Alt-BEAM Archive
Message #13822
To: beam@sgiblab.sgi.com
From: Bruce Robinson Bruce_Robinson@telus.net
Date: Fri, 21 Apr 2000 21:15:01 -0700
Subject: Re: bicore
Hi, Simon.
I don't know of any '240 chip that will handle 300 mA.
The H-bridge shown at Beam-online can handle about 100 mA comfortably.
You can easily modify it for more current. The middle row of transistors
stays the same, but the top and bottom row have to be replaced. Use
PN2222 to replace the 2N3904 transistors, and PN2907 to replace the
2N3906 transistors. This should let you handle up to 800 mA.
The replacements are the same size and have the same pinout, so they can
be directly substituted.
Bruce
13823 Sat, 22 Apr 2000 00:36:27 -0400 (EDT) re: silence bot "'beam@sgiblab.sgi.com'" Jeffrey D Spears I heard once the coatings on stealth aircraft are designed to achieve this
mechanically. Incomming radar waves are reflected 180degrees out of phase,
thus both the incident *and* reflected waves are cancelled. He further went
on to say how such technology could be applied to automotive exhaust
systems.
Cool eh?
ok..jef
> special DSP is used which shifts every frequency by 180 degrees. This drives
> a "speaker" at a junction in the exhaust pipe precisely canceling the
> exhaust noise. Altenatively a muffler can be "tuned" for that signature
> sound.
Jeffrey D. Spears
University of Michigan
College of Engineering
``Double-E, can't spell gEEk without it!''
-Captain Gerald M. Bloomfield II, USMC
(my brother)
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