SCHEMATIC DIAGRAM FOR
OTHER USEFUL CIRCUITS
Logic Probe with Pulse
Clock Signal Generator CMOS
Clock Signal Generator TTL
Counter by 10-100-1000
Counter, Divided by 128
Data Selector 4 Input
Differentiator
Low Pass Filter
High Pass Filter
Integrator
Multivibrator 1
Multivibrator 2
Oscillator-Square Wave
Voltage Controlled Panner
LED Mood Light
TTL Micro-Spy
Infra-Red Remote Control
Short Wave Bug
ScanMate
DC Motor Control
Push Button Switch Debouncer
Remote Door Bell Indicator
Door Bell with Counter
120VAC Lamp Chaser
12 Volt Lamp Dimmer
Varying Brightness AC Lamp
Alternating On-Off Control
Basic IC Monostable Multivibrator
Basic RF Oscillator
Basic LM3909 IC LED Flasher
Birdie Door Bell Ringer
Clock Generator
Continuity Tester 1
Continuity Tester 2
Two Tone Train Horn
Lantern Flasher / Dimmer
LED Pilot Light AC or DC
Audio LED VU Meter
Trafficator Flasher
Current Sensing Relay Driver
MOSFET Current Sensing
High Bridge Switch for Small Motor
Touch Switch
Light Switch
TV Signal Amplifier
VSWR Bridge with Power Meter
Radio Encoder and Decoder
VHF FM Wireless Microphone 1
VHF FM Wireless Microphone 2
Making your own PCB
Photo Etching PCB
Making Power Transformer
Running Light
Simple Line Mixer
Analogue Pulse Counter
Intercom Pre-Amplifier
Simple Infra-Red Detector
Electronic Attenuator
Geomagnetic Field Detector
Digital Volume Control
Soft Musical Telephone Ringer
Telephone Amplifier
Reverse Bias Oscillator
Seismic Detector
Telephone Line Monitor
Dome Lamp Dimmer
Lightning Detector
Headlight Flasher
Phone Hold w/ Music
Infra-Red Remote Control
In-Circuit Transistor Checker
Hand Clap Electronic Control
Telephone Record Control
Intercom
Signal Tracer
Infra-Red Remote Control
Headlight Flasher
VU Stereo Meter
Computer Interface
Color Organ
Audible Logic Probe
Car Voltage Gauge
Car Temperature Gauge
Tri-Waveform Generator
Phone in Use Indicator
Touch Switch
Motor Speed Control
Strobe Light
Voice Scrambler
Electronic Combination Lock
Auto Burglar Alarm
Audio Auto Shut-off
Bike Light Flasher
Stereo Mixer
Sun-up Alarm
Travel Touch Alarm
Pic Programmer
Pic Light Chaser
Phone Bill Calculator
Plant Moisture Meter
Voice Record/Playback Circuit
Digital Volume Control
Sound Level Meter
Guitar Fuzz Effect
Cut Phone Line Detector
Telephone Recorder
Stepper Motor Controller
7 Segment LED Counter
Time Delay Relay 2
Simple Polarity Tester
Pulsing Third Brake Light
Motor/Light Controller (Dimmer)
Black Light
Continuity Tester
Simple R/C Circuit
Micro-Spy with FET
555 Timer Tester
555 Timer Tutorial and Circuit
Jingle Bell Circuit
Microphone Mixer
Tone Control
Touch Switch
Time Delay Relay
12 Volt Stroboscope
Line Level Signal To Phono Output
Flashing Heart
Video Signal Amplifier
Speech Recorder
HF/VHF PCB VSWR Bridge
Solid State Oscilloscope
FET Audio Mixer
Transistor Organ
Transistorised Relay Driver
Switching Solenoid Driver
Touch Operated Switches
Home
Back on top
AM Radio Circuit
simple Op Amp Radio
Intercom using LM1458
Blown Fuse Indicator
Power Supply Failure Alarm
Electrical Appliances Protection
Low Cost Transistorised Intercom
Digital Volume Control
InfraRed Cordless Headphone
Better Volume (and Balance) Control
CMOS IC Digital Potentiometer
Digital Stereo Potentiometer
Dual-Channel Digital Volume Control
