Dunlop CBM95 Mini Crybaby

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

Hi all,
I own since ages this Dunlop CBM95 Mini Crybaby, which I love it as it is super compact and space friendly.

Lately I opened it to apply few mods (beside the 3DPT switch with bypass status LED which I already did years ago).
I didn't really trace the circuit, but from the components and values I saw, I think the schematic is the same one as the Crybaby CB95 with the input buffer and MPSA18 transistor.

In general I wasn't able to have a reading of the capacitors (beside the 220nF and the elcos which are 4.7uF and 220uF).
So I take for granted the other cap values are the same as on the standard CB95 schematic.
The only difference I've spotted is that the emitter resistor on Q2 is 430ohm instead of 390ohm.
Inductor is a Red Fasel.

For the frequency center cap values are also unknown as I wasn't able to get proper reading on my tester, but I would suggest following:
- High 10nF
- Medium 22nF
- Low 47 or 68nF

These caps have 1M resistors in parallel (to avoid pops when switching).

As said, I did few mods to the pedal (common stuff everybody knows about wah-wahs):
Input buffer cap 100nF (I love to have more low-end available)
Input Wah cap 33nF
Vocal mod 68k
bass/gain mod 410ohm
Mid mod 2k2

Place of course is tight being all SMD but it's doable.

N.B.: I have a new mini wah incoming, so I'll took some good detailed pictures of that one to share here.

IMG_6140.JPG
Last edited by Gila_Crisis on 21 Sep 2023, 15:13, edited 3 times in total.
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Gila_Crisis
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Post by Gila_Crisis »

Here the detailed pictures of a factory Mini Crybaby.
P1046084.jpg
P1046086.jpg
P1046085.jpg
P1046089.jpg
Zwischen Ordnung und Chaos fangt die Musik an

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Gila_Crisis
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Post by Gila_Crisis »

I also modified the second factory stock mini crybaby I used for the gut pictures.
On this one I didn't do the gain/bass resistor mod.
I think 430 ohm is a very well chosen value, and wouldn't go lower than 390/400 ohm.
Instead raising the values of the 2 input caps (before the buffer and the wha circuit itself) help a lot more to have a fuller sounding wah.
Zwischen Ordnung und Chaos fangt die Musik an

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