[Diy_efi] 555 timer for injector driver

[don.broadus at exeloncorp.com]

The Signal Generator  circuit is great !  Plan to wire one up. Thanks Dan
for sending it out.
Take Care  Don  








-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Daniel R. Nicoson
Sent: Thursday, July 07, 2005 10:03 AM
To: diy_efi at diy-efi.org
Subject: RE: [Diy_efi] 555 timer for injector driver


Jeff,

I'd skip the solenoid to run your injector.  You're trying to control a slow
device (injector) with possibly an even slower device (solenoid).

Use either a Darlington transistor or a Mosfet as has already been
suggested.  They are not too expensive from the local Radio Shack.  I use a
good heat sink on the TIP-120 shown in the diagram.  When running at long
pulse widths, it can build some heat.  (TIP-120 was used simply because it
was in my parts bin, other Darlington's will work.  You would want to add
few other things to use the Mosfet properly)

I've attached a .pdf of the signal generator I've developed for use with my
projects.  Use as much or as little of this circuit as you wish.  I'm only
using a breadboard version at this point. I may make up a PCB later this
month.

Take care,

Dan Nicoson


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of jeff matthews
> Sent: Wednesday, July 06, 2005 9:39 PM
> To: diy_efi at diy-efi.org
> 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
>
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/diy_efi
>


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