08/21/08: MC-10 Power Supply Specs by JP, | Category: CoCo Clones | 4 comments - (Comments are closed)

MC-10 Power Supply Specs

I’ve acquired an MC-10, but no power supply was included. The manual says it needs 8V and 1.5A for power. Does anyone know the specification for the power plug that inserts into the computer itself? (e.g. plug inside/outside width, positive/negative to tip.) I think I can find an adapter that will work, but need these additional pieces of information to be sure.

– JP

4 comments to MC-10 Power Supply Specs

  • dentman42

    Not sure about the size, but since the power supply goes through a 7805, you should be able to use a 9V DC adapter without a problem. IIRC, 78xx regulators will allow for max input of 18 or 24v, but the more input voltage, the hotter it will run. I haven’t gotten around to testing one of my MC-10s with other supplies yet. But 9v adapters should be more plentiful than 8v – at the local thrift store they usually have a big bin of AC adaptors for 90 cents each. 12v 1.5 or 1A switching supplies from scanners are common, 9v with more than 1A are not quite so common but they show up often enough. I’ve also started buying adapters at that price just for the plugs – you can always use the plug on another supply…

    Worst case, you could also open the case and hardwire the supply or change out the jack.

  • jdiffend

    Radio Shack carries a 9v adapter with a selectable plug that you can change the polarity of the tip (+-). I have one and it works with my VZ200, Oric 1, Oric Atmos, Spectrum +2, etc…
    I just have to be careful of which uses what polarity on the connector.

  • JP

    Not sure about the size, but since the power supply goes through a 7805, you should be able to use a 9V DC adapter without a problem.

    Does it indicate on your MC-10 power supply whether the positive terminal is the inside or outside of the plug? I’d hate to plug something in and get it backwards. (I think the usual convention is positive on the inside, negative on the outside of the plug.)

    [i:7b537bb72d]Follow-up: Opening up the case and following some of the traces, I’m gonna take a guess that it is positive to tip for the plug.[/i:7b537bb72d]

    – JP[/i]

  • JP

    To wrap things up…

    I purchased a cheap 8V 2A power supply. The connector is positive-to-tip, 2.5mm inside diameter, 5.5mm outside diameter.

    Seems to work, although there is massive interference on both channels 3 and 4. Dunno if that is just bad luck with this particular MC-10 or if the power supply is noisy.

    – JP