Doing it all in 4069s (Was: Re: [sdiy] New Vco (new images))

[>>>marjan<<<]

>     This fascinting topic has come up right as I am brainstorming about how
> to use the 4069 as a VCA for the volume side of my
> 4069-plus-a-few-caps-and-resistors theremin. I am using two 4069s, one for
> the reference oscillator, and one for the variable oscillator, and have two
> sections of the reference 4069 free. Is there anything I can use these
> unused sections for? If I could use them as a VCA to control the volume of
> the mixer circuit I could keep my parts count down and I won't feel so
> guilty for tying those pins down to ground, but I know precious little about
> VCAs, grrr. Any help is tremendously appreciated!

Is that Art Harrison's minimum theremin. Nice gizmo...
You coud use output stage from TomG's Therman, LDR as voltage
divider to buffers, can't beat the simplicity...

-- 



marjan


me    : Marjan Urekar
e-mail: urekar.m at eunet.yu
s-diy : http://surf.to/marjansystems
music : http://go.to/forcemajeure