NNTP-Posting-Date: Sat, 04 Jan 2003 19:56:30 -0600
From: "Arthur Jernberg"
Subject: Re: High Voltage from car parts. Help me please.
Date: Sat, 4 Jan 2003 20:56:34 -0500
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May want to try a solid state switching circuit to control the pulse width
and frequencies presented to the HV transformer you are using. The
distributor will only produce a limited amount of HV depending on the input
voltages and the rotational speeds.
"P!erCer" wrote in message
> I am working on a "lifter" project (details at
> First, I tried powering my lifter with a monitor, but burned up some
> of the components. Then my dad put together my current power source,
> a 12 volt battery running a distributor that drives a car ignition
> coil. Unfortunately, my lifter still didn't lift. For weeks, I
> worked on getting my design lighter. I am under 2 grams now for 36
> inches of lifting surface, and have *almost* achieved lift. The
> device skitters a bit across the table, and when suspended from the
> ceiling moves sideways enthusiastically. Unfortunately, I don't see
> any way to remove more weight. The foil doesn't even have balsa wood
> under it anymore, it is supported by its own curve and the tension of
> the top wires. My dad and I began investigating our power source, and
> found it might have some issues. Here are a few questions:
> A) The speed of the distributor motor is controllable via a
> potentiometer. We have noticed that the slower the motor turns, the
> higher the voltage produced. The higher the speed, the lower the
> voltage. At the same time, the power seems to "pulse." The lower the
> speed, the farther the pulses are apart. This, I believe, is where
> the power source is failing. The pulses at the required voltage are
> too far apart to hover the lifter. Is this logical? The lifter
> should only need a few milliamps to operate.
> A2) Just curious, is more voltage being produced at lower RPMs
> because the coil has more time to saturate?
> B) Keeping A in mind, is there any way to have increased voltage at
> the faster pulse speeds? The distributor is module-based, so we can't
> simply increase the input voltage. We happen to have an unlimited
> supply of car ignition coils (hundreds) so doing something with those
> might be an option.
> C) Any other suggestions for improving this power source?
> Thanks for your help,
> Jason T