Your Source for DIY Pedal PCBs and NostalgiTone! › GuitarPCB Forum › General DIY Pedal Discussion › New Mod Board Idea
- This topic has 5 replies, 3 voices, and was last updated 5 years, 2 months ago by
Barry.
-
AuthorPosts
-
March 28, 2021 at 12:09 pm #17878
Big OParticipantWould there be any interest in a Mod Board to wire up an On-On-On DPDT switch for 3 different switching options (Diodes, Caps, Resistors, etc.)? Below would be an example of a potential board, borrowing graphics from this website, which I believe would work. I have used this layout on multiple projects but using perfboard. I don’t know if anyone participating on the board would like something like this or see it as useful for their own purposes. It is just a suggestion and for my purposes would make it easier for wiring one of these switches. Yellow traces are from the component to the output. Red traces are what would be required from the input to the lug positions including the diagonal jumper.
March 28, 2021 at 3:12 pm #17882Anonymous
GuestSince the present GPCB DPDT wiring board connects the IN and OUT pads to the 2 and 5 pads, it is already possible to wire a ON-ON-ON switch to handle 3 components. If Barry wanted to offer a board that had provision for a third component it could be used for both internal switch patterns by flipping the board over. See the diagrams below:
March 29, 2021 at 11:33 am #17904
Big OParticipantNot quite sure I follow you on this. I do not what the topology of the GPCB DPDT wiring board is. That is, what is connected to what and how each pad is labeled. Once I know this then I could figure out the switching arrangements. The switch lug # convention you show above is different from what I learned where #1 is side by side #4. Below is how I thought the connections (yellow) are made on the board, but I am probably wrong about this. I assume one would connect component C to one of the pads on each side of the board depending how the switch was oriented.
March 29, 2021 at 11:55 am #17906Anonymous
GuestYou have the correct board internal connections. Only the numbering convention is different. GPCB uses the “U” shaped convention where the top left lug is “1” and the numbering proceeds anti-clockwise down 1-3 and around 4-6 back up with “6” being opposite to “1”.
In the diagrams above, the dark blue lines represent the internal switch connections. Note that there are 2 different internal patterns for the center “ON” position. We have identified these patterns from different manufacturers.
March 29, 2021 at 12:04 pm #17907
Big OParticipantMaybe this is what you were describing? Component A in Blue, Component A in Red and Component C in Magenta based upon the way the center position of the switch is oriented.

Regarding the 2 different internal patterns for the center “ON” position from different manufacturers, I always test out the pattern of the middle position with a continuity tester and use a sharpie to label it on the outside of the switch. That way less mistakes are made as I have learned from experience during my first use of an On-On-On switch.
Looks like I will be investing in some of these boards in the future. Maybe it would be good to add some of this discussion in the documentation of the DPDT board. It might help out some of us less ingenious people figure out some different configurations and uses of the board switch combination.
March 29, 2021 at 3:14 pm #17912
BarryKeymasterBig-O you are pretty artsy oriented which is probably a bit of State College, Pa that rubbed off on you.
That is a compliment from my corner BTW!
That said if you care to make a drawing that you deem sensible for all levels of builders and would take up say a “Page” would you care to put something together for me?
-
AuthorPosts
- You must be logged in to reply to this topic.




