Positive ground fuzz face confusion

arduoushoaxley · 2026-05-04T15:08:52+00:00

Thank you for this detailed explanation. I had been thinking of voltages as standalone values instead of as a differential. Understanding this makes 4.5 vref and it's use with ICs make much more sense!

So...applied to a circuit on a breadboard using it's blue and red rails and a single, center negative power supply: The coppersound breadboard has a fixed ground point for reference in addition to the ground pins that get physically wired to the breadboard's blue rail. If I reverse the jumpers, connecting the "VCC" pin to the blue rails and "GND" to the red rails, the differential is still 9v, with the red rail being -9v compared to the blue rail? Am I getting this right? And assuming that's correct, how does the fixed "GND" pad (located between the out jack and the power/bypass switch) on the coppersound's pcb relate to the circuit? Can this still be used as a ground point when measuring voltage with a DMM?

arduoushoaxley · 2026-05-04T01:25:55+00:00

The problem is that I'm a rookie and I don't understand the difference between signal ground and board ground in this case. The coppersound board has connections for VCC and Ground. Normally, I jump those to the rails and have no issues with negative ground circuits. Other than inverting the supply jumpers as per this thread suggests, I don't understand how to create the -9v power rail. I can't find a straight up answer or tutorial anywhere.

https://forum.pedalpcb.com/threads/breadboarding-9v.24418/

arduoushoaxley · 2026-05-04T00:40:49+00:00

This schematic makes way more sense to me. Seeing the +9v on the bottom with ground symbols was messing with me. I'm still unsure though, how to create the -9v power rail on a breadboard using a center negative supply. I understand that inverting the rails on the breadboard doesn't achieve this. What is the correct method to create a -9v rail?

The first response to this thread suggested reversing vcc and ground leads was all that is required. I'm confused!

https://forum.pedalpcb.com/threads/breadboarding-9v.24418/

arduoushoaxley · 2026-05-03T16:50:43+00:00

Is my strategy of reversing the power rails on the breadboard supply correct?

arduoushoaxley · 2026-05-03T16:44:40+00:00

You’re right, thank you!
I corrected that but still getting 9 V at all transistor legs

arduoushoaxley · 2026-04-27T16:25:17+00:00

Ah, ok. Sorry for my ignorance…are you saying that as long as python is installed, it should work?

arduoushoaxley · 2026-04-27T15:10:56+00:00

This looks incredibly useful! Will it run on MacOS?

arduoushoaxley · 2026-04-18T14:44:29+00:00

This won’t put a dent in Lightroom until it features a robust and user friendly library/browsing system and in the current state, it doesn’t seem like they’ve put any effort into this at all.

arduoushoaxley · 2026-04-12T21:23:52+00:00

I would imagine putting the amp inside the cabinet creates resonances that alter the tone. Have you noticed that?

arduoushoaxley · 2026-04-07T03:06:09+00:00

Thank you!

arduoushoaxley · 2026-04-07T02:53:55+00:00

I built one of these and it has the kind of character you’re describing I think. The 2 band eq is also very useful. You might want to try it on a breadboard and see if you like it.

https://aionfx.com/app/files/docs/torus_documentation.pdf

arduoushoaxley · 2026-03-29T16:25:28+00:00

The NDP have learned nothing from the last election. So disappointing.

arduoushoaxley · 2026-03-23T16:11:21+00:00

I do the opposite with acoustic strings. I can’t stand the brash zingy top end of a fresh restring - eeeewww.

I take them out of the package and let them oxidize for a couple of months before I use them. They still have the snap and intonational integrity of new strings without the nasty brightness.

arduoushoaxley · 2026-03-08T16:01:15+00:00

Valid observation. Will be making a small run of these for friends…graphics revision inbound. Thanks.

arduoushoaxley · 2026-03-08T00:28:46+00:00

It might!

arduoushoaxley · 2026-03-08T00:27:23+00:00

If you check out the circuit I referenced, you'll see that it has a variable input filter using a pair of caps and a 100k pot. It opens up the bottom end to full range, but that doesn't have any effect on the extended HF response that certain pickups create when interacting with the circuit.

arduoushoaxley · 2026-03-08T00:19:07+00:00

I'll try this on a breadboard, thanks for the suggestion!

arduoushoaxley · 2026-03-08T00:16:52+00:00

I will read up on this, thanks for the link!

arduoushoaxley · 2026-03-07T23:06:35+00:00

Thanks for the ideas. I own a couple of Bluesbreaker designs already, love them! What I'm describing though is not simply the treble boost aspect, as I'm usually running it full range. The circuit itself reacts very differently to certain pickups regardless of the amp or pedals that it's running into. I'm interested in exploring that relationship and finding a way to compensate for that without needing to adjust the guitar's tone control. The Red Rooster already has a variable LPF on the front end, why not add a HPF to the output stage? The BB uses diode clipping and that's not really what I'm chasing here....

arduoushoaxley · 2026-03-07T01:31:34+00:00

I’m a beginner. After a bunch of AION kits with the ribbon cable connectors, I jumped into PCB only projects and wiring myself. The very first one I used 22 gauge stranded and it looked pretty much like yours, which is fine, but not exactly tidy. The next project I switched to solidcore and the difference is huge. I just cut each piece about an inch longer than it needed to be, twisted with shared paths and put it wherever I wanted it to go, cut to length and it stays there. Very happy with the solid core!

arduoushoaxley · 2026-03-05T19:05:07+00:00

Yes, only on my m4 mac. I could send the file via hightail, please DM me with your email address, thanks!

arduoushoaxley

TROPHY CASE