Unijunction Transistor (UJT) Work Performance Quick Test Circuit Diagram

Published:2011/6/18 10:21:00 Author:Vicky | Keyword: Unijunction Transistor (UJT) Performance Quick Test | From:SeekIC

The above picture is a circuit of unijunction transistor (UJT) work performance quick test .The tested unijunction transistor (UJT) VBT (suppose: BT33) constitutes relaxation oscillator together with R3 and C2. When the VBT is on, triode VT1 acquires bias current via bias resistance R2 (S1 is broke and S2 is closed up in the moment), and the luminous diode H1 gives out light. +10V power supply charges C2 via VD2 by R3. Voltmeter V can detect that the voltage of two ends of C2 would goes up continuously. When the electric potential of E end reaches the peak voltage, part from E to B1 of VBT would automatically breakover and the voltage of capacitance C1 would discharge via part from E to B1, both of which leads to emitter junction of triode VT1 ends because of back bias.



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