This LED DC voltage indicator circuit is a voltmeter, rather than simply a battery tester. As such it may measure voltages as low as 3V. It utilizes venerable LM741 operational amplifiers applied as ...
This circuit is not a novelty, but it proved so useful, simple and cheap that it is worth building. When the positive (Red) probe is connected to a DC positive voltage and the Black probe to the ...
These medium-voltage indicators flash with enough illumination to allow safe viewing from outside the enclosure through an access window These medium-voltage indicators flash with enough illumination ...
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