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.
Hi, see the attached, the pot is 100K if you want a led lit when bat ok keep top led and resistor and remove the bottom, if you want the led lit when bat below set point remove top led and resistor.
The zenor should be as close to half the voltage you wnat to monitor.
Unlike the above suggestion, it wont work below 3-4v
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