[Diy_efi] 555 timer for injector driver

[Paul B]

the maximum current of the 555 is 0.5amps
just for info

regards
Paul Bidmead
Design Engineer
BidSpec

----- Original Message -----
From: "mark krawczuk" <krawczuk at dodo.com.au>
To: <diy_efi at diy-efi.org>
Sent: Thursday, July 07, 2005 9:59 AM
Subject: Re: [Diy_efi] 555 timer for injector driver


>
>
>
> HI , this is as far as i know....
>
> you have  power ( positive 12 volts) going in one side of injector, then u
> switch the earth side to make the injector open/close.
> u dont need  a relay to drive the injector,  use  the 555 timer  to
> switch/pulse a  power transistor to switch the injector, cause the relay ,
> if used to switch a injector open for  fuel use will take tooo long.
>
> i am not sure if the 555 time can switch enough current by itself ????
>
>  even though, using a relay to operate injector should work,.
>
> mark k
>
>
> ----- Original Message -----
> From: "jeff matthews" <maple69vt at hotmail.com>
> To: <diy_efi at diy-efi.org>
> Sent: Thursday, July 07, 2005 11:09 AM
> Subject: [Diy_efi] 555 timer for injector driver
>
>
> > Hi-
> > To keep my ??? simple,  I built a 555 timer to work on a little
> > experiment,  I have it energizing the solenoid on a  12v relay, why
won't
> > it open and close my injector? (it's just a basic saturated 550cc).  Is
> > there some secret to on making an injector operate?
> >
> > Like I stated,  this is for an experiment, just thought I could handle
> > making an injector fire on the bench...
> >
> > Best regards,
> > JEFF
> >
> >
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> >
> >
>
>
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