i want to know the function of the schematic attached and how does it work?
it was in an exam , i can't solve it
it was in an exam , i can't solve it
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Yep...that's what I see too.Hello,
I think it is a power failure monitor.
When the power fails the optocoupler will activate the alarm.
Greetings,
Bertus
The thyristor allows the alarm to stay on even when there is no AC signal input, until it is reset. The momentary switch shorts out the current flow in the thyristor which turns it off if the gate is no longer being driven. EDIT: ignore this, the following post gets it right.i'm confused about the thyristor, when it's on and when it's off