Use NE555 to make diode, triode detector ----- NE555 Transistor Detector

Making diode, triode detector, NE555 Transistor Detector Keywords: Diode, triode detector with NE555 Making diode, triode detector with NE555 Author: Wang Xiaopeng This circuit can detect the PN junction (PNP, NPN) to determine whether the pipe is good, easy to detect, simple and practical. 555 integrated circuits and R1, R2, C1, etc. form an uncondensed multi-resmicable, whose oscillation frequency is f = 1.44 / (R1 + 2R2) C1 corresponding to the corresponding pole of the crystal triode to be tested. In B, the C poles (if the diode is inserted into the E, C two holes). If the tube is a PNP type, it is good, it can only provide a conduction path for the PNP tube while 555 output oscillation square wave, which is turned on, ie, when the square wave is low, and the LED 2 is luminescented in series. Tube is electroluminescence; when the oscillation square wave is high, the PNP tube is closed, LED1, and LED2 do not emit light. If the transistor is the NPN type, the pipe is operated and turned on, it is opposite to the PNP tube described above. If it is a good tube, the UED1 lights light, and the LED2 is not bright. Therefore, the luminescence of LED1 or LED2 can be determined that NPN is NPN, or PNP and it is good. For the triodes, LED1 and LED2 that are damaged, it does not shine; for the triodes that are broken down from C, E poles, the low level will be turned on at the oscillation square wave, just because the vision of human eye The role, it looks bright. Therefore, when the triode is detected, both of the LED1, LED2 is on or out, indicating that the triode is damaged. For diodes, including silicon tubes or tubes, it is the same triode, but only the E hole and C are inserted when the insertion feet.

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