[Diy_efi] 555 timer for injector driver

Fri Jul 8 00:34:46 UTC 2005

Thanks everyone!

The Mosfet worked, I picked up a darlington as well, but the mosfet was PnP 
(IR510?) (along w/ a diode).

Thanks again!

Zoom Zoom-
JEFF

All out DIY:
1996 Miata - T25
2003 Protege - T3

<br><br><br>From: don.broadus at exeloncorp.com<br>Reply-To: 
diy_efi at diy-efi.org<br>To: diy_efi at diy-efi.org<br>Subject: RE: [Diy_efi] 555 
timer for injector driver<br>Date: Thu, 7 Jul 2005 12:56:40 -0500 
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diy_efi-bounces at diy-efi.org<br>X-OriginalArrivalTime: 07 Jul 2005 
17:58:45.0618 (UTC) FILETIME=[84DB4520:01C5831D]<br><br>Hi Dan: I did notice 
the missing clamp diode, I had planned on adding one<br>myself.<br>         
The circuit will come in handy for pulsing injectors on the car and<br>also 
for<br>         a flow bench I'm working on. Thanks again for sharing a 
great<br>circuit.<br><br><br><br><br>-----Original Message-----<br>From: 
diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On<br>Behalf 
Of Daniel R. Nicoson<br>Sent: Thursday, July 07, 2005 12:01 PM<br>To: 
diy_efi at diy-efi.org<br>Subject: RE: [Diy_efi] 555 timer for injector 
driver<br><br><br>Don,<br><br>check with me tomorrow.  I want to check my 
breadboard to see if I an using<br>a diode across that TIP-120 on the 
breadboard.  I've got so many projects<br>going I just threw that out to 
help Jeff get going.  I probably need to do a<br>final quality 
check...<br><br>Dan Nicoson<br><br><br> > -----Original Message-----<br> 
> From: diy_efi-bounces at diy-efi.org 
[mailto:diy_efi-bounces at diy-efi.org]On<br> > Behalf Of 
don.broadus at exeloncorp.com<br> > Sent: Thursday, July 07, 2005 12:31 
PM<br> > To: diy_efi at diy-efi.org<br> > Subject: RE: [Diy_efi] 555 
timer for injector driver<br> ><br> ><br> > The Signal Generator  
circuit is great !  Plan to wire one up. Thanks Dan<br> > for sending it 
out.<br> > Take Care  Don<br> ><br> ><br> ><br> ><br> 
><br> ><br> ><br> ><br> > -----Original Message-----<br> > 
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On<br> 
> Behalf Of Daniel R. Nicoson<br> > Sent: Thursday, July 07, 2005 
10:03 AM<br> > To: diy_efi at diy-efi.org<br> > Subject: RE: [Diy_efi] 
555 timer for injector driver<br> ><br> ><br> > Jeff,<br> ><br> 
> I'd skip the solenoid to run your injector.  You're trying to<br> > 
control a slow<br> > device (injector) with possibly an even slower 
device (solenoid).<br> ><br> > Use either a Darlington transistor or a 
Mosfet as has already been<br> > suggested.  They are not too expensive 
from the local Radio<br> > Shack.  I use a<br> > good heat sink on the 
TIP-120 shown in the diagram.  When running at long<br> > pulse widths, 
it can build some heat.  (TIP-120 was used simply because it<br> > was in 
my parts bin, other Darlington's will work.  You would want to add<br> > 
few other things to use the Mosfet properly)<br> ><br> > I've attached 
a .pdf of the signal generator I've developed for<br> > use with my<br> 
> projects.  Use as much or as little of this circuit as you wish.  I'm 
only<br> > using a breadboard version at this point. I may make up a PCB 
later this<br> > month.<br> ><br> > Take care,<br> ><br> > 
Dan Nicoson<br> ><br> ><br> > > -----Original Message-----<br> 
> > From: diy_efi-bounces at diy-efi.org 
[mailto:diy_efi-bounces at diy-efi.org]On<br> > > Behalf Of jeff 
matthews<br> > > Sent: Wednesday, July 06, 2005 9:39 PM<br> > > 
To: diy_efi at diy-efi.org<br> > > Subject: [Diy_efi] 555 timer for 
injector driver<br> > ><br> > ><br> > > Hi-<br> > > 
To keep my ??? simple,  I built a 555 timer to work on a little<br> > 
> experiment,<br> > > I have it energizing the solenoid on a  12v 
relay, why won't it open and<br> > > close my injector? (it's just a 
basic saturated 550cc).  Is there some<br> > > secret to on making an 
injector operate?<br> > ><br> > > Like I stated,  this is for an 
experiment, just thought I could handle<br> > > making an injector 
fire on the bench...<br> > ><br> > > Best regards,<br> > > 
JEFF<br> > ><br> > ><br> > > 
_______________________________________________<br> > > Diy_efi 
mailing list<br> > > Diy_efi at diy-efi.org<br> > > 
http://lists.diy-efi.org/mailman/listinfo/diy_efi<br> > ><br> ><br> 
><br> > 
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