[Diy_efi] current sense MOSFETs

[bcroe at juno.com]

Jim, 

The DIY-WB should work with the engine running and the 
charging system up to par.  If your wiring is losing some 
voltage, I recommend running a pair directly to the 
alternator case and output stud.  Use a fusible link for 
safety

I have a drawing of my heater circuit which I have given to 
others and could mail to your postal address.  It uses an 
inexpensive FET which has an insulated case, so it could 
be bolted to anything for a heat sink.  Its not set up directly 
for the DIY-WB, but it has a READY signal that could be tied 
in.  It could gain you 2 volts at the cost of a dozen more parts.
And of course hand wiring.  Possibly another half volt could 
be had if reworked for a current sensing FET, I'll leave that 
to someone else.

Bruce Roe

On Wed, 7 Aug 2002 19:39:52 -0400 "jim cottrill" 
<jim98 at eznet.net> writes:
> Bruce,
> Is there a chance you would be willing to share your circuit 
> so we don't have to boost the battery with a charger or such 
> other device. That is the only way I can get ok light on right now.
> TIA
> ----- Original Message -----
> From: <bcroe at juno.com>
> To: <diy_efi at diy-efi.org>
> Sent: Friday, August 02
> Subject: current sense MOSFETs

> > phil,

> > I think the FET is best placed in the negative leg of the heater
> > load, makes measurements and gate drive a lot simpler.  It
> > will not be as simple as the DIY-WB, but there is a trade off
> > here.  I use such a circuit.

> > Bruce Roe

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