Triode Dell Tester ---- Transistor Tester

Triode Dell Tester, Transistor Tester Keywords: tester, NE555, CD4027, triode This simple circuit gives me a lot of help, he can test the triode's good or bad, in the circuit, as low as 40 ohms BC or between the resistors, he can check the power output in the amplifier circuit. Sanji. The principle of circuit is as follows: 555 Timer (IC1) Works 12 Hz oscillator, 3 pin output drive 4027 (IC2) dual steady-state circuit. After 2 divided over 14, 15 foot output, the output is connected to LED1 and LED2 through the current limiting resistor R3, and the two LEDs have been arranged, so only one LED is luminated when different polarity triode access circuitry, and when there is no triode connection When you enter, the two LEDs will alternately flash. The 14, 15 foot output passes through the bine of the voltage of the triode by the voltage dividing resistor R4, and when a good triode is accessed, the triode is turned on, and a path to one of the two LEDs, if a good NPN Three-pole access, LED1 will flash, if access is a PNP triode, the LED2 flashes. If access is an open-circuit triode, two LEDs are splashing. If access is a short-circuit triode, both LEDs are not flashing.

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