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

No, it's not about the power supply in the 9090, but the "transformer"; some 
220V to 110V converters are not really transformers but effectively 
switching 220V in/110V out AC power supplies that instead of nice clean sine 
waves can generate some very nasty spiked waveforms that are OK for steam 
irons, hair curlers etc. but can damage electronic equipment. Then again, 
maybe the regulator just failed by coincidence.

m

----- Original Message ----- 
From: "Didier Derny" <didier@aida.org>
To: <cbm-hackers@musoftware.de>
Sent: Wednesday, February 01, 2012 5:55 PM
Subject: RE: 110V 60Hz / 220V 50Hz power supply


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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