Inductive meter adapter
Inductive meter adapter circuit

12V Lead-Acid Battery Monitor
12V Lead-Acid Battery Monitor circuit

1GHz Simple Frequency Counter
1GHz Simple Frequency Counter circuit

A simple Remote control Tester
A simple Remote control Tester circuit

AC Line Current Detector
AC Line Current Detector circuit

Audio level meter (vumeter)
Audio level meter (vumeter) circuit

Beeper to find short circuits
Beeper to find short circuits circuit

Capacitance Meter
Capacitance Meter circuit

Car Water Temperature
Car Water Temperature circuit

Contactless Mains Voltage Indicator
Contactless Mains Voltage Indicator circuit

Continuity Tester
Continuity Tester circuit

Crystal Tester
Crystal Tester circuit

Decibel Meter
Decibel Meter circuit

Digital Voltmeter
Digital Voltmeter circuit

Digital Voltmeter
Digital Voltmeter circuit

Electronic Thermostat and Relay Circuit
Electronic Thermostat and Relay Circuit circuit

Frequency Comparator
Frequency Comparator circuit

Function Generator
Function Generator circuit

High Resistance Voltmeter
High Resistance Voltmeter circuit

IR Remote Control Tester
IR Remote Control Tester circuit

Latching Continuity Tester
Latching Continuity Tester circuit

Led display digital Voltmeter
Led display digital Voltmeter circuit

Linear Resistance Meter
Linear Resistance Meter circuit

Mosfet TESTER
Mosfet TESTER circuit

Oscilloscope testing module (huntron circuit)
Oscilloscope testing module (huntron circuit) circuit

Picoammeter circuit with 4 ranges
Picoammeter circuit with 4 ranges circuit

Thermostat for 1KW Space Heater (SCR controlled)
Thermostat for 1KW Space Heater (SCR controlled) circuit

Transistor Tester
Transistor Tester circuit

Triangle / Squarewave Generator
Triangle / Squarewave Generator circuit

Voltage follower with 1G ohm input resistance
Voltage follower with 1G ohm input resistance circuit

Voltage Monitor
Voltage Monitor circuit

XTal Tester
XTal Tester circuit

XTal Tester
XTal Tester circuit

Zener Diode Tester
Zener Diode Tester circuit