DBA Reverberation Machine....maybe i can make this thing enjoyable.

[Morbidpale]

Made one a long time ago and never connected with it. Recently I though it would be fun to take a swing at some redesign. Changes are circled in blue.
C9,R20,C13 help nudge the sound towards a more usable verb without losing too much of the dba style.
Feedback surge footswitch because its fun.
I'm still messing with the reverb pot value to see what feels better.
The level toggle cranks the gain way up to 11.
Tone control because everybody needs tone control.

My question is this: Adding the tilt control ends up inverting phase. Does it matter? What's the simplest way to swing the phase back around for the output? Maybe just a final stage from a BMP?

Here is the schem i worked from
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://pcbguitarmania.com/wp-content/uploads/2022/07/Death-by-Reverb-2v-Building-Docs.pdf

 

[Feral Feline]

Flipping the phase won't matter in MOST cases, but if you're using a parallel clean-blend it suddenly matters very much.

An inverting buffer is the simplest way to flip it back, either via a transistor or op-amp; or as you suggest,
adding another inverting gain stage such as the BMP's output stage.



It was my understanding from your post that you worked from PCBGM's schematic, but the "Verb Machine" PDF doesn't reflect that, ie the refdes doesn't match, quite different, for ex:

PCBGM C7 & R11
vs
Your VM's C9 & R20




I'm trying to adapt your Verb Machine mods to Moonn's schematic (the PCBGM schem a near direct copy of Moonn's), but the added TILT-EQ section... I'm having a hard time annotating that on my Moonn-schematic.
I need to put this down for a bit and come back to it with a rested fresh brain.

 

[Morbidpale]

Flipping the phase won't matter in MOST cases, but if you're using a parallel clean-blend it suddenly matters very much.

An inverting buffer is the simplest way to flip it back, either via a transistor or op-amp; or as you suggest,
adding another inverting gain stage such as the BMP's output stage.



It was my understanding from your post that you worked from PCBGM's schematic, but the "Verb Machine" PDF doesn't reflect that, ie the refdes doesn't match, quite different, for ex:

PCBGM C7 & R11
vs
Your VM's C9 & R20




I'm trying to adapt your Verb Machine mods to Moonn's schematic (the PCBGM schem a near direct copy of Moonn's), but the added TILT-EQ section... I'm having a hard time annotating that on my Moonn-schematic.
I need to put this down for a bit and come back to it with a rested fresh brain.

Sorry about the designations. I ment to clean them up so things went in order but I have to forget to something.

Im not sure I understand about the moonn pcb though. To add the tilt you would have to add a daughter board.

Im glad you mentioned moonn because I didn't know they had a schematic. Glad to see they needed a feedback control too.