Home Forums GuitarPCB Build Support Muffn 3.5 Low volume (Solved)

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  • #20628
    Stu
    Participant

    Hi guys,

    Havent required you help in a while up to my 14th build with usually no issues!

    My 1st ever build 2 yrs ago  was was Muff’n  green russian and it works perfectly so I have just built another one for a friend. During the build I accidentally used a A100K pot for Tone instead of B type but figured the audio taper would mean tone would change over smaller increment? No big deal, plus when you solder pots direct to the board they are a pig to remove.

    You may note I have soldered input to R1 as it snap during install and power in look like a short but is an illusion cause nothing work work if that was the case!

     

    I have the MId scoop B25k pot, Bender and clipping sw connected but they dont seem to influence the sound, reaching out to the wizards!!

    Thanks in advance

    Stu

    #20646
    Billy
    Moderator

    So you’re getting effect Stu just low volume is that correct

    Could you post a pic so we can see all the offboard wiring to switches jacks etc

    #20647
    Stu
    Participant

    Hi Billy,

    I just noticed I built this off an old V3 build guide instead of the V3.5 one. the only difference I see is R27 on V3 board is 1K and V3.5 is 3K3, would this make a difference?

    Will post more Pic this afternoon

    Thanks Stu

    #20648
    Stu
    Participant

    Just noticed all R27 does is current limit for Leds correct?

    #20649
    Billy
    Moderator

    No Stu that’s just the LED current limiting resistor

    What’s the rusty looking patch near D5 and 6

    Did you try reflowing the volume pot solder joints? the out tip solder joint looks a little dull too

    #20694
    Stu
    Participant

    Had transistors in backwards, was following silk screen but using BC549, All good

    Thanks Billy

    Stu

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