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 : firstname.lastname@example.org [mailto:email@example.com] De la part de Rainer Buchty Envoyé : mercredi 1 février 2012 23:19 À : firstname.lastname@example.org 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 Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2012-02-01 23:00:23
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