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I would like to make a compact and simple circuit which either turns a small LED on or off at 0.7v. It's for a single AA electric toothbrush as a battery change indicator and would get power only when the brush is on. Because the motor slows gradually, I can't easily tell when it's time to change batteries due to the sound. Thank you.
My wife could certainly use this. I would certainly purchase a kit if I could. Please advise when one is available.