Build Your Own Clone Message Board

I’m rehousing my 27 volt boost into a larger box. While I’m there, is it possible to add a battery snap? I’m guessing no since I don’t see a spot for it on the PCB.

Yep, just put the red wire on the extra (+) lug of the DC jack and the black wire onto ground anywhere—the easiest place is probably the sleeve of one of the I/O jacks.

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Scott

My band, Austin Hollow

Just be aware that, with that 27V differential driven by a charge pump, it's likely to go through 9V batteries at a pretty rapid clip!

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“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Thanks for the solve. I want to add it as insurance. But now I’m curious how fast it’ll burn through it!

Ok wired it up and I’m getting nasty distorted buzz when using the battery. Works like normal on the power supply. Any ideas on what I wired up incorrectly? The red wire from the battery snap is attached to the open spot on the DC input. The black wire is attached to the sleeve of the output jack.

That sounds like a grounding issue. Normally I would say try running a jumper between the sleeves of the input and output jacks, because with metal frame jacks, they're not grounded when they aren't touching the metal of the enclosure. But in this case, your jacks are both grounded at the PCB. And in any case, if it only happens when you're running on battery, that wouldn't make sense.

You don't have anything plugged into the DC jack when you're testing on battery, right? The jack is set up so that it disconnects (and thereby preserves) the battery when it's plugged in to wall power. But again, I don't think that would cause buzzing.

Sorry, thinking out loud here (but maybe providing some useful info along the way).

I must be missing something obvious. Do you have a multimeter that you could use to check continuity across all ground points?

_________________
Scott

My band, Austin Hollow

I’m reading elsewhere that the black wire should be connected to the ring of an I/O, not sleeve. Wondering if that was my goof. Will try tomorrow.

It's a good idea to make that change, but doubtful that it will help the noise problem. The reason for connecting to the ring of the jack (generally the input) is so that the battery won't have a path to ground unless there's a cable inserted in the jack, which causes the ring to contact the sleeve of the cable tip. That makes it easy to preserve battery life by pulling the cable out of the jack and disrupting the required ground path for the battery, when the pedal is not in use.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Rule #1: always test with a fresh battery. That was the issue. But I will rewire the ground to the input to avoid battery drain.