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@bellsouth.net Packet: N5XMT@KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068 We are Borg... Prepare to be assimilated! =========================================================== ---------------------------------------------------------------------------- To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes) in the body of a message (not the subject) to majordomo@lists.diy-efi.org