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

From: Gerrit Heitsch <>
Date: Sat, 07 Apr 2012 18:04:59 +0200
Message-ID: <>
> 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 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.


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Received on 2012-04-07 17:00:10

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