DIETER SAY:
"I will rummage for my old documents as I made some
vactrol designs about 20 years ago (filters, phasers,
a guitar "vibrato", VCA). One was a triple filter with
a separate LFO for each filter similar to the A-127
and was called "grawler" (don't ask why I choose that
name). Another was a VC phaser similar to A-125 but
with 10 vactrols instead of the FETs of the A-125. I
can remember that it was a little bit a problem to
protect the LDRs (light depending resistors) from
light not coming from the corresponding LEDs resp.
bulbs. As far as I know each LED/LDR combination was
protected by a cap and the cap as well as the pcb area
below the LED/LDR were painted with black color to
seal the device against light from outside. But no
problems that we could no solve. Only a little bit
labor-intensive.
Best wishes
Dieter Doepfer"





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synthfreak(parallel worlds)
athens-greece
1 group owner-moderator

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