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Thread: Source for LDR? For rebuilding trem circuits

  1. #1
    Senior Member
    Join Date
    Mar 2010

    Source for LDR? For rebuilding trem circuits

    Greeting, I've had several amps with bad opto-coupler. Not sure what to buy to replace the light dependant resistor & where to get them. Rebuilding seems like the only option if it's not Fender. I appreciate any help....

  2. #2
    "Thermionic Apocalypse" -JT nickb's Avatar
    Join Date
    Dec 2009
    Devon, UK
    Assuming you are in the US try Jameco. I've bought these with great success you have to bend the leads of the LDR and hold it all together with heatshrink.
    Last edited by nickb; 12-03-2017 at 09:06 PM.
    Experience is something you get, just after you really needed it.

  3. #3
    Senior Member
    Join Date
    Mar 2010
    Wow, you saved "the day" !! I'll order tonite

  4. #4
    Supporting Member
    Join Date
    Dec 2009
    I've used the same LDRs that Nick posted with no problems at all. I bought 100 for 1 a few years ago. All the mainstream electronic suppliers were getting rid of non-ROHS stock in a panic and there were some insane bargains. They never thought it through that a cadmium cell would still be listed as non-ROHS anyhow after the smoke cleared.

  5. #5
    Lifetime Member Enzo's Avatar
    Join Date
    May 2006
    Lansing, Michigan, USA
    I bought a grab bag of those photocells from Jameco a long time ago, and still have a couple. Worked fine.
    Education is what you're left with after you have forgotten what you have learned.

  6. #6
    Supporting Member Randall's Avatar
    Join Date
    Jan 2013
    Cape Coral, FL
    I just ordered 10 of each.
    It's weird, because it WAS working fine.....

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