Timer Circuit needed - Electronic Circuits Projects Diagrams Free

barkster101 · 24th February 2007, 04:56 AM

Newbie Here I need to make a 2 second timer circuit for the flash from a disposable camera. now in general here is the board for the flash.

there are 2 leads for the power one AA battery
2 leads connected to an led that lites when charged about two seconds
and 2 leads that when connected trigger the flash.

I need a timer circuit that will cause the flash board to trigger after
about 2 or three seconds.

bananasiong · 24th February 2007, 08:59 AM

555 timer?

Hero999 · 24th February 2007, 11:08 AM

Which would be fine other than the fact that a 555 timer needs a minimum of 4.5V.

There is a 555 that will work from 1.5V but I can't remember the part number, perhaps someone else will.

eblc1388 · 24th February 2007, 12:46 PM

"CMOS 555" in google will give many results and among them the LMC555, GLC555 and 7555.

reyarba · 24th February 2007, 04:40 PM

Try Google or you can try the books in this site:

www.intellin.org/electronic_circuits_all.php

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24th February 2007, 04:56 AM	(permalink)
barkster101	Timer Circuit needed Newbie Here I need to make a 2 second timer circuit for the flash from a disposable camera. now in general here is the board for the flash. there are 2 leads for the power one AA battery 2 leads connected to an led that lites when charged about two seconds and 2 leads that when connected trigger the flash. I need a timer circuit that will cause the flash board to trigger after about 2 or three seconds.

24th February 2007, 08:59 AM	(permalink)
bananasiong	555 timer? __________________ Superman returns..

24th February 2007, 11:08 AM	(permalink)
Hero999	Which would be fine other than the fact that a 555 timer needs a minimum of 4.5V. There is a 555 that will work from 1.5V but I can't remember the part number, perhaps someone else will. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.

24th February 2007, 12:46 PM	(permalink)
eblc1388	"CMOS 555" in google will give many results and among them the LMC555, GLC555 and 7555. __________________ L.Chung

24th February 2007, 04:40 PM	(permalink)
reyarba	Try Google or you can try the books in this site: www.intellin.org/electronic_circuits_all.php __________________ Intellin.org Get good electronic circuits reference books.