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LP12 Basik power supply

Discussion in 'd.i.y.' started by JMP, Apr 22, 2008.

  1. JMP

    JMP Member

    I'm looking for the diagram of the Linn Basik power supply.

    Somebody here shall have this?

    Thank you very much
  2. Dowser

    Dowser Learning to bodge again..

    Three caps and a resistor I believe - check my thread in Classic on renovating a 30 year old LP12 for piccies.

  3. JMP

    JMP Member


    Saw the pics, thanks. Seems very simple!

    Is it possible to have the values of the components and a diagram (back engineered from the PCB)?

    Thank you
  4. stevec67

    stevec67 pfm Member

    It *is* very simple. The Armageddon is equally simple, once the transformer is taken into account. You only need a capacitor to supply the field coils with mains 90 deg out of phase and the motor will run. The resistor just limits the current, and you're in. Oh, the joys of synchronous motors.:)
  5. martin clark

    martin clark pinko bodger

    The resistor doesn't actually limit the current - the high inductance and resistance of the motor does that (c. 4.7- 5H and around 10Kohm total impedance at 50Hz). These motor values dominate in calculating suitable R, C values.

    So the resistor just drops the voltage appearing across the motor. Bigger resistor = lower voltage = less vibration, limited only by needing enough volts to make the turntable actually start-up.

    For values, try R=4700ohms to 6800ohms, C=0.2uF. You'll see C=0.22 in many circuits, but two 0.1uF caps in parallel gives a more accurate 90degree phaseshift for the Linn motor on 50Hz mains.

    As Steve says, the Armageddon only adds an isolation transformer to the basik(sic) idea.

    Don't overlook RichardH's excellent article in the Reference room:
  6. JMP

    JMP Member

    Thank you!
  7. Darran.H

    Darran.H pfm Member

    I have a couple of the basik power supplies if you are looking for one p.m. me.
  8. 337alant

    337alant Negatively Biased

    You can also get the 1973 wiring diag from the vinyl engine site
    I was going to build one based on that diag so I can try out my old flutter buster.
    Martin your suggestion seems much simpler could you post a diag with suggested best componants to use
  9. stevec67

    stevec67 pfm Member

    There's something in the reference section on DIY Geddon, and a load of useful stuff on Neil, erm, whatsizname's site.
  10. flatpopely

    flatpopely Prog Rock/Moderator

  11. neiljadman

    neiljadman Senior Member

    Kind of on & off the subject - does anyone have a spare used but serviceable 60hHz motor available?

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