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From: "Frithiof Andreas Jensen"
Subject: Re: Ignition Coil Power Supply Final Question
Date: Wed, 15 Jan 2003 14:32:52 +0100
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Anthony Q. Bachler" wrote in message
> I personally would connect a diode across the coil in reverse bias mode so
> that when the field collapses the current flows through the coil.
That will cause most of the power to be expended circulating a current in
the diode + primary winding.
Instead, do like they do in the car: Fit a capacitor across the transistor -
the capacitor needs to be large enough to keep the voltage below what the
transistor will tolerat.
The 2N3055 will not take much overvoltage!!
You are *much* better off with one of the BU208 -> BU2020 "line output"
transistors; they are designed for this and can withstand up to 1200 V if
the base is driven properly (you may want to be careful with the case)!
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