signal from coil and back emf......

[Dave J. Andruczyk]

> Simon
> Two answers to the question put a zener across the collector to the
> emitter pick a zener at ~14v or a bit  higher to snub cemf across the
> xsistor  or a diode across the coil is ok but it slows down the injector
> because of circulating current through the diode.
> Simon Quested wrote:

also may need a beefy diode due to the current spike tht will be present.
?( use a diode that can handle several amps surge.) the best snubber i've
seen uses a  zener and a regular diode across the collector emitter
juntion, the larger zener drop helps to speed  up fall time, but requires
a transistor that can higher reverse voltages ( due to the fact that the
zener won't conduct until a higher voltage..)

dave