Author Topic: [Solved] Mudbunny - no signal when tone bypass is engaged  (Read 64 times)

misterpants

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[Solved] Mudbunny - no signal when tone bypass is engaged
« on: June 09, 2021, 10:11:06 AM »
Hi folks--

I'm building a Mudbunny board with the Creamy Dreamer BOM. When the tone control is engaged, it works beautifully and sounds great. When I use the tone bypass, however, I lose all my signal.

I've tried changing the settings on the dip switches, but I get the same result. I verified the switch with a continuity tester, and everything looks good.

Has anyone else encountered this issue? If so, what steps did you take to resolve the problem?
« Last Edit: June 09, 2021, 11:44:09 AM by misterpants »

benny_profane

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Re: Mudbunny - no signal when tone bypass is engaged
« Reply #1 on: June 09, 2021, 11:08:50 AM »
The relevant components for the tone bypass are the toggle switch, DIP switch, C11, C12, R20, and R21.

I would suggest reflowing the relevant pads for the passive components (the resistor pads in particular) and clean the area carefully (avoiding getting flux residue into the pots/switches). Did you confirm that the DIP switch is working properly? Also, an audio probe will be able to tell you exactly where the signal is dropping out.

misterpants

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Re: Mudbunny - no signal when tone bypass is engaged
« Reply #2 on: June 09, 2021, 11:43:32 AM »
The issue was an incorrect resistor value at R20 and R21, causing the signal to go to ground. Everything works as expected now. Many thanks for your help.