Injector cleaner/flow bench

[goflo at pacbell.net]

Justin Albury wrote:
> Have any of you guys out there made a Fuel Injector cleaner/flow bench
> be it stand alone or PC controled?????

Just built one. Uses regulated shop air for fuel pressure. Expelled
liquid ( solvent, not fuel! ) captured in lab burette. Circuit
is a PIC micro driving non-inverting input of op-amp thru an adjustable
voltage divider. Inverting input connected to sense resistor in emitter
of darlington driver. Use a healthy Zener from collector to
ground, & bypass everything. An auto battery works for power. Don't
forget a fuse!
Would post schematic but am internet challenged - Don't know how.
Intended to use a LM1949/555 at first, but need the flexibility of the
arrangement above. LM1949 would work fine, though, and would be 
easy to do. See data sheet on National Semiconductor site.

Jack