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Zeke3 · 02-18-2022, 02:25 PM

The diode should be sized for the current and voltage it is going to be exposed to. What is the resistance of the primary circuit of the coil you will be using and the battery voltage? You can calculate the current using Ohm's Law, E=IR. That should get you in the ball park, unless I screwed something up.

02-18-2022, 02:25 PM	#5
Zeke3 Senior Member Join Date: Dec 2014 Location: Columbus, IN Posts: 1,591	Re: what size diode do I need The diode should be sized for the current and voltage it is going to be exposed to. What is the resistance of the primary circuit of the coil you will be using and the battery voltage? You can calculate the current using Ohm's Law, E=IR. That should get you in the ball park, unless I screwed something up.