Alt-BEAM Archive
Message #00731
To: beam@corp.sgi.com
From: Steven Bolt sbolt@xs4all.nl
Date: Sun, 21 Feb 1999 20:14:00 +0100 (CET)
Subject: [alt-beam] Re: stepper motors
On Sun, 21 Feb 1999, Wilf Rigter wrote:
> I would say Richard wastes about 0.8 ma since the 1K is across the
> base-emitter
> junction. However the TO3 MJ2955 is a monster, bigger than the MicroCore,
> has an max Ic of 15A and an hFE of about 30. A complete mismatch for the
> MicroCore drive capability. You want amps? You need a power mosfet !
I didn't look up the transistor :)
What kind of stepper is that, for ###'s sake? Part of that hobby
horse walker mentioned a few days ago? But even this 2N3055
look-alike wouldn't need a 1K pull-up on its base...
And I don't like wasting 800uA. My `Son of Photovore' runs full
speed on 80uA.
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# sbolt@xs4all.nl # Steven Bolt # popular science monthly KIJK #
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