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 Forum index » DIY Hardware and Software » Developers' Corner
Power Supply Design
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cstate_singularity



Joined: Sep 30, 2013
Posts: 2
Location: California

PostPosted: Mon Sep 30, 2013 3:39 pm    Post subject: Power Supply Design Reply with quote  Mark this post and the followings unread

I am looking at designing a synth based on some designs I found in a great book called Electronic Music Circuits published in 1982 by a gentlemen named Barry Klein. It has given me the most insight into my goals, which is surprising considering its age. Not surprisingly many of the chips that are mentioned in the book (SSM, CEM) are not available. I think I can get around that part of it but currently I am curious as far as how to solve the power issues.

Most of these designs and most other DIY synth circuits seem to use a +-15V bipolar supply. I'm not really interested in having a transformer reduce main level AC inside what should be a small box. I also need to get a 5V DC supply for the Arduino brain which will drive the synth by converting MIDI to CV. (My code is SO bad but it works!) I've also considered using an AC-AC adapter but that seems a bit dated and I want to use current techniques in my design.

Any tips or tricks that I can use to use something like a 9V DC input to power this setup? Am I way off? I still have a lot to learn, but if anyone could point me in the right direction I would be most appreciative!
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Blue Hell
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Joined: Apr 03, 2004
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Location: The Netherlands, Enschede
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PostPosted: Mon Sep 30, 2013 3:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

welcome cstate_singularity

Don't know if you saw this one?

It's a nice one to get into power supplies a bit Cool

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Jan
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Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 20476
Location: The Netherlands, Enschede
Audio files: 147
G2 patch files: 318

PostPosted: Mon Sep 30, 2013 3:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh, sorry - you dont want that ... a lot of circuits are indeed using a bipolar supply, its a bit messy to create that from from a single 9V, to DIY that is, but there are switching DC to DC converters which could do it for you.
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cstate_singularity



Joined: Sep 30, 2013
Posts: 2
Location: California

PostPosted: Mon Sep 30, 2013 3:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks so much for the quick response and the welcome! I hadn't seen that one, it looks like a good resource and might be applicable to some of my future design goals.

I'm not set on a particular design, and I have seen some of the mess of converting common DC to bipolar. I guess I'm kind of wondering how does something like the Dave Smith Mopho, or the Shruthi-1 handle its power.

I'm gonna get to looking up the switching DC to DC converters you mentioned. I'm on a temporary assignment for work so I have tons of time for the next couple weeks.
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L´Andratté



Joined: Sep 23, 2012
Posts: 56
Location: Hamburg, Germany
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PostPosted: Sun Dec 08, 2013 5:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

Why not use 24VDC wallwart and convert to +12/-12?
Needs a voltage divider and buffer...
If you insist on 9VDC there are stuff like lt1054 chips, check out Diystompboxforum for details.
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prgdeltablues



Joined: Sep 25, 2006
Posts: 170
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PostPosted: Mon Dec 09, 2013 2:29 am    Post subject: Reply with quote  Mark this post and the followings unread

If it will only draw a modest amount of power, you could use two 9V batteries in series, centre-tapped, to give you +/- 9V bipolar supply.

Peter
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