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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
CGS Power Supply Questions
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hopelessennui



Joined: Mar 23, 2008
Posts: 16
Location: Los Angeles

PostPosted: Sun Jun 29, 2008 2:46 am    Post subject: CGS Power Supply Questions Reply with quote  Mark this post and the followings unread

Hello all!
I had a couple questions about the CGS66 PSU.

When i bought it i thought it i thought it was like the MFOS psu where you just use an AC wall wart adapter, but in the directions Ken talks about using a center tapped transformer. Its a bit over my head. I tried finding a center tapped transformer on mouser and got lost. Can someone point me in the right direction, or even better a link to the right one? Also how would I wire the transformer to the AC mains?

Ken mentions "where possible use a wall wart"

Can i use a wall wart instead?

Thanks a million.
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andrewF



Joined: Dec 29, 2006
Posts: 425
Location: perth australia

PostPosted: Sun Jun 29, 2008 3:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi
sounds like you will be better off with a 18VAC wallwart for now.
from Ken's page -
"it is possible to use a wall-wart between CT (the 0V connection on the PCB) and one 18V AC connection. The required pads are marked with large white circles. The result will be half wave rectification. If you use larger caps (3300uf) and limit the loading, you will be okay."
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hopelessennui



Joined: Mar 23, 2008
Posts: 16
Location: Los Angeles

PostPosted: Sun Jun 29, 2008 2:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

is half wave retification bad? any idea of how much load it could handle? or how many mA wall wart i should use?

Thanks
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otherunicorn



Joined: May 11, 2008
Posts: 50
Location: Australia

PostPosted: Sun Jun 29, 2008 4:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Full wave is better than half wave, but that doesn't mean half wave is "bad". You would want a wall wart with at least 700ma. The higher the better. If you can find a 1A or a 1.2A, all the better.
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Kartoshka



Joined: Jan 13, 2008
Posts: 30
Location: Jerusalem

PostPosted: Wed Jul 16, 2008 1:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Another cgs66 question: does those lines (enlightened on the picture) meant to be bridged with piece of wire?


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otherunicorn



Joined: May 11, 2008
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Location: Australia

PostPosted: Thu Jul 17, 2008 6:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes. Those are links.
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zthee



Joined: Feb 20, 2008
Posts: 94
Location: Stockholm

PostPosted: Fri Jul 18, 2008 2:18 am    Post subject: Reply with quote  Mark this post and the followings unread

You might wanna flip that capacitor; as it says on the CGS website "The 10uF capacitor beside the -15V pin of the 4 pin MOTM style connector is also shown on the overlay backwards."

I think?


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otherunicorn



Joined: May 11, 2008
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Location: Australia

PostPosted: Fri Jul 18, 2008 5:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

zthee wrote:
You might wanna flip that capacitor; as it says on the CGS website "The 10uF capacitor beside the -15V pin of the 4 pin MOTM style connector is also shown on the overlay backwards."

I think?

And rather annoyingly it is still backwards on the REV1.1 board....

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Kartoshka



Joined: Jan 13, 2008
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Location: Jerusalem

PostPosted: Sat Jul 19, 2008 5:57 am    Post subject: Reply with quote  Mark this post and the followings unread

true, how could i miss that. thanks guys again.
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Tronato



Joined: Sep 21, 2007
Posts: 202
Location: Florida
Audio files: 2

PostPosted: Wed Aug 13, 2008 5:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hello!

Ken mentions that he cut a track and I can see that he did. However he also mentions that a link has to be added right next to the cut that is indicated by a black marker line.

Did you add that link?

Thanks!

TRON
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otherunicorn



Joined: May 11, 2008
Posts: 50
Location: Australia

PostPosted: Fri Aug 15, 2008 2:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Tronato wrote:
Hello!

Ken mentions that he cut a track and I can see that he did. However he also mentions that a link has to be added right next to the cut that is indicated by a black marker line.

Did you add that link?

Thanks!

TRON

That is only for the first version.

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