At 05:21 PM 11/21/02 -0500, you wrote:
>Once again, I'm not looking for anyone to do my work for me - just hoping
>someone can give me a little push down the hill.

Right there behind you. ;-)

>I'm after the lowest cost way to make the 90V needed for a brush motor PWM
>speed control w/ current limit.....Any ideas as to where I might start
>looking?

 From 120VAC? FW bridge with appropriate fusing and surge suppression and
EMI filtering, followed by a BFC filter. Limit the duty cycle of your PWM
to less than about 55 or 60%. Optically isolate the PIC (presumably, eh?)
controller and power it from a separate transformer power supply if possible.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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