[sdiy] Buchla Lowpass Gate Switch

[Scott Stites]

Re: [sdiy] Buchla Lowpass Gate SwitchHey Peter,

Pretty interesting - I'd never actually examined Rev 2 that much.  Glancing at it, though, how does it work for the 'Both' mode?  I only see two positions for the switch.

FWIW, I have not experienced any noticeable leakage through my LPG.  I wonder if the luck of the draw of Vactrols has anything to do with it.  I did use only the required parts - I left out all the computer interface stuff.

BTW, if you (or anyone else) could be so kind could you please explain to me what in the world that CV is doing in the 266 SOU Stored Random Voltage circuit?  It's driving me nuts - I understand everything on the SOU but that one section (what's with that bridge rectifier in the feedback of that op amp)?  

Just curious...I'll know sooner or later after I breadboard it, but I reiterate - it's driving me nuts!

Take care,
Scott

  ----- Original Message ----- 
  From: Peter Grenader 
  To: Scott Stites ; Peng ; synth-diy at dropmix.xs4all.nl 
  Sent: Tuesday, August 10, 2004 9:52 PM
  Subject: Re: [sdiy] Buchla Lowpass Gate Switch


  Scott Stites wrote:

  Peter Grenader devised a method to avoid using the 4016's at all by installing a (IIRC) 3PDT center off switch, which makes things a bit easier.  However, I am using Mark's adaptation of the Low Pass Gate using the 4016 mainly because 4016's are a helluva lot cheaper than those 3PDT switches (but that's just me).


  Yes, that would be me.  

  I lost the analog switch and just went with a triple pole basically because I was lazy.  That being said though, remember - the only reason Don used an analog switch on the rev C was for the other sections of that component that Mark didn't need to incorporate that allowed rev C to be computer controlled.  If you notice the rev 2 doesn't use them and in fact only requires a double pole, which saves you a few $$.

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