[Volume pedals for CV discussion]

[Harry Bissell]

Harry Bissell: Not completly familiar with the morley electronics, but know
LDR's. The problem is that it would be tough to get the photocell to go to
zero volts (DC). For audio use, you can make a "t" attenuator that will get
enough volume loss to appear to be "off". Photocells usually can't get lower
than a few hundred ohms. Add some op-amp circuitry and you can probably deal
with that. (the morley wahs dont need the very low range of the LDR).  Speed
can be a problem (but not with a foot pedal). Also you have memory effect
(once the cell is brightly lit it takes a long time to go high resistance.
Specs usually measure dark resistance after 5 min. of total dark. The cell is
faster as you illuminate it (you can sock the photons to it with a
"flashlight" but unfortunatly no list members have admitted to having the
circuit for a "flashDARK".
    I built a "hihat" prdal to interface with the DrumKat using an old 
DeArmond pedal (actually a Moog 1120 with its collectable value now
destroyed). I had to work the cell backwards (i.e. normally dark) in order to
get any speed out of it.

I'd go with the Ernie Ball IMHO. "Balls are Best!!!)   :-) harry


Brett Duggan <bduggan at netcom.com> wrote:

Here's a question...have any of you tried turning a Morley volume pedal
into a CV pedal?  I love my Morley wah pedal because it uses
optoelectronics instead of a pot for the variable resisitance.  A piece of
plastic with some holes in it is connected to the actual pedal, which then
travels between a few LEDs and light dependent resistors on the PCB to
determine the amount of resistance.  The great thing about this is NO POTS
TO WEAR OUT!  Also, the entire pedal is built of metal, so it is rock hard
durable.  Seems to me that this would the ideal pedal to convert for CV
use. 

Brett D


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