??Multi-functional transistor tester for automatic detection of NPN and PNP transistors£¬ N-channel and P-channel MOSFET£¬ diodes£¬ thyristors£¬ resistors£¬ capacitors or other devices. Also can be used as frequency meter or square signal and PWM signal generator.

Features:
Digital 12864 LCD display£¬ easy to read.
Can be powered by 9V battery(not included).
Automatically detect NPN and PNP transistors£¬ N-channel and P-channel MOSFET£¬ JFETs£¬ diodes£¬ inductors£¬ resistors£¬ capacitors£¬ thyristors or other devices.
Support 2 resistors measurement£¬ also support potentiometer measurement.
Automatically test the pins of a component and show on the display.
Measure the gate threshold voltage and gate capacitance of the MOSFET.
Measure bipolar transistor current amplification factor and base-emitter threshold voltage.
Short detection time: only 2 seconds. It costs more time for bulk capacitor detection.
Can be used as signal generator and frequency meter. Different built-in square signals from 1Hz-2Mhz are available to choose. It can generate 1-99% PWM(pulse width modulation) signals.

How to use:
1. Resistor welding. If you are not familiar with the chromatic circles£¬ please check the resistance with a multimeter.
2. Other components welding. Please make sure the transistor type and direction are correct.
3. Connect with power supply(9V battery or 5.5V-12V external DC power supply) instead of connecting with M328 and the LCD. Then measure the voltage between pin 7 and pin 22 with a multimeter. If the voltage is +5V£¬ it means the meter is working in normal condition.
4. Cut off the power supply£¬ connect with M328 and the LCD. When all installation finished£¬ connect with the power supply.
5. Detailed installation guide: https://www.dropbox.com/sh/uo7nr7xet09esbu/AAAMAjU0sE2hFqCXe0VAsGM_a?dl=0

Note:
The testing picture is just for reference£¬ please in kind prevail!

Specifications:
Display: 12864
Voltage: DC5.5-12V
Current: 24mA
Power Supply: 9V Battery(not included)
Resistance Measurement: Max.50M¦¸
Resistance Resolution: 0.1¦¸
Capacitance Measurement: 25pF~100mF
Capacitance Resolution: 1pF
Inductance Measurement: 0.01MH~20H
Screen Size: 5 * 3.5cm / 2 * 1.4in
PCB Size: 7.5 * 6cm / 3 * 2.4in
Package Size: 9.5 * 9.5 * 3.5cm / 3.7 * 3.7 * 1.4in
Package Weight: 81g / 2.8oz

Package List:
1 * Transistor Tester DIY Kit