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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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    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
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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).]
    1530 0149 0201 0215 1121 1612 0211 0207 2140 2167 2177 1605

    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
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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.
    1530 0149 0201 0215 1121 1612 0211 0207 2140 2167 2177 1605

    Keep eye on ball.
    Hashim Khan

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