Home GuitarPCB Forum GuitarPCB Build Support Killer Bee Boost switch issue

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  • #29837
    dddurham11
    Participant

    My first build. Happily I have some tone coming through but when switching the DPDT boost switch I lose anything. Any tips appreciated on what I should be looking for (have rechecked all solder joints / have trimmed to 4.9v J113).

    If it helps – there does seem to be a boost of treble frequencies when the switch is in the other position and I get tone. I wonder if that means the boost circuit is working but the primary isnt?

     

    Appreciate any thoughts.

    #29838
    Billy
    Moderator

    Looking at the schematic It either switches in an extra gain stage or bypasses it continuity check all your switch connections

    You’d need to work out which position fails boost position would switch volume lug 2 to R16 and R14/ 15 to out jack tip

    In the other position volume lug 2 to out jack tip

    This is how I think the switch is connected you want to check the middle common row connects to the top row in one position and middle to bottom in the other position but not both at the same time

    Here’s a PDF if you’re unsure with continuity checks

    https://drive.google.com/file/d/176vVBWeRaSQ0QvZlnozjKHE6AeHsvxFP/view?usp=drivesdk

     

     

     

     

     

     

     

    #29843
    dddurham11
    Participant

    Thanks Billy. Its the boost circuit that is failing to engage. Would it make any difference that Inused NP caps instead of polarised?

    #29846
    Billy
    Moderator

    I wouldn’t think so it’s more likely to be a dry solder joint or something similar in that part of the circuit

    I’d reflow your solder joints from R16 to R14 / 15

    Do you have an audio probe

    #30826
    Thomas a Meacham
    Participant

    I do have an audio probe

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