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From: fredm@media.mit.edu (Fred G Martin)
Subject: Re:  Acceptable Board Voltages for 6270 Boards?
Message-ID: <1995Jun10.040739.16458@media.mit.edu>
Sender: news@media.mit.edu (USENET News System)
Organization: MIT Media Laboratory
References: <D9tuq6.Kxo@hpl.hp.com>
Date: Sat, 10 Jun 1995 04:07:39 GMT
Lines: 26

In article <D9tuq6.Kxo@hpl.hp.com> tibbs@hpl.hp.com (Kevin W. Tibbs) writes:

>If recently built the 6270 board from MIT and I was wondering what are the
>acceptable voltage ranges for the microprocessor and motor voltages?
>
>Can they be different?

Yes.

>What I would like to do it put 12 volts on the motor voltage input and 6 volts
>on the microprocessor voltage input.

That's fine.

>Can I put 12 volts on the microprocessor voltage input?

No!!  Don't do it!

Take a look at the schematic:  there is only a 0.6v diode drop between
the uproc voltage input and the chips themselves.  Keep that input
voltage at 6v, or replace the 1N4001 with a 7805 voltage regulator.

	-Fred

Fred Martin | fredm@media.mit.edu | (617) 253-5108 | 20 Ames St. Rm. E15-320
Epistemology and Learning Group, MIT Media Lab     | Cambridge, MA 02139 USA
