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From: Kevin McMurtrie
Subject: Re: Ignition Coil High Voltage Power Supply
User-Agent: MT-NewsWatcher/3.2 (PPC Mac OS X)
Date: Sun, 12 Jan 2003 05:36:15 GMT
NNTP-Posting-Date: Sat, 11 Jan 2003 21:36:15 PST
In article ,
Thoremail@example.com (P!erCer) wrote:
> I am constructing an ignition coil based high voltage power supply
>to power my lifter (I have posted here before). At this point, I am
>running into problems. My lifter somehow isn't getting the proper
>power to lift, even though the sparks can be adjusted to be upwards of
>two inches long. Please help.
>My basic system is: 12 volt battery running a distributor that
>switches the coil.
>A) Is the output of my coil AC or DC? How do I check? I want pure or
>B) Why doesn't my voltage increase when I put two coils in parallel?
>C) What do you predict the waveform of my output looks like?
>I have two ideas why my lifter isn't working. One person on this
>group told me the coil was producing AC, and that would mess up the
>ion behavior around the lifter. My belief was that the pulses were
>coming too far apart to fully charge the lifter (it functions as a
>Would it help if I half-wave rectified the signal going from
>distributor to coil? Two wires go from the distributor to the coil,
>then one from coil to ground. That is why I suspect AC...though why
>would they need a ground?
>Thanks a bunch,
The coil produces AC, kind of:
--- |||--- 0V
You do need a half wave rectifier! The flyback pulse has about 30x the
voltage of the charge pulse so you need to half-wave recitify it with
the proper polarity.
Here's a trick that won't blow your DVM or diode - Create a continuous
arc between two thin wires. The wire that's negative during the HV
flyback spike will get hotter than the other.
Get rid of your distributor. A 555 timer chip driving 500V 6A MOSFET
weighs a whole lot less.
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