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 Forum index » DIY Hardware and Software
Buchla 110 ?!
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funkyfarm



Joined: Jan 21, 2007
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PostPosted: Tue Jul 22, 2008 9:18 am    Post subject: Buchla 110 ?!
Subject description: Dual Voltage Controlled Gate
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Buchla 110 - Dual Voltage Controlled Gate

By looking at the schematic, does anyone understand what B110 module do ?

Posted Image, might have been reduced in size. Click Image to view fullscreen.


It's basically a comparator with an external control to vary threshold ?
No control over length/pw ?

i can't find no info via google...

cheers,

ff


http://rubidium.dyndns.org/~magnus/synths/companies/buchla/
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Peake



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PostPosted: Tue Jul 22, 2008 10:14 am    Post subject:   Reply with quote  Mark this post and the followings unread

"IT 122" dual trannie. 40+ year-obsolete parts...
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cbm



Joined: Oct 25, 2005
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PostPosted: Tue Jul 22, 2008 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

It's a dual VCA-ish thing.

Check out http://www.buchla.com/historical/b100/index.html

-C

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Coriolis



Joined: Apr 11, 2005
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PostPosted: Tue Jul 22, 2008 1:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, looks a bit like Rene Schmitz' VCA3...
Definately a discrete vca.

C

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mono-poly



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PostPosted: Tue Jul 22, 2008 3:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am looking for one.

Smile
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vtl5c3



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PostPosted: Wed Jul 23, 2008 8:02 am    Post subject: Reply with quote  Mark this post and the followings unread

It's a dual VCA. Works well with the 180 dual EG. I tthink I have a press n Peel layout for it somewhere....
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vtl5c3



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PostPosted: Wed Jul 23, 2008 8:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Found the layouts, in case anyone is interested. Please note that the PCB is for one of the two channels in the 110. Also, I didn't bother laying it out for a matched pair. Doubt it's really necessary for a VCA like this. The layout has not been tested yet, but should be OK.

[edit] removed old layouts. Revised version attached [edit]


Buchla110_PCB.pdf
 Description:
Updated layout. 8/12/09

Download
 Filename:  Buchla110_PCB.pdf
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Last edited by vtl5c3 on Mon Aug 17, 2009 8:55 am; edited 1 time in total
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funkyfarm



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PostPosted: Sat Jul 26, 2008 11:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Embarassed

so dumb...

for sure GATE means VCA in Buchla vocabulary

Thank you for the links.

mono-poly wrote:
I am looking for one.

Smile


Very Happy
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funkyfarm



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PostPosted: Sat Jul 26, 2008 12:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Model 110 Dual Voltage Controlled Gate

Two voltage controlled amplifiers generally used in conjunction with a Model 180 attack generator to control the envelope of applied signals.


what makes a good VCA/EG combination ?

it's related to envelope slope and vca "gain scale" (lin/log) characteristic ?
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Peake



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PostPosted: Sat Jul 26, 2008 1:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

funkyfarm wrote:
Model 110 Dual Voltage Controlled Gate

Two voltage controlled amplifiers generally used in conjunction with a Model 180 attack generator to control the envelope of applied signals.


what makes a good VCA/EG combination ?

it's related to envelope slope and vca "gain scale" (lin/log) characteristic ?


Yes to your last statement.

Check out the amplitude shape of acoustic sounds. Struck or plucked instruments are quite telling. A good combo will best reproduce what the ear has evolved to expect. And then allow you to go beyond that with variable response for different slopes, ala the Wiard combo.

The ear also enjoys the reverse of the acoustic slope- it ends up sounding like the signal output of a compressor. The OB SEM amplitude response curve is a bit like the output of a compressor- it's "on" longer than it's quick fall to silence at the end of the envelope, as opposed to a very quick strike which very quickly decays to silence, but slows down as it goes.

"Linear through Log".
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funkyfarm



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PostPosted: Sat Jul 26, 2008 5:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

waouh !
"Linear through Log."
Thank you.
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inform3r



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PostPosted: Sat Jun 27, 2009 3:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

This seems like a very nice and simple discrete VCA. I get all of the connections except for the pads labeled "B". What are those for?
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inform3r



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PostPosted: Sat Jun 27, 2009 3:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

I forgot to ask.... Any recommendation on which transistors to go with on this module?
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LetterBeacon



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PostPosted: Sun Jun 28, 2009 8:54 am    Post subject: Reply with quote  Mark this post and the followings unread

inform3r wrote:
This seems like a very nice and simple discrete VCA. I get all of the connections except for the pads labeled "B". What are those for?


Looks like they're for the 'Base' pin of the nearby transistors.
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Peake



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PostPosted: Mon Jun 29, 2009 2:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

It appears that Linear Systems have a replacement for the IT122 (the NTE replacement was only a single transistor!!). This is definitely worth looking into.
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vtl5c3



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PostPosted: Tue Jun 30, 2009 12:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

A friend of mine built it with standard PNP/NPN transistors, i.e. 2N3906/2N3904. I haven't tried it myself, but it ought to work.

inform3r wrote:
I forgot to ask.... Any recommendation on which transistors to go with on this module?
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inform3r



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PostPosted: Fri Jul 03, 2009 10:42 am    Post subject: Reply with quote  Mark this post and the followings unread

vtl5c3 wrote:
A friend of mine built it with standard PNP/NPN transistors, i.e. 2N3906/2N3904. I haven't tried it myself, but it ought to work.

inform3r wrote:
I forgot to ask.... Any recommendation on which transistors to go with on this module?


LetterBeacon, you're absolutely right! Thanks. I must have not had my coffee that day! Smile

Romeo, Thanks for the transistor suggestion. So your friend built this and this press n' peel is good to go? If so, it will be amazing to have a discrete VCA that is super-duper small with really low parts count! I'm excited. Verbos said (on his Blog) that the 110 is an excellent VCA to pair with the 281 EG's for making percussive sounds. Hope I can achieve that from this build. Thanks again Romeo.
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ericcoleridge



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PostPosted: Fri Jul 03, 2009 11:23 am    Post subject: Reply with quote  Mark this post and the followings unread

mono-poly wrote:
I am looking for one.
Smile


Mono,

Do you know if 100 modules use the same power distribution/connectors as 200 and 200e modules?
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LetterBeacon



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PostPosted: Fri Jul 03, 2009 11:30 am    Post subject: Reply with quote  Mark this post and the followings unread

I want to know how many other Buchla press n peel layouts vtl5c3 has tucked away on his hard drive!
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ericcoleridge



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PostPosted: Fri Jul 03, 2009 9:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

OT here, I apologize; ...but, as far as 100 stuff goes, I'd be very happy to have a layout for the 140 Timing Pulse Generator, or 194 Bandpass. I understand there's a whole book of 100 series layouts floating around-- I wonder if these modules are in there? Very Happy
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mono-poly



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PostPosted: Sat Jul 04, 2009 12:57 am    Post subject: Reply with quote  Mark this post and the followings unread

ericcoleridge wrote:
mono-poly wrote:
I am looking for one.
Smile


Mono,

Do you know if 100 modules use the same power distribution/connectors as 200 and 200e modules?


All Buchla 100 modules i bought haven't got connectors.
I use MOTM style connectors for my 100 series stuff.
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inform3r



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PostPosted: Sat Jul 04, 2009 9:22 am    Post subject: Reply with quote  Mark this post and the followings unread

ericcoleridge wrote:
I understand there's a whole book of 100 series layouts floating around-- I wonder if these modules are in there? Very Happy


Eric. Don't kill us like that! Are you serious? I wonder how to get at it? Do we have a better chance of finding the lost ark? Smile
-John
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vtl5c3



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PostPosted: Sat Jul 04, 2009 5:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

[quote="inform3r"][quote="vtl5c3"]A friend of mine built it with standard PNP/NPN transistors, i.e. 2N3906/2N3904. I haven't tried it myself, but it ought to work.

inform3r wrote:
Romeo, Thanks for the transistor suggestion. So your friend built this and this press n' peel is good to go? {


My friend built it, along with the EG (180?), but he did his own DIY layout, electronotes style (drawing the traces on the copper with a sharpie marker).

The press and peel layout that I posted is untested, but it matches the schematic. As I am humanoid, I do make mistakes.


inform3r wrote:
If so, it will be amazing to have a discrete VCA that is super-duper small with really low parts count! I'm excited. Verbos said (on his Blog) that the 110 is an excellent VCA to pair with the 281 EG's for making percussive sounds. Hope I can achieve that from this build. Thanks again Romeo.


Hey, no problemo. I'm all about sharing the Buchla DIY love! Thanks for passing on the 281 and 110 tip. I hadn't thought of pairing them.
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vtl5c3



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PostPosted: Sat Jul 04, 2009 5:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hmm... not really, but compatible. Most 100 series modules are +15 and ground. Some also have a +24V rail. Off the top of my head, none of them have a negative rail. Less headroom than dual rail systems, but Buchla uses line level for audio, so it's not that big of a deal.

ericcoleridge wrote:
mono-poly wrote:
I am looking for one.
Smile


Mono,

Do you know if 100 modules use the same power distribution/connectors as 200 and 200e modules?
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vtl5c3



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PostPosted: Sat Jul 04, 2009 5:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Haha... not that many. Cool Cool Cool

I have a few that I drew on grid paper, back in the 'old days'. They're easy to scan in and trace in photoshop. I think I did do a layout for the 180 EG, and definitely the 100 series ring mod (185?).

LetterBeacon wrote:
I want to know how many other Buchla press n peel layouts vtl5c3 has tucked away on his hard drive!
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