Alt-BEAM Archive

Message #05345



To: beam@corp.sgi.com
From: television_is@mindless.com
Date: Thu, 22 Jul 1999 08:48:44 +1000
Subject: [alt-beam] Re:solar cell v doubler



--------------392663D97647998397BE2E3B
content-transfer-encoding: 7bit
content-type: text/plain; charset=us-ascii


Wilf Rigter wrote
"This voltage doubler circuit is often designed around a 555. "
I found this circuit on the Zetex site about their 'new and efficient'
zsct1555 which they say continues to supply 5 volts from down 0.9 volts
in their voltage booster circuit. (attached)
The page is at http://www.zetex.com/applic1.htm
How can a circuit with so many bits be anywhere near as efficient as
your charge pump Wilf?
Is this 'new' 555 actually better than the cmos version?

Rob


------------------------------------------------------------------------

eGroups.com home: http://www.egroups.com/group/alt-beam
http://www.egroups.com - Simplifying group communications




--------------392663D97647998397BE2E3B

Attachment: cell.gif

--------------392663D97647998397BE2E3B--



5346 Wed, 21 Jul 1999 19:27:54 -0400 [alt-beam] Re: balancing acts (was: something else) beam@sgiblab.sgi.com Richard Weait At 10:54 AM 7/21/99 -0600, 'Zoz' wrote:
[snip]
>A similar question: an old problem in control theory is the "balancing
>rod". In its most simple form, you've got a cart that can only move (back
>or forth) along a line. Attached by a hinge is a rod that you want to keep
>pointing upwards. If no control is applied, the rod will fall. The
>problem is to move the cart forwards or backwards to keep the rod upright.
[snip]
>
>Zoz
>
>p.s. more complicated problems include a rod-on-top-of-a-rod and a rod that
>is gimbaled by a ball-and-socket joint so that it could fall in a
>two-dimensional manner.

OH Zoz! Like the rod in one dimension or two isn't difficult enough!
A jointed rod!?!?!? Ouch! But jointed in how many dimensions? And
if one joint; in the same axis, or orthogonal?

Which is more complex? Two distinct joints orthogonal or two co-planar?
Two joints orthogonal, or two co-located?

I will not be able to sleep. Perhaps I'll have to try this by hand to
get a feel for the problem.

I think this 'balancing act' in any flavour is a good subject for a BEAM
competition. Waddayathink? BEAM-2K in my basement with NV-launched jo's?

Thanks, 'Zoz.'


Richard.


------------------------------------------------------------------------

eGroups.com home: http://www.egroups.com/group/alt-beam
http://www.egroups.com - Simplifying group communications



Home