Blackstar Artisan EQ and low power design switch questions

[walkman]

Hi ,

I was looking at the Artisan 15 and 30 schematics and wanted to know a couple of things

1. How the low power 5/15 and 10/30 switches work

2. Why the EQ or tone have an addition al path that bypasses one stage.




Has anyone implemented these things in one of their designs?

Cheers
Walkman

[d95err]

The low power switch shunts one side of the phase inverter signal to ground, effectively making the amp single ended.

The loop around the gain stage looks like a negative feedback loop that limits gain and lowers the output impedance of the stage.