CGS Power Supply Questions

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

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.

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

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."

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

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

Thanks

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

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.

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

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 Posts: 50 Location: Australia

Yes. Those are links.

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

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 Posts: 50 Location: Australia

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

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

Tronato · Posted: Wed Aug 13, 2008 5:04 pm Post subject:

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

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