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'[OT]: One transistor LED flasher?'
2000\09\13@131140 by staff

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> At 08:12 AM 9/13/00 -0700, you wrote:
> >I am looking for a one transistor LED flasher circuit. I am aware of the
> >self flashing LEDs thank you. Anyone have a schematic?


Hard to build a one transistor oscillator. Most are RF type
osc at high frequency. To get anything like a led flash
frequency you will need a massive inductor, we are talking
power transformer size here! Are you sure you want to do this?

Try two transistors in the classic flip-flop, or my favorite;
the 555 timer that can be handy for so many things.

:o)

PS. I am really curious why it has to be a one-transistor
led flasher, is it a bet or something??

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2000\09\13@132005 by Andrew Kunz

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Sounds like a perfect application for a 12C508.

Andy

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2000\09\13@135610 by Bob Ammerman

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Now wait a minute Andy....

why didn't you change the subject line to [PIC]:  :-)

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)


----- Original Message -----
From: Andrew Kunz <akunzspamKILLspamTDIPOWER.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Wednesday, September 13, 2000 1:19 PM
Subject: Re: [OT]: One transistor LED flasher?


> Sounds like a perfect application for a 12C508.
>
> Andy
>
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2000\09\13@153359 by rottosen

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Been there, done that. Soldered the PIC pins right to the battery holder
terminals, LED and resistor.  I call it a precision LED flasher :-))

Andrew Kunz wrote:
>
> Sounds like a perfect application for a 12C508.
>
> Andy
>
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2000\09\13@161716 by Lance Allen

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On 13 Sep 2000, at 13:31, Richard Ottosen wrote:

> Been there, done that. Soldered the PIC pins right to the battery holder
> terminals, LED and resistor.  I call it a precision LED flasher :-))
>
> Andrew Kunz wrote:
> >
> > Sounds like a perfect application for a 12C508.
> >
And I thought my 12C508 as a 3v monostable was a basic app!
_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

http://www.psych.auckland.ac.nz

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2000\09\13@180445 by Ricardo Seixas

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Did you used a crystal or internal RC ?
If it's a RC then it's not so 'precise',
maybe you can use that WDT/temperature trick to
increase/reduce the flashes... <G>
Sorry, couldn't resist...

>Been there, done that. Soldered the PIC pins right to the battery holder
>terminals, LED and resistor.  I call it a precision LED flasher :-))
>
>Andrew Kunz wrote:
> >
> > Sounds like a perfect application for a 12C508.
> >
> > Andy
> >

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2000\09\14@042325 by mike

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On Wed, 13 Sep 2000 13:19:06 -0400, you wrote:

>Sounds like a perfect application for a 12C508.
>
>Andy
Holtek make a LED flasher in a TO92 package

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2000\09\14@054836 by Alan B. Pearce

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>You didn't specify what kind of transistor you needed to use, so I'll
>suggest a unijunction transistor.

>Good luck finding them though, I don't know if they are still made.

A TO92 case SCR makes a nice programmable unijunction transistor.

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