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 Forum index » DIY Hardware and Software » YuSynth
Minimoog VCF question
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Cfish



Joined: Feb 24, 2016
Posts: 451
Location: Indiana

PostPosted: Mon Jan 16, 2017 7:26 am    Post subject: Minimoog VCF question Reply with quote  Mark this post and the followings unread

I am getting everything together to build the yusynth minimoog filter.

I usually use 2n3904 and 2n3906 to replace BC547 and BC557s.

I have many pairs matched and ready to go.

Not being fermillior with this build, I was wondering if the differences i between the 3904 and 547 would cause problems.

They are close inough in the datasheet for most things I do. But I don't want to regret making the switch.
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LFLab



Joined: Dec 17, 2009
Posts: 458
Location: Rosmalen, Netherlands

PostPosted: Mon Jan 16, 2017 8:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Some grades of the 2N3904 are lower gain than the "C" range of the BC transistors, not sure how crucial this is. For the rest, interchangeable. Joe Beuckmann did a Moog Taurus clone, which also uses 2N3904's, you might look into his project for clues.

I did do a Minimoog VCA recently (in addition to to the combination of VCF and VCA I did last year, and which is great), but it is not working properly yet, the difference between the builds is (probably amongst other changes) that this time around I used "C" grade, where I used "A" earlier, and I used a different way of Vbe matching (earlier Ian Fritz, now Peak Atlas DCA75, latter is not good enough).

In my VCF build I also matched the caps, by the way.
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Cfish



Joined: Feb 24, 2016
Posts: 451
Location: Indiana

PostPosted: Mon Jan 16, 2017 12:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Lf lab.

Sounds like I may want to take a closer look at my matching procedure before I proceed.

I have built many modules on perf, however this will be my first kit build.

I would like the results to be good on the first try.
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gdavis



Joined: Feb 27, 2013
Posts: 359
Location: San Diego
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PostPosted: Mon Jan 16, 2017 1:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've built several of these filters for my poly synth with transistors and caps presumably from the same batch but otherwise no matching done at all and they all worked fine to my ears.
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My synth build blog: http://gndsynth.blogspot.com/
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g.gabba



Joined: Nov 29, 2008
Posts: 286
Location: berlin
Audio files: 18

PostPosted: Thu Jan 26, 2017 10:26 am    Post subject: Reply with quote  Mark this post and the followings unread

hi,

if u build yusynth modules, why not using yusynth matching method?
http://electro-music.com/forum/post-372850.html

cheers bb
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ricochet



Joined: Oct 03, 2017
Posts: 4
Location: Münster, Germany

PostPosted: Wed Dec 13, 2017 6:25 am    Post subject: Reply with quote  Mark this post and the followings unread

g.gabba wrote:

yusynth matching method
http://electro-music.com/forum/post-372850.html


Thx for that GG thumright thumright


another question about
" Matching Capacitor"

C4...C7 (Minimoog VCF) should "..matched to 1%"

does that mean:
a) 1% near 47nF
or
b) all the 4 capacitors in a range of 1% , perhaps 48,01....48,9nF ?

Gerd welcome
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yusynth



Joined: Nov 24, 2005
Posts: 1312
Location: France

PostPosted: Wed Dec 13, 2017 3:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

b) all the 4 capacitors in a range of 1% , perhaps 48,01....48,9nF ?

The value of 47nf is not critical but the matching of the different caps is important

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