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Thread: takamine acoustic electrics issue cp-132sc

  1. #1
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    takamine acoustic electrics issue cp-132sc

    Morning

    I don't normally touch this sort of thing, But a local guitar shop that i do repairs for asked a favour as they brought it working then it failed
    sam_4907.jpg
    This acoustic has low output. Not pickup or battery. Injected a signal and i can see it til it gets to i ic called 4062
    This unit has 3 ic all with different numbers on
    signal seems to get going into pin 1 and 2
    any assistance ??

    have a good day people

  2. #2
    Supporting Member Jazz P Bass's Avatar
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    What you see are two different opamps.
    UPC4572
    ADA4062

    The pinouts are standard opamp configuration.

    Pin 1 output A
    Pin 2&3 Input A
    Pin 4 -V
    Pin 4&5 Input B
    Pin 7 Output B
    Pin 8 +V

  3. #3
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    thanks jazz bass. I did look at the ada4062 but pin 1 and 2 are connected together via track ( can see in the picture ) and ive tested with dmm. when i checked the net for pin out on a ada4062 i noticed the 1-2 are input and output so this lead me to believe that it wasn't an ada4062.

    will check tomorrow again

  4. #4
    g1
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    An op-amp with input connected to output is a standard unity gain buffer:
    voltage-follower.png
    Attached Thumbnails Attached Thumbnails 230px-op-amp_unity-gain_buffer.svg.png  
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  5. #5
    Senior Member Enzo's Avatar
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    Op amps have two inputs, an inverting one and a non-inverting one. It is very common for one input to tie to the output.


    Edit: g1 beat me to it.
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    Education is what you're left with after you have forgotten what you have learned.

  6. #6
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    Many thanks
    Ive learnt something new today

  7. #7
    Supporting Member Jazz P Bass's Avatar
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    Here are three circuits that I pulled off of the ADA4062 datasheet.
    Attached Files Attached Files
    TomCarlos and g1 like this.

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