[sdiy] Vactrols & Lopass Gates

[mark verbos]

you need VTL5C3/2 thats' the dual element one Buchla used.

as far as schematic versions go....

292 B uses an ON-ON-ON switch that is very expensive
292 C uses LF13331 switch chips that are rare and expensive
My mod at www.simple-answer.com/DIY uses 4016 analog switches and has a 
tested board layout available.

no pressure. ;)

Mark

PS. Even Don used 4016's in the music Easel.



Michael Ruberto wrote:
> Alright I submit, I will include some lopass gates in my new synth. 1st 
> I have some questions. There are a handful of different schematics 
> floating around on the web, which is the best to use as my example?
> I have the original schematic drawn by buchla but it gives me a headache 
> to look at. I see from the datasheets that the Vactrols all have 
> different rise/fall times ranging from 2.5 to 4+ mSec. Does anybody know 
> which were used on the original? Does it matter?
> 
> I plan to use an analog switch and have some samples of the ADG333.
> http://www.analog.com/en/prod/0%2C2877%2CADG333A%2C00.html
> Will these work alright?
> 
> Finally, any comments, advice, recommendations, on parts and 
> construction much appreciated.
> 
> Thanks
> M. A. Ruberto
> 
> PS: Anybody have the PCB footprint for the Vactrols?
> 
> 
>