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Subject: Re: Diode schematic help ??
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Date: 10/31/00 at 5:15 PM
Posted by: Alan Dorman
In Reply to: Diode schematic help ?? posted by Dick Jenkinson on 10/30/00 at 3:58 AM:
First you need to know how much current the lights draw. This will determine the current rating of the diode. If the lamps use, say, one amp you should use a 5 amp diode. This is because the inrush current when the lamps first turn on can be up to 5 times the normal operating current. Why? Because when you first turn a light bulb on the filament is cold and it looks like a short. It is not till the filament heats up that it draws less current andstarts acting like a resistor.
Next is the PIV rating of the diode. This is how much reverse voltage the diode can take before it releases the smoke stored inside it. Cars use a 12 volt system so a diode with a PIV rating of 50 Volts or more should work fine.
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