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Thread: OT - any old controls geeks know the RCA HC2500?

  1. #1

    Post OT - any old controls geeks know the RCA HC2500?

    This is a hybrid op-amp which was popular for driving FHP DC servomotors back when Analog was King. It's a relatively high-power device - something around 20V and 6 amps, maybe - but I'm still afraid that I'll fry something if I try to figure out by guess and by gosh just how those ten pins connect. Anyone have a line on a data sheet?

  2. #2
    Join Date
    May 2005
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    4

    Post

    You can get the data on
    CDROM from

    http://www.ecadata.de/searchnew/

    I don't know what the cost will be, you can open an account and find out - regards, Peter

  3. #3
    Join Date
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    Independent principality of Sinquefieldia (formerly Missouri)
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    Post

    Try 75V and 7 amps.... max ratings, subject to safe operating area of output devices......

    0.5% thd 30 kHz bandwidth.......

    1 -V (-V power) (called drive1)
    2 -V (-V input circuitry)
    3 output
    4 +bias adjust
    5 frequewncy comp
    6 - input
    7 +input
    8 - bias adjust
    9 drive2 upper output emitter
    10 +V

    There was a related device, the HC2000H, which has a different pinout, and includes various protection facilities.

    You got some of these critters?

    I have teh data sheet for the two in a catalog..... and access to a copy machine.....should you be interested.

    There aren't any apps circuits with it, but I MAY be able to scare that up from another source.......


    [This message has been edited by J Tiers (edited 10-12-2005).]
    1601 2045 1412 2321

    Keep eye on ball.
    Hashim Khan

  4. #4

    Post

    You might try: www.thegeekgroup.org

    No, these are NOT the idiots you see on TV!

    Regards, Greg B.
    If you\'re data is anomalous, you\'ve more digging to do.

  5. #5

    Post

    Excellent, thanks, those pin assignments are the ones I was looking for.

    I have a couple of these amps on small circuit boards. I have traced out most of the circuitry, and they're conventional difference amplifiers, although I haven't yet puzzled out some peculiarities in the velocity feedback circuit. These boards drove an x-y positioning table in a machine which printed the circuit patterns on silicon wafers, which would later be sawed up and packaged as processors and large memory chips - all very high-tech, or rather the high tech of twenty years ago.

    The motors are Electro-Craft 576 permanent magnet DC servomotor-tach combinations. I've lost the data sheets for those, too.

  6. #6
    Join Date
    Jan 2004
    Location
    Independent principality of Sinquefieldia (formerly Missouri)
    Posts
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    Post

    SOMEwhere, I have an Electro-Craft book or two.

    Should at least have specs, maybe more.

    I'll look around.
    1601 2045 1412 2321

    Keep eye on ball.
    Hashim Khan

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