Igniters => DIS

[Bob Wooten]

hmmmmmmmmm, there has to be a simple way to time this & keep $ & component
count down.  makes me think, & keeps the cob webs out of the head.

thanks amigo
BW

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Dan Zorde
Sent: Tuesday, February 27, 2001 10:59 PM
To: diy_efi at diy-efi.org
Subject: Re: Re: Igniters => DIS



Can't say that I have tried IGBT's, but I have seen data sheets for IGBT's
with TTL trigger inputs, kick back protection and were listed as being
designed for ignition systems.  Looked like you just had to connect one end
to coil primary and other end to gnd, and trigger it with a TTL signal.
However, these had NO dwell timing, so you would need to provide the coil
charge time from elsewhere.  These are not fully smart ignitors so be
careful the coil charge time.  You could set up a 555 timer to give you a
fixed on time for the IGBT.  Make sure you mount the IGBT's on a decent
heatsink as they will get pretty hot.

Dan  dzorde at erggroup.com

<Date: Tue, 27 Feb 2001 21:07:00 -0800
<From: "Bob Wooten" <r71chevy at earthlink.net>
<Subject: RE: Igniters => DIS
<
<thanks for the input.  have you (or anyone on the list) used the IGBT for
<igniters?  from what I can see of their usage (& the spec sheet), they can
<be put into an application where you would normally use a smart igniter
but
<you don't have to worry about current limiting or them overheating (or the
<kickback but you would expect that).  am I missing something or does the
<same apply & I would smoke it if you hold it on for too long?
<
<I have been working on my little DIS project & am counting on the coil
<charging for a maximum of 3/4 of a rev of the crank.  this being the case
@
<idle the circuit would have the longest "on" time @ 23.1 mS @ 650 RPM, &
the
<shortest time of 1.5 mS @ 10K RPM (yea like my stroker is going to get to
<10K, God I hope not or I will put small bits of stroker all over the
road).
<think that this would be too long @ idle?  I am going to mock it up with
<LED's @ first & the plug the coils in later & see what happens.
<
<I have an updated print with more notes & pinouts if anyone is interested.
<
<if this does happen to be too long a charge time then maybe I will give
<James a ring & see if I cant get some of those smart igniters from him &
<skip the IGBT all together.  I would much rather pay the $4 each than $30
<each for igniters though.  specially if I goto CNP ($30 X 8 = too much)
<
<thanks to all
<BW
<
<ps using outlook now so should be no junk in the archives but what I type.



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