>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 30 March 2005 11:52
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE]: MOSFet Troubles
>
>
>> Better still, use a 6 volt coil with an automotive "coil 
>resistor" in 
>> series with coil+
>
>What will a 6V coil give me that a 12V can't? 
>
>> add a "condenser" (small high voltage cap) from coil- to Gnd. and a 
>> 2.5Amp 1Kv diode from coil- to 12V.
>
>If I remember correctly the purpose of the condeners is to 
>stop buring and pitting of the points. I'm not using to the 
>coil to fire a spark plug so I can't think of a reason I would 
>need it. The diode I can see being needed as Russell McMahon 
>pointed out a flyback issue that most likely killed my FET.
>

The 'condenser' actually speeds up the collapse of the magnetic field in
the coil by preventing (or at least reducing) any arc forming across the
points that could sustain the primary current.  A contact breaker system
without the condenser produces a very weak spark.

Regards

Mike

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