Chauffeur OD squealing

G

Grazza

Active member
Just finished another build and I have plugged it in to see how it goes and it's not good!
Chauffeur passes sound when not on but high pitched squeal when on. I've never experienced this before. I love some input on how to trouble shoot this one.
 

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Yep, as soon as it was in the box, it started squealing again. If the edge of the pcb is touching the inside of the enclosure in any way can that cause this?
Spewing too, it worked fine out of the enclosure last night
 
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Grazza said:
Yep, as soon as it was in the box, it started squealing again. If the edge of the pcb is touching the inside of the enclosure in any way can that cause this?
Spewing too, it worked fine out of the enclosure last night
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I just keep looking at that footswitch. Can you post another pic from an angle that shows the clearance there so I can stop wondering?
 
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I'm pretty sure it's not the switch, it was actually finally 100% working before it went in the enclosure. I don't like how it fits in the enclosure im thinking about drilling a new one and seeing how it goes. Don't like the jack locations or PCB fit
 

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Now it doesnt work outside the enclosure. I get a small amount of signal coming through and a whirring in the background like a plane engine is warming up. Assuming thats the charge pump. WTF.
 
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Had to step away from this for a while, doing my head in. Still high pitched whirring noise but also getting some signal through, will audio probe again when i have time. component values checked again and ok. everything has been reflowed. did have it working outside of box but everytime i put in enclosure the noise comes back and stays. IC values taken below, dont think i have posted those yet.

IC 1 1-8
5.1V, 5.1V, 4.9V, -3.9V, 5.1V, 5.1V, 10.4V
IC 2
5.1V, 5.1V, 5.1V, --4.4V, 5.6V 5.6V, 11.3V
IC 3
5.6V, 5.6V, 5.6V, -4.4V, 5.6V, 5.6V, 5.6V, 11.3V
ic 4
5.6V, 5.6V, 5.6V, -4.4V, 5.6V, 5.6V, 5.6V, 11.3V
IC 5
5.6V, 5.6V, 5.6V, -4.4V, 5.6V, 5.6V, 5.6V, 11.3V
IC 100
7.7V, 3.7V, 0, -2.6V, -5V, 2.9V, 4.5V, 7.7V

Don't know how normal the charge pump values are but the rest of the IC's seem normal right??
 
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