OT - any old controls geeks know the RCA HC2500?

[sauer38h]

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?

[i2tgrad]

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

[J Tiers]

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).]

[pockets]

You might try: www.thegeekgroup.org

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

Regards, Greg B.

[sauer38h]

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.

[J Tiers]

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

Should at least have specs, maybe more.

I'll look around.