Ive got a system which switches 240v when on and 68v when off. I need to shut the voltage off in it's "off" state. I was thinking of bridge, smooth, potential divide then using this lower dc voltage as a threshold switching voltage. now I was thinking of using something like UJT or a BJT to switch a relay to disconnect the supply.
My analogue electronics is a bit rusty, can anyone comment or give a better solution to this problem.
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