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Need Help Making A DC 12 V Adaptor

Discussion in 'General Electronics' started by Robo Ronald, May 1, 2004.

  1. Robo Ronald

    Robo Ronald Guest

    Hello,

    I have a Sony PS-LX295 turntable, and it is supposed to be powered by
    a Sony TA-AX295 receiver, I believe. I know it is DC 12 V, and I want
    to make an adaptor, but I don't know the amperage. I looked in the
    inside, and it says on the motor, "Matsushita MMI-6T2RW0 28 Oct 89
    TE". I am not sure if the "0" after the "W" is indeed a zero or an
    "o". Thanks in advance.

    Regards,
    Robo Ronald
     
  2. Some Guy

    Some Guy Guest

    Seems to me that if that W indicates a wattage rating follows, then W0 would
    mean less than a watt... might even be less than a tenth of a watt.
    Thing is, you don't have to worry about giving it too much current if all
    you are going to do is hook a complete device up to an alternate power
    source... It won't draw more than it normally does because current is
    voltage divided by resistance, and the voltage and resistance have not
    changed... This means you could hook it up to a 12V battery such as a car
    battery, and measure the current it draws. Then build your adapter to
    provide at least that much current.

    One caution: be very sure that it is supposed to receive 12Vdc from the
    other device before you start putting dc voltage in. If that other device
    is actually sending it, say, 12Vac which is then getting rectified inside
    the unit, and you put 12Vdc in, you could cause problems.... burn out a
    transformer or a diode, for instance.

    Just my two hundredths of a dollar.
     
  3. Matt98B5

    Matt98B5

    1
    0
    Jun 10, 2010
    Alright, I'm bringing this thread back from the dead! I found it after looking for a way to power my new record player, and I thought I'd share what I came up with to help anyone else out that tries this.

    I recently got a Sony PS LX295 turntable, and I too was missing a power supply. The old Sony HST 221 stereo I have does not have the correct plug to attach this record player directly to it for power. I rigged an AC to DC adapter that is rated to output 12v at a maximum of 100 mA to it, and it works great. I measured the output voltage of the adapter when the player is off, and in use, and it starts at about 14-15v, then drops to about 13v. I also tried to measure the DC amps that the record player was drawing, but it didn't even register on the multimeter. I played a record on it to test it (Journey, in case you were wondering), and it worked great.

    Now I have to clean up my work, and make a more permanent connection to the power supply, but I'm glad that I now have a working turntable.
     
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