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Re: [TCML] Ever so slightly off topic. (NOTICE: Link may need editing)

I agree,
A high voltage 5 or 10A diode for each coil would be much more reliable. It does of course depend on the pulse width, repetition rate and ignition coil.
Although if it were me, I'd use a modern IGBT or power MOSFET rated at a minimum of 400V D-S with its own reverse diode, even then you need some sort of snubbing. I've found a cap across the ignition coil (like the condenser in a car ignition circuit) limits the peak voltage out (and back EMF to the transistors), but lengthens the output pulse. In my setups this give the maximum power out. 

    Derek

On 11-Jan-16 3:38 AM, Reverend Fuzzy wrote:

Ok, it's needed.  Now I'm curious as to why this particular diode is
popularly selected in this situation... since (as you say) a lot of current
flows through the diode, wouldn't something that can stand more than an amp
be more prudent?  Or are we at odds about what constitutes "a lot of
current" ?
---
Reverend Christopher "Fuzzy" Mayeux


-----Original Message-----
From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Ed
Sent: Sunday, January 10, 2016 5:09 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Ever so slightly off topic. (NOTICE: Link may need
editing)

Answer is yes, at least in my experience, and a lot of current flows
through the diode.  I forget the rules about attachments but I have a
file on the subject of ignition coils and ignition coil drivers
including schematics and pix and will send if big brother allows.

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