Question about a mod

[peeeeeeej]

Hey there! I’m getting ready to build the dr phybes pedal and I’m planning on including the 45/90 mod. Is the needed DPDT switch an on/off or an on/on? My gut tells me on/on, but the guide doesn’t (seem to) specify.

Thanks!

[Chuck]

Either an On/On or an On/Off/On will work.  On/On is a bit “slicker” and will save you the frustration of flipping the switch to the middle/Off position and puzzling out why your pedal doesn’t work (don’t ask how I know that).

Chuck

[Ollie]

I have a similar question. For muffin mods 1 and 2 can use an on/off/on instead of an on/on and place differing values on the outer lugs with center lugs wired back to the board? I’m thinking 1n and 10n on the low pass but but not sure what I would use in addition to the 100n on the high pass.

[Chuck]

Ollie, in most variants the 100n is the standard value for C1.  If you use an On/Off/On DPDT with a 10n in C1 and a 100n at the top of the switch as shown in the build document you’d get the stock sound with the switch down, the high pass mod with the switch in the middle so you could put either a lower value at the top for a ‘higher pass filter’ or something more than 10 but less than 100 for something in between.  If you have one of Barry’s DPDT wiring boards you can socket the capacitors on the switch and have a field day swapping them in and out until you’ve found perfection.

Chuck

[Ollie]

Rad. That’s what I thought. Thanks. Got another one. In muff mod 6 where is the op amp? I see silicone and led on board but no ic.

[Chris]

Hey Ollie – I think that is a copy/paste error in the document, like you noticed, there is no Op-Amp in the non-Op amp Muff’n.

The Blues buster circuit also has a multiple clipping mod, where the off position of an on/off/on cuts the feedback loop out and only drives the opamp, so I think this was probably just a copy/paste error in the documentation.

[Author]

Posts