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    Trying to make a small momentary touch switch with CR1220 button cell battery...

    Thanks. Basically, I'm trying to have the diode lase as brightly as possible when the user bridges the contacts. By dropping the resistor value, do I run into an issue with the transistor I'm trying to use?
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    Trying to make a small momentary touch switch with CR1220 button cell battery...

    Thank you. So just a 1k ohm resistor is OK? That laser diode is 20mA current at 3V
  3. D

    Trying to make a small momentary touch switch with CR1220 button cell battery...

    ...But I am an uneducated buffoon when it comes to EE. I'm wanting to use a 3V lithium CR1220 button cell battery to power a cheapie 3V 5mW red laser diode rated for 20mA. Here's my shopping list: Lasers...




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