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From: firstname.lastname@example.org (Gene De Guzman)
Subject: Re: HELP WITH INDUCTION SETUP
Date: 15 Nov 2002 11:00:37 -0800
NNTP-Posting-Date: 15 Nov 2002 19:00:37 GMT
Many thanks to your suggestion.
Could you let me know how I coulb make or to buy a precisely timed
I will try to answer your questions to the best of my untechnical
1) Is the core saturating magnetically?
---> There is a very strong magnetism on the core whenever the switch
is turned ON.
2) Are the resistances of the coils low enough?
--->I use a 1 millimeter wire with a lot of turns and another 3
millimeter with with fewer turns. The wires don't heat-up when I turn
the switch on/of.
Could you explain what you mean by:
12 Volts/55 Amps = 0.22 Ohms or less (unlikely).
1.2Volts/550 Amps = 0.0022 Ohms or less (forget it).
A car ignition coil can induce 12,000 DC Volts with a very low current
so if I use your formula ... 12,000 Volts / say 1 Amp = 1 Ohm ... this
is a high resistance but the coils does not burn ... am I wrong?
Please be gentle ... I really don't know much.
3) How are you measuring the pulsed voltages and currents?
---> I am using an oridinary Voltmeter and an Ampmeter. How much does
an oscilloscope and a current probe cost and what size to I need?
Does an oscilloscope work with DC?
As I understand it, I need an oscilloscope to that I will know
prescisely when to turn off the switch ... and this is when the
current reaches its peak which the oscilloscope will display ... is
Joseph Legris wrote in message news:<3DD40746.4C3B0E33@xympatico.ca>...
> A few issues you should address:
> 1) Is the core saturating magnetically?
> 2) Are the resistances of the coils low enough?
> 12 Volts/55 Amps = 0.22 Ohms or less (unlikely).
> 1.2Volts/550 Amps = 0.0022 Ohms or less (forget it).
> 3) How are you measuring the pulsed voltages and currents?
> You really need an oscilloscope and a current probe, or else some way
> of capturing and measuring the peaks.
> 4) A proper setup will have a primary of very heavy copper wire of maybe
> 10 turns and a secondary of 1 turn of heavy copper bar (maybe 1 cm
> diameter or more) wound coaxially on a big closed ferrite core (probably
> a few dozen sq. cm cross-sectional area)
> 5) You need a precisely timed pulse controller or else the result will
> be dangerous. If you attempt to pulse it by pushing a button (a 55 Amp
> rated button at that) any misjudgment in timing will fry the button,
> burn your transformer and possibly explode the battery.
> 6) You can get an approximation to what you need (maybe 200 Watts
> instead of 600) by taking apart a soldering gun. It runs on AC instead
> of pulsed DC and can give you more than 100 Amps at a couple of volts.
> Much safer.
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