Carl Martin Crush Zone Schematic

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Carl Martin Crush Zone Schematic

Postby Manfred » 05 Dec 2016, 16:16

I traced the Carl Martin Crush Zone distortion and measured the voltages at the transitors.

CarlMartinCrushZoneShot.jpg


CarlMartinCrushZoneSchematic.JPG
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apollomusicservice (05 Dec 2016, 16:37), bmxguitarsbmx (05 Dec 2016, 18:20), Intripped (05 Dec 2016, 18:43), karul (05 Dec 2016, 17:14), moon-ra (06 Dec 2016, 18:31), Nocentelli (05 Dec 2016, 22:53), Zokk (06 Dec 2016, 09:41)
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Re: Carl Martin Crush Zone Schematic

Postby Intripped » 05 Dec 2016, 19:03

i assume the original pedal is not true bypass, there's a DPDT switch fitted in it, but i see a 3PDT switch in your schematic.
so probably you've already modified it, that's ok, but what i don't like are the pulldown resistors: they are always on the signal, and this is not good; you should put the 2M2 res after the 3PDT switch, and the 100k res before it.

thanks for your work, rock on!
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Re: Carl Martin Crush Zone Schematic

Postby Manfred » 05 Dec 2016, 19:23

Intripped wrote:i assume the original pedal is not true bypass, there's a DPDT switch fitted in it, but i see a 3PDT switch in your schematic.
so probably you've already modified it, that's ok, but what i don't like are the pulldown resistors: they are always on the signal, and this is not good; you should put the 2M2 res after the 3PDT switch, and the 100k res before it.

thanks for your work, rock on!


Thank you for pointing that out, no I didn't modify the circuit, that was my mistake.

Here the corrected schematic:

CarlMartinCrushZoneVoltagesCorrected.JPG
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Re: Carl Martin Crush Zone Schematic

Postby Manfred » 06 Dec 2016, 07:55

I found a modded schematic in my schematic library, and add the mods to my schematic.
I have no idea how the mod affects the sound.
Who knows more about?
I am not sure whether the 39k and 1uF values are right, because the original schematic is small sized and blurred.

CarlMartinCrushZoneMod.JPG
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Re: Carl Martin Crush Zone Schematic

Postby EddieTavares » 07 Dec 2016, 15:11

The input cap is 220p, is it correct?
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Re: Carl Martin Crush Zone Schematic

Postby Manfred » 07 Dec 2016, 17:20

EddieTavares wrote:The input cap is 220p, is it correct?


Yes, it is correct.
The added image shows the input capacitor C10,
you can find the imprint "221".

C10.jpg
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