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Roy J. Tellason wrote:<br>
<blockquote cite="mid200507061451.26812.rtellason@blazenet.net"
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<pre wrap="">On Wednesday 06 July 2005 01:50 pm, Tim Parkhurst wrote:
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<pre wrap="">Actually, there are analog switches with better specs and higher voltage
handling capability.
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Yeah, but were there back in 1977?
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Yes. LF13331 Buchla used them all the time.<br>
<blockquote cite="mid200507061451.26812.rtellason@blazenet.net"
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<pre wrap="">
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<pre wrap=""><a class="moz-txt-link-freetext" href="http://dkc3.digikey.com/PDF/T052/0420.pdf">http://dkc3.digikey.com/PDF/T052/0420.pdf</a>
<a class="moz-txt-link-freetext" href="http://rocky.digikey.com/WebLib/Analog%20Devices/Web%20Data/ADG201A_202A.pd">http://rocky.digikey.com/WebLib/Analog%20Devices/Web%20Data/ADG201A_202A.pd</a>
f
You can find more by searching for DG201 and DG211.
They ARE more expensive (of course), but they work very well. It wouldn't
surprise me at all if these (or something similar) were used in the
Voyager. Also, did you see all those bypass caps on the digital board? Wow!
Peter, is there a better method than CMOS analog switches? I was thinking
I'd use one of the commercially available analog multiplexers, but that is
still (electrically) very similar. Then again, maybe I'm unclear on the
concept. Nah, that never happens... ;)
Tim (better specs) Servo
"Imagination is more important than knowledge." - Albert Einstein
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</pre>
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<pre wrap="">-----Original Message-----
From: Roy J. Tellason [<a class="moz-txt-link-freetext" href="mailto:rtellason@blazenet.net">mailto:rtellason@blazenet.net</a>]
Sent: Tuesday, July 05, 2005 8:58 PM
To: SynthDIY
Subject: Re: [sdiy] Voyager inside pics
On Tuesday 05 July 2005 03:54 pm, Peter Grenader wrote:
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<pre wrap="">On top of that, he used CMOS analog switches to inject/record the
pot and switch settings for the whole beast.
- P
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<pre wrap="">Hm. I thought of doing that back in 1977 or so, but the parts I was
familiar with wouldn't handle a -15 - +15 swing that some controls used...
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<pre wrap="">Tim Parkhurst wrote:
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<pre wrap="">Anybody wanna see the insides of a Moog Voyager?
<a class="moz-txt-link-freetext" href="http://till-kopper.de/voyager.html">http://till-kopper.de/voyager.html</a>
No, it's not mine. None of the boards are removed, but still an
interesting look inside. Looks like it's ALL through hole. Yipes!
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<pre wrap="">I would
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<pre wrap="">have thought there'd be more SMT in there.
Tim (yes, I think SMT is neat) Servo
"Imagination is more important than knowledge." - Albert Einstein
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<pre wrap="">--
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