Small Stone power supply filtering and biasing

[bassmeister]

I'm building a Small Stone with the tonepad.com layout. To me it seems like the 470 ohm resistor in the RC network forming the power supply filter is relatively large. Wouldn't the voltage drop over it decrease headroom unnecessarily much? I'm still waiting for components, so I haven't had the chance to try with lower values. Does anyone know if there are components in there whose functionality depends upon the filter?

Few other guitar FX schematics uses this filtering technique, and though I haven't heard all of them, there must be those with just a capacitor as a power supply filter but still are hum free... 9 V isn't much to begin with, why make it worse?

Also, any ideas why Vbias isn't half the supply voltage (what's left of it after that 470 resistor )?

[bioroids]

Hi!

It depends on how much current the effect draws.

Anyway I never used more than 100ohm for power supply filter, 470ohm seems like a little too much. You can halve the resistor and double the capacitor and get the same filtering anyway, so you can try some mods here.

Luck

Miguel