From: John Larkin
Subject: Re: Ignition Coil High Voltage Power Supply
Date: Sat, 11 Jan 2003 21:57:18 -0800
Organization: Posted via Supernews, http://www.supernews.com
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On Sun, 12 Jan 2003 05:36:15 GMT, Kevin McMurtrie
>In article ,
> Thorfirstname.lastname@example.org (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:
> | Flyback
>--- |||--- 0V
> |_____|| Charge
A car-type ignition coil will have an output that's a damped
sinusoidal ring, and goes about equally positive and negative. There's
a lot of capacitance in the system, some deliberate and some
distributed in the windings.
You can just hold a scope probe near some spark-plug wires to see the