Ignition Simulator

[David Cooley]

At 03:03 PM 3/15/2000, nacelp wrote:
>Well, another idea brings more questions.
>
>I have a DIS that uses a reluctor, notch, crank sensor.  The resistance of
>the oem sensor is about 1K ohms.  I thought using a 1K coupling transformer
>would be a grand idea to interface my digitial signal to the DIS module.
>Trouble is the transformer is 1K impedance, with only 50-60 ohms resistance,
>Is this a big isssue?,  I was figuring on triggering the transformer off of
>the voltage drop across a led...
>I gonna generate smoke, doing this?.
>Just that fumes bother me now...


Best bet is to put a 0.1UF cap in series with the output of the coupling 
transformer, and a 1K resistor across the DIS input.
Will limit the voltage and make the resistance proper.  Could also put back 
to back 5V zeners across the input to clamp the signal incase the voltage 
is still too high... I'd scope it before hooking it to the DIS just to be sure.

===========================================================
David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
We are Borg... Prepare to be assimilated!
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