The transistor is part of the LM2907 chip and an NPN would be correct in
this sink configuration. It would use a PNP if it was going to source
voltage to the relay.
Thanks
Duncan
-----Original Message-----
From: spridgets-bounces@autox.team.net
[mailto:spridgets-bounces@autox.team.net] On Behalf Of WFO Herb
Sent: Thursday, September 24, 2009 3:48 PM
To: Dean Hedin
Cc: spridgets@autox.team.net
Subject: Re: [Spridgets] Fuel pump
I think the NPN should be a PNP.Herb
On Wed, Sep 23, 2009 at 8:16 PM, Dean Hedin <dlh2001@comcast.net> wrote:
> While we are on the topic of electric fuel pumps....
>
> I chisled out this circuit from National Semiconductor's application note
> 162.
>
>
>
http://i295.photobucket.com/albums/mm135/brokencase_photos/circuits/pumpsafe
.jpg
>
> It will only power on the fuel pump if the engine is turning over.
> I ordered the parts and should attempt to build the cicuit this weekend.
>
> I'll let you know how it goes. If I make any alterations I will post an
> update.
>
> Use at your own risk.
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