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Thread: Andy40's Madbean Greenbean (tubescreamer)

  1. #11
    Overlord of Music Andy40's Avatar
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    Arrrrggg. Nothing but static and squeal. I gotta put it down as I'm outta time. See if you can spot the problem.
    Build #1 - ST-1 - Completed and upgraded
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  2. #12
    Overlord of Music Simon Barden's Avatar
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    I can see two capacitors that I think are the wrong value, C1 and C4. 4n7 (4.7nF) installed instead of 47nF.
    Build #1 ES-3 under construction http://www.buildyourownguitar.com.au...ead.php?t=6489
    Build #2 EX-1 (with alder body) Yet to start. http://www.buildyourownguitar.com.au...093#post123093

  3. #13
    Overlord of Music WeirdBits's Avatar
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    According to the values written on the mag board, yep.
    Scott.

  4. #14
    Overlord of Music Simon Barden's Avatar
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    Apart from that, testing a gain pedal out of its grounded case might let a lot of noise pick-up in.

    Also, if you've bought the parts yourself, double check that all the capacitor voltage ratings are 25v or higher. I checked over half of the resistor ratings and they looked OK, but you might as well double-check those.

    However... looking further at the greenbean website diagram, I think I know what the problem is. The input jack has no direct ground connection and is reliant on the casing connecting the ground through from the output jack. Not surprising you just get noise as there's no complete circuit and the guitar is just acting like a noise aerial! Try linking the jack socket grounds together when testing without a case. You'll probably need to replace C1 and C4 to get the sound right but they probably won't stop it working.
    Build #1 ES-3 under construction http://www.buildyourownguitar.com.au...ead.php?t=6489
    Build #2 EX-1 (with alder body) Yet to start. http://www.buildyourownguitar.com.au...093#post123093

  5. #15
    are some of those resistor solders (towards the bottom right) a bit dry? hard to be sure without seeing the other side of the pcb though

  6. #16
    Overlord of Music Andy40's Avatar
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    Thanks guys, I pulled those caps and replaced them. There was something wrong with how i wired that switch, it was a bit more than just the earthing issue.
    Tested on the breadboard today with the new caps and bypassed the switch and she worked a charm!

    This circuit really rocks!
    Build #1 - ST-1 - Completed and upgraded
    Build #2 - LP-1SS - Completed | Co-Winner-May 2016 GOTM | Runner up GOTY 2016
    Build #3 - TLA-1R - Completed
    Build #4 - SGD-612 - Completed | Runner up Feb 2017 GOTM
    Build #5 - ES-1G - Completed
    Current Build #6 - STA-1HT
    Current Build #7 - JBA-4

  7. #17
    Overlord of Music Andy40's Avatar
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    Sufficiently rocked and boxed

    Time to decorate
    Build #1 - ST-1 - Completed and upgraded
    Build #2 - LP-1SS - Completed | Co-Winner-May 2016 GOTM | Runner up GOTY 2016
    Build #3 - TLA-1R - Completed
    Build #4 - SGD-612 - Completed | Runner up Feb 2017 GOTM
    Build #5 - ES-1G - Completed
    Current Build #6 - STA-1HT
    Current Build #7 - JBA-4

  8. #18
    Overlord of Music Dedman's Avatar
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    congrats! No idea what any of the afore mentioned posts were about but I take it you got it working!
    Build 11 MKA-2 - in progress
    Build 10 Basic strat finished
    Build 9 JM Kustom finished
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