I need your help with something:
I’ve played the Corduroy some more and found it too dark so I removed the 25kB pot and replaced it with a 50kB. It’s brighter now but the brightness pot doesn’t do anything anymore! This was one of the issues when I first build this circuit, this is my second PCB and trial.
Removing the pot was sensitive because it’s a tight space and it overheats quickly.
So after removing and replacing the pot I measured the connections and it connects to C19, and mass so it should work AFAIKT?
If I read the schematic correctly this 10n connected to the brightness pot to mass looks like a normal guitar tone pot but then reversed? For a neck pickup 10n or 15n is often used.
Chuck mentioned that the bias of Q4 influences the brightness pot as well.
- Could the bias be set to a level that the brightness pot doesn’t work anymore? I can’t imagine it but just asking.
- Not sure what else to measure from the brightness pot? Anything make a false contact maybe, maybe lugs 1 and 2 connected together thru heating?
Thanks for your help!
I’ve played the Corduroy some more and found it too dark so I removed the 25kB pot and replaced it with a 50kB. It’s brighter now but the brightness pot doesn’t do anything anymore! This was one of the issues when I first build this circuit, this is my second PCB and trial.
Removing the pot was sensitive because it’s a tight space and it overheats quickly.
So after removing and replacing the pot I measured the connections and it connects to C19, and mass so it should work AFAIKT?
If I read the schematic correctly this 10n connected to the brightness pot to mass looks like a normal guitar tone pot but then reversed? For a neck pickup 10n or 15n is often used.
Chuck mentioned that the bias of Q4 influences the brightness pot as well.
- Could the bias be set to a level that the brightness pot doesn’t work anymore? I can’t imagine it but just asking.
- Not sure what else to measure from the brightness pot? Anything make a false contact maybe, maybe lugs 1 and 2 connected together thru heating?
Thanks for your help!
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