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'[EE]: 2-tran boost circuit; 5v -> 13v'
2002\10\02@180019 by Bill Westfield

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There's this interesting circuit for driving white LEDs from 1.5V here:
www.emanator.demon.co.uk/bigclive/joule.htm
I've prototyped the circuit with various transformers, and it works
quite nicely, generating pulse better than 20V with "dead" batteries
as supply.  It claims to work down to .35V input (I don't see how this
is possible, given Vbe, but...)  A diode and cap give you DC output,
and it LOOKS to me like a feedback circuit ought to be able to shut
down the switching transistor to provide some level of regulation.

BillW

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'[EE]: 2-tran boost circuit; 5v -> 13v'
2002\12\09@131538 by Spehro Pefhany
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At 02:57 PM 10/2/02 -0700, you wrote:
>There's this interesting circuit for driving white LEDs from 1.5V here:
>www.emanator.demon.co.uk/bigclive/joule.htm
>I've prototyped the circuit with various transformers, and it works
>quite nicely, generating pulse better than 20V with "dead" batteries
>as supply.  It claims to work down to .35V input (I don't see how this
>is possible, given Vbe, but...)

No problem, just don't expect it to *start* at 350mV..

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam@spam@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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