Re: ATM Re: stepper circuit

[behambu@ibm.net (Berthold Hamburger)]

On Sat, 19 Oct 1996 23:53:45 +1000 (est), you wrote:

>From memory I think that Stephen's circuit is based on the one by
>Ray Grover, and uses the SAA1027 stepper controller chip.  I found
>that increasing the value of the bias resistor connected to pin 4
>was sufficient to stop my stepper getting too hot (it was taken
>out of an old floppy drive, and is not labeled with a voltage
>rating).  I ended up using about 1400 ohms instead of the original
>220 after a bit of experimentation.

That sounds interesting. Do you remember the voltage rating of that
motor?

BTW. Does anyone have the electrical specifications of the SAA1027 on
hand? I would need the number of in and output pins and the signal
pins.

Berthold

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