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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Piezo Ignitor to power an LED -- any ideas?
Date: Thu, 21 Nov 2002 14:42:43 GMT
NNTP-Posting-Date: Thu, 21 Nov 2002 06:42:43 PST
Kevin McMurtrie wrote:
> In article <email@example.com>,
> J81 wrote:
> >I've got this half-baked idea to use a piezo ignitor to power an LED
> >which needs 2.5v at around 15ma to 20ma. I'm currently under the
> >impression that my piezo ignitor and piezo ignitors in general put out
> >micro-amperes of power, at around ten thousand volts or more. I'm
> >wondering if it's possible to step down the voltage to 2.5v to briefly
> >power my LED, or possibly charge a capacitor which will power the LED
> >over a short period of time. If it is possible, how would I go about
> >doing it?
> >I believe a running shoe was manufactured at some point that had
> >little flashing LEDs which were powered by a piezo ignition like I'm
> >speaking of, but I can't for the life of me remember who made them.
> >Thanks in advance for any help.
> A piezo ignitor will not power an LED or anything else. The total power
> released from the hammer's strike is too low.
> It's hard to find data on the blinking shoes. I suspect they use a
> lithium battery but it could be generated.
It is possible that they used piezoelectric kynar plastic material which
can be fabricated with large enough area to be useful. Thin sheets can
produce a low voltage on the relatively high capacitance of the sheet.
However, a human is usually about a 15psi load on a surface. That's even
a bit low for the kynar material.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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