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.
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.
Cheers, MikeMl, thanks for the link, I think this might do it, if I replace the LED with a relay http://www.reuk.co.uk/OtherImages/lm741-voltage-indicator.jpg
Do you know what the resistor values should be to drive a relay with a coil current of 0.15A @ 12v?
Hi, hope one of you guys can help me out.
I need a simple circuit to detect a rise in voltage from about 12.6 vdc to switch on a relay when the voltage reaches about 13.8 vdc.
Its for an automotive project. The rise is the alternator charging voltage.
I would like the relay to stay...
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