Re: c64 / vic 20 power supply replacement

From: Gerrit Heitsch <>
Date: Fri, 28 Oct 2016 21:39:42 +0200
Message-ID: <>
On 10/28/2016 09:11 PM, Francesco Messineo wrote:
> On Fri, Oct 28, 2016 at 8:47 PM, Gerrit Heitsch
> <> wrote:
>> I found it easier to just open up the PSU, remove the rectifier, capacitor
>> and 78S05 regulator. Then add a better rectifier, capacitor and a switching
>> regulator. The latter you can get on a small PCB on ebay cheaply. I like the
>> boards based on the MP1584.
>> From the outside the result looks the same, the PSU no longer runs hot, you
>> get the real 9V AC and, on the +5V, you get more than the 1.5A the old PSU
>> gave you.
> this would be great if only the European PSUs weren't filled with
> epoxy, making them
> virtually unfixables :(

Depends on the PSU... The early ones (*) have only the transformer part 
filled with resin. The part that contains the capacitor and rectifier is 
hollow. The only problem is to get the bottom off, but that's easy once 
you figure out how it's done. Once the bottom is off, you have access to 
everything you need to replace the regulator.

The later, brick shaped, ones are fully filled with resin, rendering 
them unfixable.

(*) I mean this shape:


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