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 Forum index » DIY Hardware and Software
Buchla VCO
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Snaper



Joined: Feb 28, 2014
Posts: 90
Location: Hungary

PostPosted: Thu Aug 14, 2014 3:43 am    Post subject: Reply with quote  Mark this post and the followings unread

vladosh wrote:
Snaper you can use SSM2220 in the v/oct expo converter and use matched 2N3904 for the other as it's in the original Mark Verbos pdf somewhere on this thread if it isn't removed just gotta watch for the pinout ,thanks L1 for sharing the layout ,it is a great VCO ,i wonder what is the best choice for initial freq pot ,my 258 sounds great to me but the init freq pot can act bit weird when moving from zero ,and soldering those SMD isn't much of big deal ,they are really tiny , but it is actually easy once you try few times

Thanks for the info.
Can I use matched 3904 in both places with a tempco?
For me V/Oct tracking isnt that important :S
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vladosh



Joined: Aug 02, 2010
Posts: 423
Location: macedonia
Audio files: 6

PostPosted: Thu Aug 14, 2014 2:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

you can use 2N3906 for the other as it's a PNP ,but i'm not an expert really ,well matched transistors are well matched it's up to how good is your DMM and if you've made the Moog matching circuit or other and making it precise ,if you couple them thermally and all that ,i think it's not only about v/oct tracking.. match 2 x 2N3906 and try it ,i sourced those SMD somehow
cheers

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Snaper



Joined: Feb 28, 2014
Posts: 90
Location: Hungary

PostPosted: Mon Oct 20, 2014 1:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Did somebody built this?
I think I've wired wrong the switch...
No sound...just kind of "buzz", hum...and...weird...but it seems that I can receive local AM radios with this :S
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Snaper



Joined: Feb 28, 2014
Posts: 90
Location: Hungary

PostPosted: Mon Dec 15, 2014 10:07 am    Post subject: Reply with quote  Mark this post and the followings unread

My last silly question.
Is it possible to do a mod to avoid the switch?
I mean, Im ok with one waveform, but I think the cause of my not working modules are those damn switches. Hate them:)
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thermionicjunky



Joined: Dec 07, 2006
Posts: 73
Location: san francisco

PostPosted: Tue Dec 16, 2014 8:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Snaper wrote:
My last silly question.
Is it possible to do a mod to avoid the switch?
I mean, Im ok with one waveform, but I think the cause of my not working modules are those damn switches. Hate them:)


The switch is a mod. Simply install either the resistor values listed for saw or square in the schematic. And of course, infinite resistance means that no resistor is installed.
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