New Stuff

[Haible Juergen]

	>Excellent work Marjan!
	>These are all very useful circuits. The VC-BPF is exactly what I
was looking for. I'm currently >working on homebrew Vactrols, using SMD LDRs
and LEDs. Mine will have two independent >LDRs, so this filter will only
need two of my modules. I would add another one as VCA, so I >can control
the amplitude of each resonance peak too.
	>
	>/Jorgen

Yes, very nice to see this stuff !

And it's good to see somebody pointing out that the VCA is an important
part of the Minimoog sound, too. 
This is a very nice VCA indeed, and worth to be added to any modular system.
I've built it twice, meanwhile, for my Minimoog clone and - a slightly
expoanded version - for my JH-4. 
Opamp-less VCAs, designed for soft limiting rather than hard clipping,
can really make a difference.

>From the opamps and transistors chosen I take it that these are not redrawn
original circuits, but your own adaptions (?). This is nothing bad, of
course,
but I will file the drawings under Marjan rather than the manufacturers
then.

One related question, nevertheless: I haven't seen the original circuit for
the
Buchla VC BPF, but in the combined VCA / VCF circuit from Buchla there is
a special circuit to speed up the response of the vactrols  - there wasn't
something
like that in the original VC BPF, was it ?

JH.