Home Forums GuitarPCB Build Support Add Verb R2 100k or 27k?

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  • #20584
    Michael
    Participant

    The Add Verb build document shows the main PCB with a 27k resistor at R2 but the BOM notes it should be a 100k resistor. My kit includes the 27k resistor… is that  the correct resistor to use at R2?

    Many thanks in advance!

    #20585
    Cybercow
    Moderator

    The BOM in my build doc for the Add Verb shows 27K. It’s what I used and works well.

    And if you look closer, R2 shows as 27K in the graphic for the PCB component values.

    #20587
    wilkie1
    Moderator

    I can see some confusion.  The schematic showed R2 as 100K.  The BOM also showed 100K.  This would yield a gain of 2 for IC1a.  27K would yield a gain of 7.4.

    Perhaps there was a change when Barry updated the wiring diagrams?

    #20589
    Cybercow
    Moderator

    Wilkie – I can see the discrepancy in the build doc that is online with PCB page. But the build doc I have has 27K across the board (BOM, schematic and PCB image) for R2. I suspect an error on the updated version that resides in the online PCB page..

    #20590
    Barry
    Keymaster

    Yes a quick Forum search indicates we updated this board to 27k to add a little extra Volume to the circuit.

    I was personally fine with 100K but 27k added more.

    Either way all is well and I will fix the Doc.

     

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