Current load of Injector driver

[rr]

The parts from another '747 could be used to build two additional
drivers. Each of the four drivers would need to have separate outputs.
Two drivers can be triggered by one input, the other two by the
other input. This would work nicely for 2-2bbls or a 4-bbl TBI.

Be aware that a driver circuit consist of an 8-pin dip, the output
transistor (in TO-220 case) and a couple of caps, resistors & diodes.

I haven't examined the circuit layout (PCB) too closely. However,
the parts are grouped together on the board. It might be possible to
cut out that area of board and use it. The output transistors of course
are mounted to a heat sink. With a little ingenuity the two additional
drivers could be mounted inside of an existing '747.

BobR.

Shannen Durphey wrote:

> Question from the back of the room...
>
> For the "external driver box impaired,"  is it possible/practical to scrounge the
> injector drivers from another tbi ecm and connect them to the 7747 in parallel w/
> original injector drivers?
>
> How about "mostly parallel," with the outputs separated?
>
> Shannen
>
> rr wrote:
> >
> > Won't burn out the drivers if in parallel or series. The drivers are
> > current limited. Still recommend an external driver box.
> >
> > BobR.
> >
> > David & Cheryl Haggard wrote:
> >
> > >    In the 1227747 ECM, can the injector drivers safely handle 4 TBI
> > > injectors (2 per line) without burning out? I'm working on mounting a pair
> > > of 2.8-litre V6 TBI's on a dual-quad manifold. Need to determine if I need
> > > to build an external driver circuit.
> > >
> > > Dave Haggard
> > >
> > > ----------------------------------------------------------------------------

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