Need help on old DOD pedal (rewiring 9V)
So I have a FX55-b supra distortion with the old style 3.5mm jack power connector (tip positive)
https://imgur.com/a/FwozG https://imgur.com/a/t23u3
Rather than use a connector/adaptor cable I'm wondering if it is possible to rewire it with a boss style 2.1mm barrel style. I've attached pictures of both the barrel terminal I have and the original jack with wires. Yellow is going to 9V and red is going to the battery for switching. I basically need to know if what I want to do is possible and what terminals I would need to wire everything to. I also have a cable for my power supply that switches to centre negative if you think I would need to wire it up that way. (can do either)
Posted Aug 4, 2017, 8:09 PM UTC · edited
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It looks like the barrel jack you have will be fine, with the nut on the outside of the enclosure. I've done this with 2 of my old DODs. I just took out the 3.5mm jack and used a step bit in the old hole. Had just enough room to tighten the nut comfortably.
Edit: did mine center negative, woked fine. If you're unsure of what terminal does what you can use a multimeter to figure it out.
Cheers for the reply, I've got another two questions if you dont mind. On the original dc jack on the pedal there was no cable for ground, I believe that the enclosure itself was ground? I've read conflicting things online about these. I understand I need to connect the negative (9v) to the centre and the postive to the sleeve, but what do I do about the terminal for ground? Do I run a cable to the case or to the bit on the PCB where the black cable from the output is going (wiring seems to suggest this is to ground.)
https://imgur.com/a/wqtdt
I also can't seem to find any pictures online of how to wire this specific socket/jack. I can't seem to find one similar enough and work out what terminal is for what.
https://imgur.com/a/BUE9z
Thanks again.
Sorry for the late reply. You don't need to tie a wire in to ground. That jack has 3 terminals because it's a switching jack, they can be wired in a way that it disconnects the battery from the circuit when a plug is inserted so the battery won't drain. I didn't bother with that because there will never be a battery in these pedals as long as I own them.
Different style but the terminals are the same. Your negative goes to 1, that will be the center pin. Normally for these jacks you can tell because the terminal bends and ends at the middle of the connector. The other 2, well I honestly can never remember which one does what. I always plug a cable in and use the meter to see which one gives me 9v. It'll be one or the other. http://www.zseries.in/electronics%20lab/connectors/dc%20power/pictures/wiring%20female%20dc%20power%20connector.png
On these, the battery snap should be connected to 2 and the PCB should be wired to 3.