Which Diode?

Article View: sci.electronics

Article #10659

#10659

From: Robert Gallant
Date: Mon, 28 Sep 1992 12:12

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Hi, I am trying to find the proper diode to combine the trigger signals
from two ignition coils on my car.

This combined signal is used to trigger a new fuel injection computer
(so there will be little to no current through the diodes).

Here is a diagram:
				D1
			  ------>|----------------------------|
			  |                              D2   |---OUT
	 (+)       (-)    |       (+)       (-)       --->|---|
	 ==        ==-----|       ==        ==--------|
       ----------------   |     ----------------      |
       -              -   |     -              -      |
       -  Coil 1      -   |     -   Coil 2     -      |
       -              -   |     -              -      |
       ----------------   |     ----------------      |
			  |                           |
			 ---                         ---
			 --- Condensor 1             --- Condensor 2
			  |                           |
			  |                           |
			 GND                         GND

This is the stock setup except for the two diodes.

The voltage present at the (-) terminals should be alternating between
0 and +14.1 volts at 300 Hz maximum.

I have tried 1N4148 diodes with a 100K ohm resistor from OUT to GND.
The diodes went bad immediately.

Any help would be appreciated.

Rob
gallant@oasys.dt.navy.mil

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Path: arc1-ca.pugleaf.net!sparky!uunet!haven.umd.edu!darwin.sura.net!dtix!oasys!gallant
From: gallant@oasys.dt.navy.mil (Robert Gallant)
Newsgroups: sci.electronics
Subject: Which Diode?
Message-ID: <25587@oasys.dt.navy.mil>
Date: 28 Sep 92 12:12:04 GMT
Reply-To: gallant@oasys.dt.navy.mil (Robert Gallant)
Organization: David Taylor Research Center, Bethesda, MD
Lines: 36