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rollcast
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I have tested this circuit on the computer and it works but when I try to make it both on a pcb and breadboard the circuit will not work at all. If i swap the thyristor - TIC106D - for a transistor - TIP121 - the circuit works fine so I think the problem can be isolated down to somewhere between the Op Amp output and the thyristor?
The other unusual thing is that if I short the Cathode pin to the Gate or the Anode pin to the gate, then the buzzer will sound but the thyristor doesn't latch?
Any ideas what is causing the fault.
Thanks
AL
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