Schematics
Power Amplifier
Preamplifier
Audio mixer
Audio Equalizer
DC Protection
Headphone Amplifier
Vu Meter
Tube amplifier
Loudspeakers Active crossover
Audio Filter
Audio misc
Auto - car
FM transmitter
LED
Alarm
Power Supply
Motor control
Robot
Timer generator oscilator
Computer
Microcontroller programmer PIC AT
Digital
Light controller
Laser
RF transmitter receiver
IR infrared
Medicine
Meter Tester
Video
Switch control
Solar
RC modeling
Musical instruments
Miscellaneous
Game
Data acquisition
Telephone
220V live Wire-in-Wall scanner
Alarms & Security Circuits
Beat Balance Metal Detector
BFO Metal Detector
Capacitive sensor
Coil Coupled Operation Metal Detector
Compass 77b metal detectors
Compass Sensor
Detector sense vibration
Doorknob Proximity Alarm
DTMF Proximity Detector
Dual Comparator temperature-compensated proximity
Dual Comparators Stabilize Proximity Detector:
Electromagnetic Field Detector
Electromagnetic field probe with meter detect audio and RF signals up to frequencies of around 100kHz
Fisher 1212X metal detectors
Fridge door alarm
Gardiner 202A metal detectors
Heathkit Cointrack GD-1190 metal detectors
Heathkit Groundtrack GD-1290 produced metal detectors
Humidity sensor 2322 691 90001
Inclinometer tilt-measuring circuit
Infra-Red (IR) Beam Alarm/ Proximity Detector Infrared beam barrier
Infrared Level Detector for Liquid Level Detection and Proximity Detection
Invisible Broken Wire Detector
Ionising Smoke Detector
Jetco Treasure Hawk metal detectors
Little Door Guard
Magnetic proximity sensors
Magnetic Proximity Switch
Mercury switch filter
Metal detector
Metal Detector Electronic Circuit
Metal detector Mk1
Metal detector Mk2
Metal Detector uses Single IC)
Motor control sensor feedback circuits
Optical Proximity Detector
Oxygen sensors
Precision Digital Altimeter Pressure Sensor circuit
Pressure Sensor
Proximity Alarm #2
Proximity Alarm #3
Proximity inductive switch
RF/capacitance level instrumentation measuring admittance of an alternating current (ac) circuit that varies with level
Ridiculously sensitive charge detector
RS-232C Link Monitors Animal Activity
Simple BFO metal detector
Simple metal detector Electronic circuit
Touch plate
Two-component metal detector
Use your printer port as a high-current ammeter
Vibration Detector
Voltage-Based Controller For Switches
Wheel encoders
White's Goldmaster 66 metal detectors
