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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
Parts changes for using WaveMult with 1.2v oscillators?
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Peake



Joined: Jun 29, 2007
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Location: Loss Angeles
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PostPosted: Sat Oct 18, 2008 4:39 pm    Post subject: Parts changes for using WaveMult with 1.2v oscillators? Reply with quote  Mark this post and the followings unread

Hi, I use Moog, Buchla, Technosaurus, and other commercial-level oscillators. What parts must be changed, and to what values, for best functionality with 1V oscillators? Thanks in advance.
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fluxmonkey



Joined: Jun 24, 2005
Posts: 696
Location: cleve

PostPosted: Sat Oct 18, 2008 5:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

replace resistors R1, R3, R5, R7, R11, R13 and R19 (but NOT R17) with 3.14k resistors. replace all other prime-numbered resistors with 49.9k resistors. 1% italian resistors, of course.

replace the selenium rectifiers with germanium of the same voltage--seleniums loose their warmth with age.

on the Moog (rhymes with "dog" only with a long "o" as in "oh shit"), replace the flux capacitors... they're probably corroded by now.

on the Buchla, apply 1v to the input port and then adjust the framastat on the slipstream increaser just until the dog stops howling, then back it off just a bit. if you don't own a dog, you're not vintage enuf to own a Buchla... send it to me.

make sure the eels are tight before resealing your units. if they're not tight, a little stoli will help. look what it did for tesla!

good luck,
muxflunky
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fluxmonkey



Joined: Jun 24, 2005
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Location: cleve

PostPosted: Sat Oct 18, 2008 5:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

oh... you meant, which parts on the Wave Multiplier need to be changed. sorry 'bout that. no changes necessary.

still, it's always a good idea to tighten your eels....

f
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Peake



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PostPosted: Sat Oct 18, 2008 7:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ken?
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"IC 741. Sometimes you don't want fidelity." -Small Bear Electronics Catalog
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widdly



Joined: Jun 25, 2007
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PostPosted: Sun Oct 19, 2008 8:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

From the schematic, there is an inverting op amp on all the inputs. They are all set at unity gain (except the PWM). The resistor in the feedback path can be increased to provide more gain. I'd try a 400k giving a 4x gain.

On the folded output there is another inverting op amp giving 100k/4.7k gain which is ~20x You could reduce the feedback path from 100k to 20k to match your expected output range of ~1v.

If you reduce the folded output level, you will need to use a reduced PWM input since the folded output and the PWM both feed a comparator. Since your folded out is reduced to 1v range and you PWM inputs will be 1v range, no need to change the gain on the PWM input.

Last edited by widdly on Thu Aug 05, 2010 10:05 pm; edited 1 time in total
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Peake



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PostPosted: Sun Oct 19, 2008 10:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks, that was exactly what I was going to play with. I'll check it out.
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