SCR control buzzer circuit
Source: InternetPublisher:刘德华河北分华 Keywords: SCR buzzer circuit potential Updated: 2021/12/12
Working principle of the circuit: After closing the power switch S, resistor 3 kΩ, and 1.8 kΩ , the potential
at point A is approximately 2.2 V, and the potential at point B is zero. After the host announces the start of answering questions
, if a certain button (assuming S1) is pressed, the corresponding one-way thyristor VS1 will be turned on
and H1 will light up. After VS1 is turned on, the two IN4007 diodes clamp the potential of point B at
about 1.4 V, and the cathode potential of all thyristors is 1.4 V.
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