Re: IIc+ Power Supply mod.

["Luke Forat" <iceman@nospam.digidude.homeip.net>]

   Jorge,

   your speculations are correct. Modding from 220V input to 110V is 
possible with a wave doubler configuration (as you have noted, most non 
"autoregulating" PSUs have that switch which does exactly this) but the 
contrary is a major problem and yes you risk a cap explosion and a junction 
breakdown - some nasty fireworks and smoke. The best and quickest thing you 
can do is get a 220 to 110V autotransformer with at least a 1 Amp rating on 
the input - or - replace the PSU with a 220V one.

   Regards,

            Luke
-- 
"Jorge Chamorro Bieling" <bieling@terra.es> ha scritto nel messaggio 
1ha9anv.1anq4tc183e9sN%bieling@terra.es">news:1ha9anv.1anq4tc183e9sN%bieling@terra.es...
>I want to convert the IIc+ power supply to 220v.
> The input has a full wave rectifier that feeds a single 200v 100microF
> electrolitic capacitor.
>
> Do you think that replacing the full wave rectifier for a half wave
> rectifier will do it ?
>
> I would like to think that yes, but I really don't think so.
>
> In fact I think that the only difference that this will make is that the
> capacitor will take twice as much cycles to charge, but the voltage
> across it will end up being the same as with the full wave rectifier and
> the whole thing will explode or whatever...
>
> In some switchers there are two capacitors, and the rectifier can be set
> with a jumper to full wave bridge (220v) or full wave doubler (120v).
> This power supply is not of this kind...
>
> The main problem I see here is that the voltage I need across this
> capacitor is half what I get from the mains plug. (well, that is quite
> obvious)
>
> Any (clever) ideas please ?
> -- 
> Jorge Chamorro Bieling