanced Alarm Keypad
Universal 4 Digit Keypad Operated Switch

L
Laser Communication System
LED Flasher
LED flasher 2
LED Torch
LED Torch 2
Light Detection Circuit
LM317 Voltage Regulator
Logic PSU with Over Voltage Protection
Logic Probe
Long Range FM Transmitter
Loudness Control
Low Voltage Preamp
L200 PSU
Add-On Current Limiter
ATL3 Loop Antenna
Current Limiting Power Supply
Keypad Combination Lock
Miniature Loop Alarm
Model Rocket Lauch Controller
Night Light
Peak Reading Audio Level Meter
Q-Multiplying Loop Antenna
Sound Level Meter
Stereo Line Driver
Triac Light Controller
Water Level Alarm
6 x 6 Antenna Loop

M
Magic Wand
Metal Detector
MicroController Circuits
Milligauss Meter
Miniature Loop Alarm
Miscellaneous Circuits
MK484 Complete Receiver
Model Rocket Lauch Controller
Modular Burglar Alarm
Modulation Detector for IR Remote Controls
Monitor Splitter
Motorcycle Alarm
Motorcycle Alarm 2
Motorcycle Alarm 3
Motorcycle Alarm 4
Motorcycle Alarms 5 & 6
MSF Receiver
Multi Rocket Launcher
Multiple Output DC Converter
Music and Special Effects
MW Active Antenna
Audio Security Monitor
Beat Balance Metal Detector
Coil Coupled Operation Metal Detector
Collection of Mini-Alarms
Computer Microphone
DC Push Button Motor Control
DC Motor Reversing Circuit
Digital Combination Lock
Dynamic Microphone Preamplifier
ECM Mic Preamplifier
Electronic Metronome
Electronic Mousetrap
EMF Probe with Meter
EMI Mains Filter
Field Strength Meter
Op-Amp Microphone Preamplifier
Peak Reading Audio Level Meter
PWM Motor Controller
Q-Multiplying Loop Antenna
Room Monitor
Simple Field Strength Meter
Speaker Microphone
Temperature Monitor
6 Input Mixer
150 Watt MP3 Car Amplifier
555 Monostable Circuit

N
Negative Ion Detector
Negative Voltage Load Switch
Neon Desklamp
Nicad Battery Charger
Night Light
Audio Notch Filter

O
Op-Amp Microphone Preamplifier
Output Adjustable Flyback Converter
Over Voltage Protection for LM317
Crystal Controlled Oscillator by Ramon Vargas
Keypad Operated Switch 2
Logic PSU with Over Voltage Protection
Multiple Output DC Converter
Sound Operated Switch
Square Wave Oscillator
Universal 4 Digit Keypad Operated Switch

P
Passive Ethernet Hub
PC Scope Probe
Peak Reading Audio Level Meter
Periodic Timer
Perimeter Alarm
Porch Light Switch
Pot Plant Power
Power Control Circuits
Power Failure Alarm
Power Fail Alert
Privacy Circuit
Pulse generator
PWM Motor Controller
Audio Preamplifier
Current Limiting Power Supply
DC Push Button Motor Control
Dual Regulated PSU
Dynamic Microphone Preamplifier
ECM Mic Preamplifier
EMF Probe with Meter
Guitar Preamp
Hi-Fi Preamplifier
Logic Probe
Logic PSU with Over Voltage Protection
Low Voltage Preamp
L200 PSU
MW Active Antenna
Op-Amp Microphone Preamplifier
RF Probe
Soft Start Power Supply
UHF Preamplier
Uninterruptable Power Supply
Unregulated PSU
ZN414 Portable AM Receiver
4 Band Double Tuned Preselector
1.3V Power source
9V 2A PSU
12V 30A PSU
13.8V 20A PSU
37 Volt 30 Amp PSU

Q
Quadraphonic Amplifier
Quartz Crystal Test Circuits
Quiz Circuit
Q-Multiplying Loop Antenna
High Quality Intercom

R
R5000 Interface
Radar Detector
Radio Wave Alarm
Regulated 12v PSU
Remote Doorbell Indicator
RF Circuits
RF Probe
Room Monitor
Running Lights with Up Down Counter
AM Receiver
Automatic Repeater
Bipolar Regenerative Receiver
Boosting Regulator Current
DC Motor Reversing Circuit
Dual Regulated PSU
Electronic Door Release
FM Receiver using MPF102
Infra Red remote control extender
Infra Red Remote Control Extender Mark 2 Version
Infra Red remote control tester
Internet Recording Streaming Aid by Rodney Byne
Long Range FM Transmitter
MK484 Complete Receiver
Model Rocket Lauch Controller
MSF Receiver
ZN414 Portable AM Receiver
ZN414 SW Receiver
Variable Voltage Regulator

S
Schematics
Short Wave Regenerative Receiver
Signal Injector and Tracer
Simple Field Strength Meter
Sine Wave Generator
Small Variable Power Supply
Snore Alarm
Soft Start Power Supply
Solar Battery Charger
Solar Flasher
Sound Effects Generator
Sound Effects Generator 2
Sound Level Meter
Sound of Light Circuit
Stereo FM Transmitter
Stereo Line Driver
Supply Voltage Indicator
Surveillance Transmitter Detector
Switch Debouncer
Camera Switcher
Cold Activated Switch
Dark Activated Switch
Electronic Siren
Field Strength Meter
Music and Special Effects
PC Scope Probe
Uninterruptable Power Supply
Universal 4 Digit Keypad Operated Switch
Voltage Comparator Switch
Voltage Controlled Switch
ZN414 SW Receiver
24 Second Shot Clock

T
TDA 2030 Amplifier
Telephone in Use monitor
Temperature Monitor
Test Gear Circuits
Timing Circuits
Toggle Switch Number 1
Toggle Switch Number 2
Toggle Switch Number 3
Tone Controls
Tracking Transmitter
Triac Light Controller
TV Transmitter
Conjuring Trick
FM Transmitter
Infra Red remote control tester
LED Torch
AM Transmitter Circuit
Antenna Tuning Unit
Cable Tester
Connection Tester
Asymetrical Timer
Interval Timer No. 7
Interval Timer No. 8
Long Range FM Transmitter
Periodic Timer
Quartz Crystal Test Circuits
Stereo FM Transmitter
Soft Switching Amplifier with Tone Controls
Surveillance Transmitter Detector
Zener Diode Tester
2 Transistor FM Transmitter
2 Transistor Transmitter
1 Hour Timer
24 Hour Timer
4 Band Double Tuned Preselector
4 Transistor Transmitter
5 to 30 Minute Timer

U
UHF Preamplier
Ultrasonic Dog Whistle
Under Voltage Circuit
Uninterruptable Power Supply
Universal DC-DC Convertor
Universal PSU
Unregulated PSU
Antenna Tuning Unit

V
Variable PSU
Variable PSU 2
Variable Voltage Regulator
Vinyl Amplifier
Voice-Over Circuit
Voltage Comparator Switch
Voltage Controlled Switch
Voltage Controlled Switch using 555
VOX Circuit
Audio Voice-Over Circuit
Band 2 VHF Amplifier
Logic PSU with Over Voltage Protection
Low Voltage Preamp
Negative Voltage Load Switch
Small Variable Power Supply
Supply Voltage Indicator
Under Voltage Circuit
30 Watt VHF Amplifier

W
Wart Zapper
Water Activated Alarm
Water Activated Relay
Water Level Alarm
Wien Bridge Oscillator
Hot Water Indicator
Magic Wand
Radio Wave Alarm
Short Wave Regenerative Receiver
Square Wave Oscillator
Ultrasonic Dog Whistle
2 Watt Amplifier
5 Watt Amplifier
25 Watt Amplifier
30 Watt VHF Amplifier

X

Y

Z
Zener Diode Tester
ZN414 Portable AM Receiver
ZN414 SW Receiver
2 Zone Alarm
3 Zone Duress Alarm
5 Zone Alarm
6 Zone Alarm
CMOS Single Zone Alarm
Wart Zapper

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