[Diy_efi] Re: injector current-feedback driver

[Greg Hermann]

At 11:15 AM 3/4/03, Alexei Pavlov wrote:
>cell at x-dsl.hu wrote:
>>

Why re-invent the wheel ??--Take a peek at the print hammer throw circuitry
from the final generation of high-speed, electromechanical teletype
printers. Throwing a print hammer is not much different at all from moving
an injector pintle.

Greg

>> Hi Mark,
>>
>> > An HC device and a FET are the best combination to possibly make this work
>> > well.
>>
>> Now I'm confused if HC output is sufficient or not.
>> Maybe it depends on the particular FET?
>
>In fact it's simple. The problem with power FETs is their gate cap.
>Take the gate C from datasheet and find the max current you'll get
>to open the FET. If the current is too high you'll want to limit it,
>but this will make circuit open slower.
>Some HC bus drivers must be able to drive 24mA.
>
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