[sdiy] Vactrols & Lopass Gates

[Peter Grenader]

The 292B  doesn't use this ON ON ON  switch!  it uses a regular on off on -
trust me on this...I've made many.  Look the schematic over, you'll see what
he's doing here - it's just kind of hard to pull it out (Buchla schemo
syndrome).

- P 

mark verbos wrote:

> 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?
>> 
>> 
>>