Mail for:- n.mulvana at e-eng.hull.ac.uk

postmaster at hull.ac.uk postmaster at hull.ac.uk
Sun Oct 8 01:42:45 GMT 1995


Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

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From: postmaster at hull.ac.uk
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          id <08792-0 at mailhub1.hull.ac.uk>; Sun, 8 Oct 1995 01:11:24 +0100
Date:     Sun, 8 Oct 1995 01:11:22 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
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Your Message:-
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From: postmaster at hull.ac.uk
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          id <07304-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 23:45:29 +0100
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To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
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Your Message:-
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From: postmaster at hull.ac.uk
Message-Id: <199510072135.RAA12221 at coulomb.eng.ohio-state.edu>
Received: from hull.ac.uk by mailhub1.hull.ac.uk           
          id <05905-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 22:29:08 +0100
Date:     Sat, 7 Oct 1995 22:29:07 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
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Your Message:-
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          id PAA11041; Sat, 7 Oct 1995 15:54:53 -0400
From: postmaster at hull.ac.uk
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Received: from hull.ac.uk by mailhub1.hull.ac.uk           
          id <04167-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 20:47:56 +0100
Date:     Sat, 7 Oct 1995 20:47:54 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
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          id SAA10148; Sat, 7 Oct 1995 18:27:03 GMT
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          id OAA10134; Sat, 7 Oct 1995 14:26:49 -0400
From: postmaster at hull.ac.uk
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          id <02690-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 19:19:19 +0100
Date:     Sat, 7 Oct 1995 19:19:17 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
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          id MAA08836; Sat, 7 Oct 1995 12:47:48 -0400
From: postmaster at hull.ac.uk
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          id <01033-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 17:41:43 +0100
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To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
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From: postmaster at hull.ac.uk
Message-Id: <199510071457.KAA08059 at coulomb.eng.ohio-state.edu>
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          id <28786-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 15:49:41 +0100
Date:     Sat, 7 Oct 1995 15:49:40 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
Received: from coulomb.eng.ohio-state.edu by chopin with SMTP internet(PP);
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          id NAA07553; Sat, 7 Oct 1995 13:33:20 GMT
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          id JAA07539; Sat, 7 Oct 1995 09:33:12 -0400
From: postmaster at hull.ac.uk
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Received: from hull.ac.uk by mailhub1.hull.ac.uk           
          id <27500-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 14:26:49 +0100
Date:     Sat, 7 Oct 1995 14:26:48 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
Received: from coulomb.eng.ohio-state.edu by chopin with SMTP internet(PP);
          Sat, 7 Oct 1995 14:26:05 +0100
Received: by coulomb.eng.ohio-state.edu (940816.SGI.8.6.9/940406.SGI)	for diy_efi-outgoing 
          id MAA07129; Sat, 7 Oct 1995 12:14:38 GMT
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          via ESMTP (940816.SGI.8.6.9/940406.SGI)	for <DIY_EFI at coulomb.eng.ohio-state.edu> 
          id IAA07114; Sat, 7 Oct 1995 08:14:30 -0400
From: postmaster at hull.ac.uk
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Received: from hull.ac.uk by mailhub1.hull.ac.uk           
          id <26298-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 13:07:53 +0100
Date:     Sat, 7 Oct 1995 13:07:51 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
Received: from coulomb.eng.ohio-state.edu by chopin with SMTP internet(PP);
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          id KAA06729; Sat, 7 Oct 1995 10:56:27 GMT
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          id GAA06715; Sat, 7 Oct 1995 06:56:21 -0400
From: postmaster at hull.ac.uk
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          id <25017-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 11:49:31 +0100
Date:     Sat, 7 Oct 1995 11:49:30 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
Received: from coulomb.eng.ohio-state.edu by chopin with SMTP internet(PP);
          Sat, 7 Oct 1995 11:48:25 +0100
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          id JAA06323; Sat, 7 Oct 1995 09:33:56 GMT
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          via ESMTP (940816.SGI.8.6.9/940406.SGI)	for <DIY_EFI at coulomb.eng.ohio-state.edu> 
          id FAA06309; Sat, 7 Oct 1995 05:33:51 -0400
From: postmaster at hull.ac.uk
Message-Id: <199510070933.FAA06309 at coulomb.eng.ohio-state.edu>
Received: from hull.ac.uk by mailhub1.hull.ac.uk           
          id <23841-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 10:25:55 +0100
Date:     Sat, 7 Oct 1995 10:25:53 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
Received: from coulomb.eng.ohio-state.edu by chopin with SMTP internet(PP);
          Sat, 7 Oct 1995 10:25:12 +0100
Received: by coulomb.eng.ohio-state.edu (940816.SGI.8.6.9/940406.SGI)	for diy_efi-outgoing 
          id IAA05911; Sat, 7 Oct 1995 08:20:38 GMT
Received: from chopin.ucc.hull.ac.uk by coulomb.eng.ohio-state.edu 
          via ESMTP (940816.SGI.8.6.9/940406.SGI)	for <DIY_EFI at coulomb.eng.ohio-state.edu> 
          id EAA05892; Sat, 7 Oct 1995 04:20:33 -0400
From: postmaster at hull.ac.uk
Message-Id: <199510070820.EAA05892 at coulomb.eng.ohio-state.edu>
Received: from hull.ac.uk by mailhub1.hull.ac.uk           
          id <22874-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 09:14:32 +0100
Date:     Sat, 7 Oct 1995 09:14:31 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
Received: from coulomb.eng.ohio-state.edu by chopin with SMTP internet(PP);
          Sat, 7 Oct 1995 09:14:11 +0100
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          id HAA05457; Sat, 7 Oct 1995 07:01:46 GMT
Received: from chopin.ucc.hull.ac.uk by coulomb.eng.ohio-state.edu 
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          id DAA05442; Sat, 7 Oct 1995 03:01:42 -0400
From: postmaster at hull.ac.uk
Message-Id: <199510070701.DAA05442 at coulomb.eng.ohio-state.edu>
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          id <21626-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 07:55:50 +0100
Date:     Sat, 7 Oct 1995 07:55:48 +0100
To: DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Mail for:- n.mulvana at e-eng.hull.ac.uk 
Sender: owner-diy_efi at coulomb.eng.ohio-state.edu
Precedence: bulk
Reply-To: DIY_EFI at coulomb.eng.ohio-state.edu

Hi,
 This message has been generated in response to your message below.
The central mail system is unable to deliver your message
as there are a number of people with the same initials and surnames.
Please select the appropriate e-mail address from the list shown below 
and try again:-


Any questions or problems, please call or email
    Alex Sharaz
    Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk

----
===============================
/usr/local/bin/osimail: Command not found
===============================
Your Message:-
Received: from coulomb.eng.ohio-state.edu by chopin with SMTP internet(PP);
          Sat, 7 Oct 1995 07:55:31 +0100
Received: by coulomb.eng.ohio-state.edu (940816.SGI.8.6.9/940406.SGI)	for diy_efi-outgoing 
          id FAA04969; Sat, 7 Oct 1995 05:35:40 GMT
Received: from chopin.ucc.hull.ac.uk by coulomb.eng.ohio-state.edu 
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          id BAA04955; Sat, 7 Oct 1995 01:35:34 -0400
From: postmaster at hull.ac.uk
Message-Id: <199510070535.BAA04955 at coulomb.eng.ohio-state.edu>
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From: arthurok at ix.netcom.com (ARTHUR OKUN )
Subject: Re: Building an MSD-CD
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You wrote: 
>
>Okay, I went down to the library and got everything I could on high 
voltage
>stuff...
>
>First, let's look at a spark gap. Essentially, you've got an 
insulating gap
>(of air in this case). The conductivity of this gap is essentially 
miniscule
>under normal conditions. When you hit a particular voltage (which 
pretty much
>has to be determined experimentally) or higher, then the electrons 
will go
>into a type of "avalanche" mode where the conductivity of the gap goes 
way up
>(alternatively, the resistance goes way down). We won't have electrons
>accelerated fast enough to make a difference, so for our purposes, the 
time
>it takes for the gap to go into breakdown/avalanche mode is about 
10^-8 secs.
>(about 10 nanoseconds). After this occurs, the air affected in the gap 
will
>be in a plasma-like state.
>
>Second, all capacitive high voltage impulse type circuits work by 
feeding
>the output of a high voltage power source to the capacitor and 
charging it up.
>When the voltage reaches the breakdown voltage of the spark gap, the 
capacitor
>rapidly dumps the charge it held. So this means we really need a high 
voltage
>DC-DC convertor (boost convertor). These types of circuits are also 
known as
>charge pumps. These things look like this:
>
> +----------+---Inductor-----+-----Diode >|-------------+--------Spark 
gap--+
> |          |                |                          |              
     |
> +          |                |                          |              
     |
>Battery   Capacitor 1      Switch                    Capacitor 2       
     |
> -          |                |                          |              
     |
> |          |                |                          |              
     |
> 
+----------+----------------+--------------------------+----------------
---+
>
>Okay, this is the basic circuit. I've deleted the usual control 
circuitry
>since we're not going to have to worry about creating a DC voltage of 
X at
>say +/-0.1 volts (this would be some sort of sensor or transformer on 
the
>high voltage side). Capacitor 1 is just there to smooth out the 
battery
>power.
>
>Okay, close the switch. The inductor starts charging up. Now open the 
switch.
>The collapsing magnetic field in the inductor continues to conduct via 

>capacitor 2. Continue toggling the switch until the spark gap reaches
>breakdown and drains the capacitor. This is pretty much identical to 
the
>old flyback circuit in television sets. In practice, you'd use a high 
voltage
>transistor (power FET or IGBT) in place of the switch and add some 
digital
>controls to it for gating and such.
>
>If you are a mechanical engineer, the inductor and capacitor store 
energy.
>Since the inductor is a coil of wire, it takes time for the flow in 
the
>inductor to reach the peak. The diode is essentially a "one-way 
valve". The
>Switch is a "2-way valve" and the battery is a pump. We build up a 
good flow
>in the inductor, which acts like a piston; it builds up inertia (not 
sure what
>the fluid term for this action is). Then open the switch (2-way 
valve). The
>capacitor is more like a dam (holds whatever head we build up in it). 
So
>the flow continues out of the inductor and builds up in the capacitor 
as long
>as there is still inertia remaining in the inductor to drive the flow.
>Successive cycles of the switch build up a higher and higher head in 
the
>capacitor until the "dam" collapses (the spark gap fires), causing the 
charge
>that built up in the capacitor to flow out.
>
>There is another variation on this circuit, as follows.
>
> +----------+---Switch-------+  +--Diode >|-------------+--------Spark 
gap--+
> |          |                |  |                       |              
     |
> +          |                |  |                       |              
     |
>Battery   Capacitor 1      Transformer               Capacitor 2       
     |
> -          |                |  |                       |              
     |
> |          |                |  |                       |              
     |
> +----------+----------------+  
+-----------------------+-------------------+
>
>In this case, the switch-inductor circuit acts as before on the 
transformer
>primary. When the field collapses, the transformer secondary feeds 
charge
>into Capacitor 2. The difference is that the turns ratio of the 
transformer
>gives you an additional voltage multiplication. Other advantages are 
isolation
>and in DC-DC convertors, the transformer version can be smaller than 
the
>inductor version (not sure if this applies for this application).
>
>There is another version called the buck-boost convertor. In this 
case, you
>can get high negative voltages rather than positive voltages.
>
> +----------+---Switch-------+-----Diode |<-------------+--------Spark 
gap--+
> |          |                |                          |              
     |
> +          |                |                          |              
     |
>Battery   Capacitor 1      Inductor                  Capacitor 2       
     |
> -          |                |                          |              
     |
> |          |                |                          |              
     |
> 
+----------+----------------+--------------------------+----------------
---+
>
>Notice that the only real change is the diode is reversed. In this 
circuit,
>the battery is out of the loop when the switch is open. The inductor 
conducts
>as before but it reverses the flow in the capacitor-spark gap circuit.
>
>There are also voltage multiplier ladders made out of spark gaps and
>capacitors and also voltage multiplier ladders made out of diodes and
>capacitors, but they are generally not as efficient in their power 
usage as
>the circuits above.
>
>When the above circuits are used as DC-DC convertors, Capacitor 2 is 
enormous
>so that the voltage ripple is minimized. The spark gap becomes a 
normal load.
>Even computer "switching power supplies" use similar convertors to the 
above
>circuits. A pair of resistors is attached on the "high voltage" side 
or as
>an additional small secondary on the transformer. This is used as the 
input
>to the control circuit. The control circuit usually varies the duty 
cycle
>(on-time to off-time of the switch) although some versions vary the 
frequency.
>The resulting voltages are as follows:
>
>Boost convertor: Vout=Vin/(1-Duty Cycle)
>Buck-Boost: Vout=-Vin*(Duty Cycle)/(1-Duty Cycle)
>Transformer Coupled Boost Convertor: Vout=Vin*N*(Duty Cycle)/(1-Duty 
Cycle)
>	where N is the turns ratio
>
it shouldnt be that difficult to build a simple dc-dc 
converter(12v-~300vdc) and a coil switching circuit with cheap tv type
components  the trick is to put a capacitor accross the output 
transistor junction just like the condensor in an old fationed
kettering type ignition circuit  thats also done in tv h.v.supplies 
which i am familar with



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