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plotting a power amp build and want to put an EQ and volume control out front. basically a take on a SD powerstage. The power amp module has a built in PSU and an auxilery bipolar 12v output. I've heard people say that running an op amp circuit off of ±V instead of +V/VREF is an easy mod, but I...

but then they had to unhook everything and unscrew the battery door on the bottom when they DID expire :p

there are bypass footswitches for both effects as well as a toggle switch to turn off the battery. it breaks the negative connection so the battery doesn't die. i guess they hadn't worked out switching jacks yet

in the event that i disconnect that battery switch and take both grounds to the negative pin on the DC jack, think the issue would just go away? because that's the end-goal. get both circuits to work on a single 9v supply, add a protection diode, maybe a small dropper resistor to simulate a C-Zi...

if they weren't working at all, I'd expect it to not work with batteries, but it does

yes, polarized. negative end of the caps go to the battery disconnect switch/negative battery terminal

alright braintrust, here's a fun one. I was sent a vintage Rosac to check out/repair/mod so that it is no longer powered by 2 separate 9v batteries. It works fine on a battery, he said, but a voodoo lab power supply to battery snap adapter made terrible noise. those were my findings exactly...

that is exactly the kind of quick and dirty solution i was looking for. i guess it's a modern take on the anderton schematic i saw but it didn't look complete. this with a fixed volume and a DPDT bypass switch will be perfect

yes, the original pedal is fairly scooped already

Hello all, I’m looking to add a mod boost eq to the front of an existing circuit. I know the Clapton mid boost exists, but it is huge. Hoping for something op amp based. Just need to be able to switch in some mids to goose the front end. The zorkmid has this sort of boost, but the build doc...

swapped out Q1 and Q2 with 5457's an biased everything to 10v (at 18v input) and got some pretty solid results. the low gain section of the pot is still tiny, but it at least exists now. might try the rest as an experiment later

howdy just built up the boogie monster running at 18v, biased all nice, and it sounds great for the heavy rock and metal stuff. all the rectum frier tones i could ever want. but even at A1M, seemingly the most subtle of all pot tapers, the gain knob is like a switch. almost no sound to BAM as...

built the board, installed the drivers, pulled down some programs from github. loaded one into ASprogrammer. program. completed. take it over to my test rig, plug it in, no effect. wet/dry just acts as a volume control. i'm so out of my depth here. help

this should be one for the ages. I was asked to take a look at this bad stone for repair. I made no promises, but said I'd take a look. shewwwww boy does this thing smell bad. and the work in here might be worse. it would seem there was an attempt to remove the manual phase option. Can't say I...

got side tracked with other projects. just got it boxed up, and now that it's grounded in the case, the oscillation is basically gone. if i crank the gain AND the mids, it will make a funny honk noise when i turn off my gate. but under normal use cases, the problem i was having before is...

the gain knob, and generally when it's over I'd say 80%. the pitch of the oscillation changes as the knob is turned. oddly when I put my finger on the bass pot it pretty much goes away. the residual noise is likely a mix of the absurd amount of gain and the crappy wiring in my apartment. I use...

these

just the standard enclosed plastic mono jacks from tayda. i don't tend to box them up until i confirm they are built correctly, so if the enclosure is going to help ground it all, then i can proceed.

shielded wire didn't do anything. and my jacks are all the way down by the switch. nowhere near the gain knob. is this thing going to be grounded once i put it in the case?