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trek988 asked How would I add LED lights to a timer?
I have a kitchen timer and I'm wanting to add a few LED lights to it so I that if I can't hear it go off I can see it. I think I understand how to wire into the timer, but what I'm not sure of is how to power the lights. The timer is run off of a little watch battery which I figure isn't going to be powerful enough to run the lights. Is there a such thing as a micro relay I can add to allow another power source to power the lights?
And got the following answer:
The typical battery operated timer will only have a buzzer output. Usually a Piezo electric but possibly a electromagnetic buzzer. As you suspect you will need to have additional power for the LED or you will drain the timer battery. To activate the indicators you will need to sense the AC or pulsed DC signal to the buzzer and have this activate some kind of latching circuit. The answer I think would be to use a couple of diodes and capacitors to make a voltage multiplier if the timer output it is too low (electromagnetic buzzer) or a resistor and diode clamp if the voltage is too high (piezo buzzer). Then feed this signal into the RESET input of a CMOS RS-Flip-Flop IC (CD4043) that you can SET with a push button when you have attended to the cooking. Using an active low output to drive the LEDs gives you a tiny bit more drive from a CMOS chip Classic CMOS circuits can operate at 9V and draw almost no current when idle so you can use a PP3 transistor battery to power it for a long time. You can use a couple of LEDs in series and a current limiting resistor to get the best mileage out of the 9V supply with limited current draw on the IC pins (using 4 gates at 2mA in parallel will give you 8mA drive enough for a high efficiency LED). Calculate the resistor with (9V-Vled)/0.008 for a single red LED at 2.2V you get 850Ohm or use a 1kOhm standad value.