Electrovibe

T

Tpruitt

Member
My vibe engaged really cuts the volume down. The fx is also pretty week and it’s hard to hear.
Mods
R4 two 1m in series =2m
R12 two 10m in parallel =5m
R14/15 =2k7

I also had to use a 200k trim and not the 250k in the bias spot.

Anything obvious?
 

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All my caps are right. All the resistors I checked last week.
Only thing I can do is take it apart to double check the volume pot is correct.
Maybe play it out of the enclosure.
 
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Yes. The volume never changes other than with the volume knob.
I took it apart and didn’t see anything that stuck out. Volume pots right. Nothing can touch the board. Triple checked the modded resistors.
I may just remove r4 and try that. Remove any signal to ground there.
 
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Took them out and measured. 2m.
Played the pedal with them out and no difference in volume.the pcb was out of the box also and I made sure it wasn’t laying on anything conducive.
Looked over the board again and no crossed solder spots. I’m at a loss
 
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R4 bleeds off some signal. Connected at the input it shouldn’t be a huge difference.
So today I printed out the pcb and went over every component one by one. All correct.
Flipped it over and reflowed every solder joint checking to make sure they weren’t touching another part. All good. No marks or cut or anything abnormal on the board.

Took out the volume pot and checked it.
Read 82k. Thought I’d try a 100k resistor across the pads. No change.
Checked my off board wiring. No stands floating off to touch something. Solder good.
At this point I’m thinking it’s a bad component. And it won’t be in the power section. Or even the bulb section.
Since I’m do this as a hobby I don’t have the equipment to figure out what component.
 
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