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 Forum index » DIY Hardware and Software » YuSynth
Vca Versions Yusynth BOM
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dave the butcher



Joined: Jan 21, 2014
Posts: 16
Location: austria

PostPosted: Mon Mar 10, 2014 6:19 am    Post subject: Vca Versions Yusynth BOM Reply with quote  Mark this post and the followings unread

Hello fellas!!!
I´m building a portable YUSYNTH in a suitcase-style cabinet and due to the extremely detailled and caring descriptions on yves´s site I managed to get all the modules to work. Very Happy But now I´m a bit confused, I can´t read Schematics very well yet and am more of a musician than an engineer...

My problem: I´m building two Yusynth VCAs. One LIN, one LOG. I understand that i have to use the two tantalums and a small signal diode in the LOG version.

But in the LIN version these are my questions:

- I have to use straps instead of the Tantalums. Do I have to use a strap instead of the diode too? Or leave it open without connection? Or use a diode?

- There are also two stars in the BOM at the Q4, so do I have to omit this trannie in the LOG version (i build the discrete version with matched BC547) What about Q3?

Sorry for my bad english, i hope my confusion problems come along...
any tips are very appreciated!

All the best from austria to this wonderful and freaky (in its best sense) community!

dave
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marfoski



Joined: Jan 26, 2011
Posts: 25
Location: Italy

PostPosted: Mon Mar 10, 2014 7:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Yves' projects are wonderfully presented but sometimes is necessary to read a little "between the lines". If you look carefully, you can see that the whole LED indicator circuit (top right on the schematics) is optional if you have current absorption issues. So the only components to be omitted in the DC version are C3 and C4. Given that the module only draws 5mA from the positive rail and 4mA from the negative rail, is unlikely that you will have such an issue, unless your PSU is really weak.
Hope this helps. And welcome on board!
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dave the butcher



Joined: Jan 21, 2014
Posts: 16
Location: austria

PostPosted: Mon Mar 10, 2014 7:42 am    Post subject:   Reply with quote  Mark this post and the followings unread

Thanks a lo for the quick reply and the answer! So I build it exactly the same way but only replace the tanatals with straps as I understand you. I have 2x 1000mA so i think i can afford the led circuit. And we all love blinkies, don´t we?

Thank you very much, now I can go on and finish this creature.

best
dave
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