Mail for:- n.mulvana at e-eng.hull.ac.uk
postmaster at hull.ac.uk
postmaster at hull.ac.uk
Sat Oct 7 22:51:38 GMT 1995
Hi,
This message has been generated in response to your message below.
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Any questions or problems, please call or email
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Voice +44 1482 465700
Janet:A.Sharaz at uk.ac.hull.ucc
Internet:A.Sharaz at ucc.hull.ac.uk
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id <05905-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 22:29:08 +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
----
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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
----
===============================
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Your Message:-
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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
----
===============================
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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
Date: Sat, 7 Oct 1995 17:41:39 +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 KAA08059; Sat, 7 Oct 1995 10:57:03 -0400
From: postmaster at hull.ac.uk
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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
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Your Message:-
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id JAA07539; Sat, 7 Oct 1995 09:33:12 -0400
From: postmaster at hull.ac.uk
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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
----
===============================
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Your Message:-
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id IAA07114; Sat, 7 Oct 1995 08:14:30 -0400
From: postmaster at hull.ac.uk
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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:-
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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
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Your Message:-
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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
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Your Message:-
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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>
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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
Received: by coulomb.eng.ohio-state.edu (940816.SGI.8.6.9/940406.SGI) for diy_efi-outgoing
id HAA05457; Sat, 7 Oct 1995 07:01:46 GMT
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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
via ESMTP (940816.SGI.8.6.9/940406.SGI) for <DIY_EFI at coulomb.eng.ohio-state.edu>
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>
Received: from hull.ac.uk by mailhub1.hull.ac.uk
id <19722-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 06:29:23 +0100
Date: Sat, 7 Oct 1995 06:29:10 +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 EAA04581; Sat, 7 Oct 1995 04:26:04 GMT
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id AAA04567; Sat, 7 Oct 1995 00:25:59 -0400
From: postmaster at hull.ac.uk
Message-Id: <199510070425.AAA04567 at coulomb.eng.ohio-state.edu>
Received: from hull.ac.uk by mailhub1.hull.ac.uk
id <18456-0 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 05:19:49 +0100
Date: Sat, 7 Oct 1995 05:19:40 +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);
Sat, 7 Oct 1995 05:18:59 +0100
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id DAA04213; Sat, 7 Oct 1995 03:27:50 GMT
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id XAA04199; Fri, 6 Oct 1995 23:27:43 -0400
From: postmaster at hull.ac.uk
Message-Id: <199510070327.XAA04199 at coulomb.eng.ohio-state.edu>
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id <17227-1 at mailhub1.hull.ac.uk>; Sat, 7 Oct 1995 04:20:41 +0100
Date: Sat, 7 Oct 1995 04:20:40 +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.
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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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