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Hey Team, just ordered parts for a BMP-OPAMP and am looking to get ahead of what I already can’t figure out.
It has A/B pads for ‘injecting your own clipping configuration’. As a relative pedal newb, I am seeking explicit instructions.
- Can I use a DPDT switch instead of a roto-tone? If so, DPDT On On?
- By ‘other clipping configuration’, what are some options?
- If I do set up a DPDT switch with other clipping options, do I have to remove/change anything that is soldered to the board in a stock setup?
This all came about because I pre-drilled a pedal for a different board, and have holes for 3 knobs and a switch. I was originally thinking a tone bypass switch, but was surprised to see that wasn’t an option on this board.
If someone knows a way to incorporate a tone bypass switch, open to hearing those ideas too.
Thank you for the help!
Lincoln . . . .
- Yes
- There are few limits on how switching can be managed – it depends on the space available within the enclosure as constrained by the drilled hole spacing in the enclosure. A SPDT On-Off-On toggle can also be used if creative wiring is applied and the center position can be no clipping at all.This (below) is an Opamp BMP with the type of clipping you suggest – but with a SPDT (On-Off-On) toggle.
- You can leave one clipping element (diodes, LEDs, etc) leg hanging as I did in the above photo. Or you can can leave out any of the clipping elements from the PCB and just points “A” & “B” to connect the clipping elements via a switch.
For bypassing the tone section, you can jumper lug #2 of the volume pot to C7 and lift the one leg of R11. A DPDT On-On toggle should do it.
I’m sure Barry will have these back in stock soon, very handy for clipping options on a DPDT. With a On/Off/On switch, the center position would bypass any clipping diodes on the little DPDT board.
here’s an example of just a few of the zillion clipping mods you might choose.
http://beavisaudio.com/beavisboard/projects/bbp_DiodeMods.pdfhere’s a similar mod where i wanted clipping options.
cheers 🙂
Thanks for the tips! I have some of those DPDT boards, so I’ll combine both recommendations!
The op amp board has 6 diodes, the dpdt board only has room for 3 if I’m interpreting this correctly.
So do I use an on-off-on DPDT, populate 3 diodes on the main pcb, then on the DPDT board I can do the super 70s mod where there are 3 stock diodes on one side and 2 LED’s on the other side? So my options would be 6 diodes, 3 diodes, or 3 diodes + 2 LEDS?
either of those scenarios will work, it becomes a design decision. in my case, i chose to omit the clipping diodes on the board and used a On/On DPDT.
This (below) is an Opamp BMP with the type of clipping you suggest – but with a SPDT (On-Off-On) toggle.
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