Tyrian/Sanguine Vref

[temol]

What's the purpose of the split Vref in Tyrian and Sanguine? Tyrian especially - additional split to B and C.

T.

 

[Chuck D. Bones]

It's to provide isolation between stages. This is a very high gain pedal and any signal that sneaks onto the Vref line will couple from stage-to-stage, potentially causing oscillation. It might be overkill, but better to be safe. Both circuits had spare opamp(s), so it's basically a freebie.

 

[temol]

Thanks. I suspected something with isolation of the supply. This leads to another question - when combining those two on a single board - would it be better to have separate power sections for T and S or use only one (Tyrian) power supply for both circuits?

T.

 

[Chuck D. Bones]

Do you intend to run them in series?

 

[temol]

Not sure yet. It would be nice to have different configuration options, but as for now - A/B, as a two channel pedal.

T.

 

[Chuck D. Bones]

Stringing those two high-gain pedals in series might result in nuclear meltdown. If you are seriously considering a series connection, I'd leave the two boards separate to maximize isolation and minimize the risk of oscillation.