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Topic: Listening to 12V Signals with Optocouplers? (Read 2417 times) previous topic - next topic


I was referring to COMMON VENDOR pricing for roughly a worst case scenario (besides Radio Shack)... but my point is  resistors are  only pennies.  Personally, I buy my resistors from places like Tayda at $0.03 each


well i certainly didn't mind the cents that the resistor cost more the soldering of the board. anyways i agree with whats being said here i just wanted to understand the fundamentals behind it.

thx for all the input.

anyways circuit is done and its right on the sweetspot:
10mA a Pop for a total of 60mA draw at 12V...woho :)

still have to get some experience soldering but it worked out okay..


and the updated schematic for people to reference:

Nick Gammon

I got these zero-ohm resistors for $4 for a batch of 500:

Please post technical questions on the forum, not by personal message. Thanks!

More info:

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