Re: commodore plus 4 power supply... big and heavy...

On 04/07/2012 09:28 PM, Didier Derny wrote:
> Thanks for the information
>
> I'll adapt a small power supply with a plus4 connector
> And store the old one

Make sure the new supply is a regulated 5V supply. To work properly and 
not damage the Plus/4, the voltage needs to be +5V +/-5% (4.75V - 5.25V).

  Gerrit


>
>
> -----Message d'origine-----
> De : owner-cbm-hackers@musoftware.de
> [mailto:owner-cbm-hackers@musoftware.de] De la part de Gerrit Heitsch
> Envoyé : samedi 7 avril 2012 18:05
> À : cbm-hackers@musoftware.de
> Objet : Re: commodore plus 4 power supply... big and heavy...
>
>
>>
>> any idea of the use of the 9v unregulated ? (indicated on the
>> schematics) and of 9v ac (I just found 9v ac on the user port...)
>>
>> what happened if the 9v ac is not connected ?
>
> The tape recorder will not run. If you want to find out if there are any
> other effects with the setup you use, remove the large glass fuse inside the
> plus/4. That has the same effect as if 9V AC are not present.
>
>
>> any idea for a replacement of the power supply (switching power supply)...
>
> Any power supply that will give you +5V at 1.5A or better should do.
>
> Something like the power supply with the article number 350 696 at
> www.pollin.de should do the trick.
>
> Do not go above 4A or so because if you develop a short on the plus/4 board
> somewhere, the power supply will happily supply all the power needed to burn
> the circuit board instead of just shutting down.
>
>    Gerrit
>
>
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>
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