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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I see the point with the time delay circuit but Fletcher also wanted the circuit to first detect 5 volts and then delay the turn on time of the relay. I think a comparator voltage level detector would come in handy here. It appears the delay circuit would also require some means of initializing the delay when the 5 volt level is detected.
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