Re: [CAD_CAM_EDM_DRO] Electrical Help

At 09:47 04/08/00 -0500, you wrote:

>Let me preface this by saying I don't know of any op amps that work over 40
>VDC.

You don't need one. Use a voltage divider network to bring the voltage
range down to something reasonable before plugging it into the comparator.

>The normal way to do what you want to do is with a special op-amp circuit
>called a comparator. You compare the actual voltage to a "reference
>voltage" and te op-amp amplifies the difference. An analog filter would
>give you the +/- 3V dead zone, and an H-bridge would allow you to turn the
>motor.
>
>On second thought, This would be a great project for a 2$ PIC
>microcontroller and an A/D Converter. Less Chips + Less Cost = More Cool!

Possibly more cool - not clear that it is easier/less cost in this case
though. A voltage comparator solution as suggested by Mariss is pretty
simple & cheap, and doesn't require you to learn programming in esoteric
assembler code dialects.

Regards,
Tony