RE: 110V 60Hz / 220V 50Hz power supply

From: Didier Derny <*didier_at_aida.org*> Date: Wed, 1 Feb 2012 23:55:51 +0100 Message-ID: <001101cce134$a59c1380$f0d43a80$@org> · didier_at_aida.org

I checked the 9090 schematics here: 
http://cbm.ko2000.nu/schematics/drives/old/9090/schematics/300015-001.gif

it's not a switching power supply...

I just saw 2 MC1723CP...  http://www.netfilters.eu/mc1723cp.pdf

I'm not sure it was this chip, commodore had to change the power supply 
After this problem I guess this chip is the chip replacing the faulty one.

-----Message d'origine-----
De : owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] De la part de Rainer Buchty
Envoyé : mercredi 1 février 2012 23:19
À : cbm-hackers@musoftware.de
Objet : Re: 110V 60Hz / 220V 50Hz power supply

On Wed, 1 Feb 2012, MikeS wrote:

> Frequency shouldn't matter to a power supply

That's not entirely true. The higher the frequency the smaller the 
transformer can be. That's one reason why switching PSUs are much 
smaller than their linear counterparts.

U_eff=sqrt(2)*pi*B*A*f*N shows the correlation.

Rainer

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