On 5/30/07, Gus Wirth <[EMAIL PROTECTED]> wrote:
Christoph Maier wrote:
[snip]
> Newer LEDs are surprisingly bright at low currents.
> The forward voltage, however, is a hard limit.
>
> By sheer coincidence, I used a circuit to get enough voltage for a green
> LED from only 700mV as proof-of-concept for wine:
>
http://www.kernel-panic.org/Members/cmaier/hamburger-lugnut-log/archive/2007/02/04/both-linuxes-emulate-windows-xp/
> (by the way, Plone still doesn't work quite right, *&[EMAIL PROTECTED])
> but you'd need an AC waveform for the charge pumps to work.
> It's not easy at all to build a DC to AC converter that works from
> 700mV.
Ah, a classic voltage multiplier. I see you are using Schottky diodes
for the low Vf. But the problem for Lan is going to be the pulse
generator. That will be a more interesting circuit. Or maybe we need to
go way back in time and use a mechanical chopper circuit :)
Gus
Rotating synchronous mechanical chopper to stack
voltage on caps. Charge at low voltage in parallel
then stack them all in series. Would be kind of fun :)
Like a mechanical variation on the good old Cockcroft Walton
http://en.wikipedia.org/wiki/Cockcroft-Walton_generator
Back in the 60's I designed and built 5 kilovolt power supplies
for Geiger counters and photomultipliers that we flew on spacecraft
... confessions of misspent youth.
BobLQ
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