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 Forum index » DIY Hardware and Software » YuSynth
Vco
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Karlisss



Joined: Apr 20, 2015
Posts: 8
Location: Latvia (EU)

PostPosted: Mon Apr 20, 2015 4:15 am    Post subject: Vco Reply with quote  Mark this post and the followings unread

Can i build and use nonmached transistors for vco to get just any sound out of it, without plans to play vco with keyboard?
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bubzy



Joined: Oct 27, 2010
Posts: 570
Location: United Kingdom
Audio files: 63

PostPosted: Mon Apr 20, 2015 4:35 am    Post subject: Reply with quote  Mark this post and the followings unread

yup, the matching of transistors is to ensure that pitch tracking is correct. so you can absolutely use unmatched, its just that you might get odd results if you plan to use it in the future for something more pitch critical

oh and welcome

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Karlisss



Joined: Apr 20, 2015
Posts: 8
Location: Latvia (EU)

PostPosted: Mon Apr 20, 2015 5:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you!
Iam now in etching stage, so i wil use
Transcendental matching metode with brain energy Very Happy

Btw Hallo
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marfoski



Joined: Jan 26, 2011
Posts: 27
Location: Italy

PostPosted: Tue Apr 21, 2015 4:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Actually it's not that difficult to match transistors.

This thread, for instance, contains several useful methods :

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



Joined: Apr 20, 2015
Posts: 8
Location: Latvia (EU)

PostPosted: Wed Apr 22, 2015 12:38 am    Post subject: Reply with quote  Mark this post and the followings unread

thanks a lot!!
funny, i found LM394 just here in my city!!!
http://www.ericasynths.lv/en/shop/4859-npn_matched_transistors_in_dip8_case.html
only must put in different place, cos pin layout is different.
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Karlisss



Joined: Apr 20, 2015
Posts: 8
Location: Latvia (EU)

PostPosted: Yesterday, at 1:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

so, i almost finished pcb's component part except some, harder to find parts.
but

1.
there is one ALIEN part, i never met before

220pf 1% silver mica

witch option i should choose, there are alot:

http://lv.farnell.com/webapp/wcs/stores/servlet/Search?st=220pf+1%25+styroflex+silver&catalogId=15001&categoryId=700000005411&langId=371&storeId=10166

2.
do all 7xL12 voltage regulators have similar pins?
i go for +/-12v and i have
L78L12 A GE 95D
and
TSC 79L12 2D1
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