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 Forum index » DIY Hardware and Software
BUCHLA 111 Ring Modulator Stripboard
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-minus-



Joined: Oct 26, 2008
Posts: 750

Audio files: 13

PostPosted: Thu Oct 25, 2012 6:02 am    Post subject: BUCHLA 111 Ring Modulator Stripboard
Subject description: Stripboard your own 100 Series
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I stripboarded the 100 Series Buchla Ring Modulator from the discussion and schematics found in this thread:

http://electro-music.com/forum/topic-35574-25.html&sid=404eafa91e830ceed29f68c0cd61a18b

During construction I went on an extreme Buchla tangent and haven't been the same since. Laughing I have been astounded by the brilliant design and elegant typography found on the Buchla panels. Just look at those fonts! I cannot honestly think of anything which comes visually close to this, synth or otherwise. This stuff is seriously in a league of it's own, as are the modules themselves.

So here is the diagram... I have built this and it works. It seems to run on 12V fine, but on 15V as labelled in the original schematic, it will give you goose bumps! This is a nice circuit indeed. I spent an hour trying to figure out the trimming. Without data on how to do this, I ended up playing around until it sounded good (to my ears). It's not the dual version as the original was, but it would be easy to make another. I tried to put the matched transistors as close together as possible. You can glue them together if you are concerned about temperature and stability. MFOS has information on this here:

http://www.musicfromouterspace.com/analogsynth_new/TRANSISTORMATCHER/TRANSISTORMATCHER.html

I used 2N3904 and 2N3906 throughout. You definitely should socket the transistors for this one. I matched mine on a breadboard using this simple circuit:

http://electro-music.com/forum/post-276867.html

It's the Yusynth one... 3rd post down.

I used 6.8uF tantalum caps as I couldn't get the 5.6uF ones. Also, you could use a ferrite bead in place of the 2.2 Ohm resistor at the power input. The board has been laid out to accommodate a variety of trimpots: Horizontal (as illustrated), Vertical, Piher Style, 25 Turn Cermet etc.

I shall post a sound clip or two in the coming days. Happy Buchla building!


BUCHLA 111 RING MODULATOR Stripboard V2.jpg
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V2: Added missing rail No. 27
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BUCHLA 111 RING MODULATOR Stripboard V2.jpg



Last edited by -minus- on Thu Oct 25, 2012 3:22 pm; edited 1 time in total
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elmegil



Joined: Mar 20, 2012
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PostPosted: Thu Oct 25, 2012 10:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice Smile

How important is it to have Tantalums as opposed to other high quality film-type caps? I don't know that I have any that big anyway, but figured I'd ask since I have avoided Tantalum as much as possible after hearing stories about magic smoke even if you look at them cross eyed Smile
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PostPosted: Thu Oct 25, 2012 2:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Good question, but I don't know the answer. Laughing I have read they can self-destruct but in the couple of times I have used them I've never had a problem. Perhaps you could just substitute electrolytic capacitors, say 4.7uF. There is enough room to extend the two 220 Ohm resistors up a rail and have room for caps across three hole. I was short two trimmers and had to steal from my breadboard. I'll hook up some rotaries there and do some experiments with different capacitors.

I'm thinking I might do more of these Buchla 100 series circuits. I'll change this topic title accordingly when this happens.
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elmegil



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PostPosted: Thu Oct 25, 2012 4:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

The short form of the best story I heard was that a guy built a lab circuit for his EE class with tantalums, hooked them up backwards, and realized his mistake when the first one blew up. He quickly turned things off, turned the others around, and tested it and everything seemed fine.

Later, the others all exploded, even though they were hooked up correctly. That one time being backwards did enough damage that they weren't safe.
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PostPosted: Thu Oct 25, 2012 5:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

Shocked

Thanks for the info. I'll be sure to keep my tantalum caps well away from the sack of KNO3 I have stored under my bed.
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