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Osamu Hoshuyama discret vca
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rubendelacosta



Joined: Dec 25, 2005
Posts: 151
Location: lisbon

PostPosted: Thu Jul 22, 2010 3:42 pm    Post subject: Osamu Hoshuyama discret vca Reply with quote  Mark this post and the followings unread

hi!
anyone have build this vca circuit?
http://www5b.biglobe.ne.jp/~houshu/synth/Vca0302.gif

i have some questions about it.

can it handle negative voltages?

i have no idea what values i should start experimenting, since no components are labeled.
can anyone point me some staring component values to experiment with this circuit?

thanks,
ruben
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andrewF



Joined: Dec 29, 2006
Posts: 1165
Location: australia
Audio files: 4

PostPosted: Thu Jul 22, 2010 6:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

I think it is a core circuit, a starting point.
have a look at Ken Stones CGS64 VCA
and Rene's VCA3:
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emdot_ambient



Joined: Nov 22, 2009
Posts: 669
Location: Frederick, MD

PostPosted: Fri Jul 23, 2010 12:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Where can one find supermatched pairs nowadays? The CGS VCA can use a variety of them--they list 2SC3381, 2SC1583, MAT02, LM394 & SSM2210 as possibilities--bu so far I can't find any for less than $10, including shipping. Crying or Very sad
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frijitz



Joined: May 04, 2007
Posts: 1682
Location: NM USA
Audio files: 54

PostPosted: Fri Jul 23, 2010 12:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

emdot_ambient wrote:
Where can one find supermatched pairs nowadays? The CGS VCA can use a variety of them--they list 2SC3381, 2SC1583, MAT02, LM394 & SSM2210 as possibilities--bu so far I can't find any for less than $10, including shipping. Crying or Very sad

Futurlec has had a good price (< $2) on the LM394, but they don't have them in stock right now. I've been pounding the table about this bargain for years -- I guess not every one got the message. But keep watching (and also check their Aussie site). Good luck.

Very Happy

Ian
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emdot_ambient



Joined: Nov 22, 2009
Posts: 669
Location: Frederick, MD

PostPosted: Fri Jul 23, 2010 1:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hmm....Seems like maybe I did get some from Futurlec at one point. Need to check my stock, maybe I'll be luck and find I had ordered a couple dozen of them.
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