Re: Solid-state coil (gate xfrmr question)

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Original poster: "Shaun Epp by way of Terry Fritz <twftesla-at-qwest-dot-net>" <scepp-at-mts-dot-net>


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, November 05, 2001 5:17 PM
Subject: Solid-state coil (gate xfrmr question)


> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<cwillis-at-guilford.edu>
>
> Hi folks,
>
> I just started toying with a solid-state coil setup that uses an IRF740
> driven by a 556 timer and a gate driver chip.  The thing is working pretty
> well, giving up to 5" of spark with about 70 watts in.  I'm confused about
> one thing in particular, though- the problematic isolation transformers I
> made to protect the driver circuit in case the transistor dies.  I have
> made three of them now, all having about 12 turns on the primary and
> secondary around different ferrite toroids I had lying around.  All have
> the same effect of keeping the coil from putting out as big a spark as
when
> the gate is driven directly.  So, if you know what ferrite material to
> select for a core, how big to make it, and how many turns should be
> required, please let me know!
>
> By the way...a big thanks to Richie Burnett for putting a great tutorial
on
> MOSFET coils on his website- it is really all I have had to go on and I
> know it has saved me many a blown FET...at least so far I still have the
> "original" one in there.
>
> Carl
>

Could you post that Web site address that has these tutorials on MOSFET
coils,

Thanks,
Shaun Epp