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Subject: Re: LED Flasher Circuit Needed
X-Newsreader: Microsoft Outlook Express 5.00.3018.1300
NNTP-Posting-Date: Mon, 11 Nov 2002 17:22:55 CST
Organization: Prodigy Internet http://www.prodigy.com
Date: Mon, 11 Nov 2002 23:22:55 GMT
Thanks Kevin. Looks like I'll be getting the breadboard out!
"Kevin McMurtrie" wrote in message
> In article ,
> "HuMike" wrote:
> >I've got a .750 volt D.C. source capable of about 130 ma. available. Is
> >there a circuit available capable of flashing an LED or multiple LED's in
> >sequential pattern? I realize it's not much to work with but any ideas
> >appreciated. I did get my hands on a National LM2623 boost converter but
> >needs about 1.1 volt to start and a minimum of .9 after that.
> >Thanks in advance.
> At that voltage you can only use one transistor to get things going. A
> simple transistor oscillator driving a center tapped transformer may do
> it. (Power on center tap, drive one side, get feedback from other side.)
> If that's not enough current, you can use it to jump start a step-up
> regulator. I've been able to drive 12V worth of LEDs from as little as
> 0.1V before loosing current regulation. The circuit continued at
> reduced output down below 0.05V. Below that it stalled and needed a
> 4.5V jump start.
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