# RE: My own PS problems..

From: Baltissen, GJPAA (Ruud) (ruud.baltissen_at_abp.nl)
Date: 2004-01-19 08:16:53

```Hallo William,

> 1) Your transformer does not deliver enough power (Watts), in which
> case the voltage will drop under load.  you may just need a bigger
> transformer.

This is what I was thinking about as well.

> 2) If your 900 expects 50 Herz current, the 60 Herz current
> may confuse the controller in the swithcing power supply.

No, the first thing a switching PS does is rectifying the incoming power.
Then the resulting DC is sent to a trafo through a transistor. This
transistor is switch on/off at a very high frequency (??? KHz) thus
generating the needed AC where a trafo can work with.
According the above you can see that it makes no difference wether the input
is 50 or 60 Hz.

> By the way, most Amarican homes have 220V available at the
> fuse box. .....
> ..... A quick cheap fix is to use the hot lines from two
> different 110V circuits that are on opposite phases.

Ehhh, that only makes 190V IMHO. But I have some PS's that work in the range
180-260V so maybe there is a chance the C900's accepts it as well.

Another possebility: Most PC PS's have a switch that enables one to choose
between 220V and 110V. To be honnest, I never studied how it worked but I
think it is done by connecting a big condensator in line with the input.
This C works as a 'resistor' thus dissipating halve of the voltage. But
being a impedance and not a real resistor, this proces doesn't generate
heat.

Please check if these PS's have this mechanism as well. Not seeing a switch
does not mean that it therfor is impossible; one could have ommitted the
switch to reduce costs as the C= was meant for Europe anyway.

--
___
/ __|__
/ /  |_/     Groetjes, Ruud
\ \__|_\
\___|       URL: Ruud.C64.org

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