With LED Transistor Tester 1, you can define whether your transistor is a PNP or NPN type and which of the leads is the base. To define Collector and Emitter, you have only two possibilities left now. When the transistor is fine and connected in the right way, the corresponding LED will glow brightly. This circuit tests the ability of a transistor to act as a current amplifier and is very well suited to test small transistors. SW1 switches the polarity, SW2 activates the test.
Combining the two testers in one circuit can save you a switch.
Parts List
Unless otherwise stated, resistor wattage = 0.25W.
- R1 = 10KΩ
- R2 = 470Ω
- D1, D2 = LED
- SW1 = DPDT (double pole, double throw)
- SW2 = momentary,
normally open
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