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Thread: VIC-20 | Powering Two Pin Model in Australia

  1. #1
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    Mar 2020
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    Melbourne, Australia
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    Question VIC-20 | Powering Two Pin Model in Australia

    Hi everyone!
    A whopping 10 years ago, another forum member named Kerosene had a similar problem but since the Thread (http://www.vcfed.org/forum/showthrea...l-in-Australia) is so old, I am opening a new one.

    I have recently purchased a two pin US model VIC-20 in Australia. The VIC-20 of course didnít come with a PSU so I need to organise a new one so that I actually test and use this thing!

    In the other Thread I believe the problem was solved with a step-down transformer, however since the comments are so old, I am unable to see the images that were posted.

    Would anyone be able to help? I am completely illiterate when it comes down to electronics, so any assistance would be highly appreciated.

    Thank you guys!

  2. #2

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    Yes, you would need a step-down transformer.

    Are you going to be attending the Amiga User Group of Victoria meeting on Sunday, March 15? Not only do they have Amiga computers there but they also have Commodore 8-bitters. https://www.amiga.net.au/ If you are going to that meeting, I'll see you there!

    Writing from Sydney, Australia, at the moment,
    Robert Bernardo
    Fresno Commodore User Group - http://www.dickestel.com/fcug.htm
    Southern California Commodore & Amiga Network - http://www.portcommodore.com/sccan
    April 25-26 Commodore Los Angeles Super Show - http://www.portcommodore.com/class

  3. #3
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    Default

    There were 2 pin adapters that allowed a simple 9v DC supply, but they seem to have stopped making them.

  4. #4
    Join Date
    Mar 2020
    Location
    Melbourne, Australia
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    Default

    Quote Originally Posted by RobertB View Post
    Yes, you would need a step-down transformer.

    Are you going to be attending the Amiga User Group of Victoria meeting on Sunday, March 15? Not only do they have Amiga computers there but they also have Commodore 8-bitters. https://www.amiga.net.au/ If you are going to that meeting, I'll see you there!

    Writing from Sydney, Australia, at the moment,
    Robert Bernardo
    Fresno Commodore User Group - http://www.dickestel.com/fcug.htm
    Southern California Commodore & Amiga Network - http://www.portcommodore.com/sccan
    April 25-26 Commodore Los Angeles Super Show - http://www.portcommodore.com/class
    Hi Robert,
    Funny you mention it, I just joined the MAUG Group on Facebook and posted the same question there.

    I am definitely planning to attend a meeting sooner or later, but this weekend is Formula 1 time!!!

    Thank you for your feedback regarding the step-down transformer. Would you have any link to a suitable part? I need to get my head around what I need exactly...

  5. #5

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    What I did once was soldering the outputs of a 9V-3A transformer directly to the pins on the motherboard. Worked fine. Later I found an original trafo, desoldered the cable, problem solved.
    The advantage of the above solution is that you can use an Australian trafo, no step-down trafo needed. And if you can find a plug that fits in the original connector, you can even skip the soldering.
    Success!
    With kind regards / met vriendelijke groet, Ruud Baltissen

    www.baltissen.org

  6. #6
    Join Date
    Mar 2020
    Location
    Melbourne, Australia
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    Default

    Quote Originally Posted by Ruud View Post
    What I did once was soldering the outputs of a 9V-3A transformer directly to the pins on the motherboard. Worked fine. Later I found an original trafo, desoldered the cable, problem solved.
    The advantage of the above solution is that you can use an Australian trafo, no step-down trafo needed. And if you can find a plug that fits in the original connector, you can even skip the soldering.
    Success!
    Well, that was my doubt. A few people on Facebook have suggested to use a 9V 3A power supply and then replace the connector with a female Figure 8 that fits the VIC-20. That seems pretty straight forward, and possibly easier than using a step-down transformer...

    From the height of my ignorance, how are the two solutions comparable? In other words, what is the 9V 3A power supply doing that the step-down transformer would also do?

  7. #7
    Join Date
    Mar 2020
    Location
    Melbourne, Australia
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    Default

    Ok, so the current plan of action is...

    Purchase one of these:

    https://www.jaycar.com.au/9v-dc-3a-p...plugs/p/MP3496

    One of these:

    https://www.ebay.com.au/itm/2-Pairs-...MAAOSwT9NdwlA1

    And one of these:

    https://www.officeworks.com.au/shop/...-1-2m-japl3012

    Cut the power point from the Jackson figure 8 and expose the wires. Connect the wires to the female adapter and plug it to the male attachment of the 9V 3A power supply. With lots of luck, everything should work well.

    Thoughts?

  8. #8

    Default

    You only need a step-down or a step-up trafo if you have a power supply (PS) with a different input voltage than is used in AU. For example: the Netherlands use 230V, the US 110V. So using the original PS forces me to use a step-down trafo, 230V -> 110V. In my case I simply plugged a European PS into the American NTSC VIC-20. Why? The voltage that goes into the VIC-20 is what matters. So in your case you can use an Australian trafo as long as it capable of outputting 9V and can deliver 3A at minimum. It is no problem if you have a trafo that can deliver 4 or 5A. More could be a problem because if you underpower a trafo, the outputted voltage tends to rise a bit. This means the regulator has to work a bit harder and becomes warmer.
    With kind regards / met vriendelijke groet, Ruud Baltissen

    www.baltissen.org

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