Voltage-Regulator Diode Performance Quick Test Circuit Diagram

Published:2011/6/26 6:12:00 Author:Vicky | Keyword: Voltage-Regulator Diode Performance Quick Test | From:SeekIC

As shown in the picture, VT1 & VT2 etc constitute astable free-running multivibrator and the vibrator’s frequency is determined by C1, R2,R3, C2 etc. The cycle of the vibrator is about 4 seconds. VT2 gives out high level, the level then is transformed by VD, and VT3 is conducted, meanwhile the current is limited by luminous diode H1 and resistance R6, and finally it triggers bidirectional diode thyristor. A good thyristor is immediately conducted, and luminous diode H2 gives out light; when VT2 gives lout low level, VD, VT3, VS all end and H2 is lightless. If H1 and H2 shines synchronously , the thyristor is good; if H1 shines while H2 is extinct, then VS suffers internal short-circuit; if H2 remains luminous all the time, then VS suffers internal breakdown; if both H1 and H2 don’t shine, then VT1 and VT2 circuit don’t vibrate.



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