The great "I'd like to see the guts of" thread

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.

Re: The great "I'd like to see the guts of" thread

Postby Manfred » 06 Mar 2019, 21:16

temol wrote:It's a DPDT (SW1.1 and SW1.2) on/off/on switch. So in a middle position C7 is disconnected.

T.

In that cases, in each ON positions the capacitor C7 is connected in parallel to the capacitor C6 on in the same manner,
the resulting capacitance is the still the same.
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Re: The great "I'd like to see the guts of" thread

Postby Manfred » 06 Mar 2019, 21:23

Why does the EDIT-Button not work?

I see now, it works together with the resistor switching by S1.1.
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Re: The great "I'd like to see the guts of" thread

Postby temol » 06 Mar 2019, 21:33

Manfred wrote:I see now, it works together with the resistor switching by S1.1.


Exactly :)

T.
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Re: The great "I'd like to see the guts of" thread

Postby Chuck D. Bones » 28 Apr 2019, 06:51

temol wrote:It's a DPDT (SW1.1 and SW1.2) on/off/on switch. So in a middle position C7 is disconnected.

T.


I see something that looks wrong. IC1.2 is supposed to be a mid-boost stage, but R30 is so large that the mid bump is barely 1dB. R30 is at least an order of magnitude too large. I'm guessing R30 is more likely 10K. The Sanguine has the same problem. Has anyone actually measured these resistors? I know surface mount resistors are hard to decode sometimes.

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