JHS - Angry Charlie V3 (3 band eq)  [traced]

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Re: JHS - Angry Charlie V3 (3 band eq)

Postby Duckman » 29 Mar 2018, 07:10

bugg wrote:
marshmellow wrote:C10 should be at the junction of R8/R9, not at the opamp output.


I won't argue that it should be, but I'm fairly certain that it wasn't.

@marshmellow As long as C10 is in the Vref net, there's no big difference. Check the pics in page 1 of this thread. :thumbsup
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Re: JHS - Angry Charlie V3 (3 band eq)

Postby Duckman » 29 Mar 2018, 07:15

Looks like this is the origin of that elusive tone section :mrgreen:
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Re: JHS - Angry Charlie V3 (3 band eq)

Postby marshmellow » 31 Mar 2018, 05:36

Duckman wrote:
bugg wrote:
marshmellow wrote:C10 should be at the junction of R8/R9, not at the opamp output.


I won't argue that it should be, but I'm fairly certain that it wasn't.

@marshmellow As long as C10 is in the Vref net, there's no big difference. Check the pics in page 1 of this thread. :thumbsup


Placing a capacitor of that size on an opamp output is just wrong, regardless of what the "designer" of the pedal did.

http://www.analog.com/en/analog-dialogu ... er-25.html
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Re: JHS - Angry Charlie V3 (3 band eq)

Postby shredgd » 06 Aug 2018, 05:48

bugg wrote:Traced from original, all SMD caps removed and measured. :mrgreen:

CharlesEQ.jpg


Full schematic (and PCBs) available here:
http://www.pedalpcb.com/product/angrycharles/


Hi,

thank you very much for your work. I noticed that R18 is 10k in the pedal guts shots at the beginning of this thread, so I think you should correct it in the schematic.

Cheers,
Giulio
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