Re: c64 / vic 20 power supply replacement

From: Gerrit Heitsch <>
Date: Fri, 28 Oct 2016 21:53:31 +0200
Message-ID: <>
On 10/28/2016 09:42 PM, Francesco Messineo wrote:
> On Fri, Oct 28, 2016 at 9:39 PM, Gerrit Heitsch
> <> wrote:
>> 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.
> hm you give me a great hope. I have a few "early" ones and only one of
> the newer :)
> I have definitely to figure out how to get off the bottom!

I use a flathead screwdriver and some (gentle) force. So far I've always 

Important... Before removing the PCB, mark which lead is connected to 
GND and which is +5V. The 78S05 has GND on the middle pin.

When using a board with the MP1584 from Ebay, adjust the voltage before 
connecting to the C64. The boards I got were set to 10V.


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Received on 2016-10-28 20:02:30

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