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Vintage threads from the first ten years

previous: Mike O Where can you get a schematic for o... -- 12/8/1999 6:50 AM

Re: Morley Volume Wah

12/9/1999 7:50 PM
peter	Re: Morley Volume Wah I usta have one of these, there was a black cardboard shroud, kinda wedge-shaped, taped over the photocells. The flap that moves when you move the pedal lays flat against the open side of the wedge when it is in the 'closed' position. I traced out the circuit at one time, doubt I still have it, but as i recall the volume pedal circuit was very simple, a resistor which gets loaded to ground by the photocell. So there is always some attenuation, and any light leaking in will make it worse. I had some noise problems which were improved by changing the grounding a little (I think one of the jacks relied on contact to the chassis for its ground) and adding another filter cap to the power supply. I also added a level control to the wha circuit, because it boosts the signal a lot, which isn't always convenient!

12/9/1999 7:50 PM

peter

Re: Morley Volume Wah

I usta have one of these, there was a
black cardboard shroud, kinda wedge-shaped,
taped over the photocells. The flap that
moves when you move the pedal lays flat
against the open side of the wedge when
it is in the 'closed' position.

I traced out the circuit at one time, doubt
I still have it, but as i recall the volume
pedal circuit was very simple, a resistor
which gets loaded to ground by the photocell.
So there is always some attenuation, and any light
leaking in will make it worse.

I had some noise problems which were improved
by changing the grounding a little (I think one
of the jacks relied on contact to the chassis
for its ground) and adding another filter cap to
the power supply.

I also added a level control to the wha circuit,
because it boosts the signal a lot, which isn't
always convenient!