https://www.mikrocontroller.net/articles/AVR-Transistortester
GM238 User Manual -PDF (local)
GM328 DIY Kits Features: -Digital LCD display for easy readings, can display measured data and graphics -Rotary switch control, a key measurement for convenient use -Main chip is the DIP, easy for electronic enthusiasts to DIY or update the main chip -Use 9V battery(not included), can also use DC power(DC 6.8-12V) -Automatic shutdown, shutdown current is only about 20nA -Automatically detects NPN and PNP transistors, FET, diodes, dual diode, thyristor, SCR,automatic identification of the transistor pinout. -Test NPN and PNP transistor common-emitter current amplification factor, the base-emitter threshold voltage, off the collector - emitter leakage current. -Support 2 resistors measurement, show its positive and negative, on-state voltage. -Resistance measurement maximum resolution 0.01Ω, can be measured up to 50MΩ. -Automatically test the pins of a component and show on the display. -Measure FET gate threshold voltage and gate capacitance. -For the following 2100Ω resistor while measuring its inductance measuring range from 0.01mH - 20H. -Can be used as signal generator and frequency meter: frequency range from 1Hz-2MHz and can generate 1%-99% PWM(pulse width modulation) signals Specification: Display: 160*128 LCD Power Supply :1 * 9V Battery(not included); DC 6.8-12V Current Approx. 30mA Resistance Measurement Max. 50MΩ Resistance Resolution 0.01Ω Capacitance Measurement 25pF~100mF Capacitance Resolution 1pF DC Voltage Measurement Up to 50V Screen Size Approx. 3.7 * 3cm / 1.45 * 1.18in PCB Size Approx. 7.8 * 6.2cm / 3.1 * 2.44in With optional Clear Case Cover: Dimensions: approx.83 x 83 x 30 mm
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Other References
Instructables Writeup:http://www.instructables.com/id/AVR-Transistor-Tester/
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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20180615 - pre published v0.9