Forums

Step Up Pre Coil/Transformer

Started by Bret Cahill May 19, 2012
OK Honda no longer makes the original ignition coil that steps up the
voltage by 3 -4 orders of magnitude.

What's the easiest way to get a 40,000 volt spark out of a 12 volt ac
system with a 100X step up coil?


Bret Cahill



On 2012-05-19, Bret Cahill <BretCahill@peoplepc.com> wrote:
> OK Honda no longer makes the original ignition coil that steps up the > voltage by 3 -4 orders of magnitude. > > What's the easiest way to get a 40,000 volt spark out of a 12 volt ac > system with a 100X step up coil?
the ignition coil doesn't need a 3000:1 ratio to step the voltage up. the ignition system is a flyback circuit. If the coil is a transformer use the energy transfer circuit, this works by benerating a voltage spike in the magneto by interrupting the magneto current and putting the resulting voltage spike across the transformer primary. If it's a coupled inductor use the energy storage circuit which generates the voltage in the ignition coil by interrupting the coil's primary current. -- &#9858;&#9859; 100% --- Posted via news://freenews.netfront.net/ - Complaints to news@netfront.net ---
On Sat, 19 May 2012 00:56:20 -0700 (PDT), Bret Cahill
<BretCahill@peoplepc.com> wrote:

>OK Honda no longer makes the original ignition coil that steps up the >voltage by 3 -4 orders of magnitude. > >What's the easiest way to get a 40,000 volt spark out of a 12 volt ac >system with a 100X step up coil? > > >Bret Cahill > >
1. Apply 12 volts to the primary for some milliseconds, then interrupt it. A mechanical contact (aka "points") or a switch or relay contacts. Or a mosfet. 2. Use a dc/dc converter to charge a capacitor to a couple hundred volts and discharge that into the primary. All the stuff you need is inside a disposable flash camera. When I was a kid I used to dump a charged oil cap into a car coil through a thyratron tube. It was hard to insulate the output... it would punch an arc through practically anything. The only usable output connector was a plastic tube filled with motor oil. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators
On 5/19/2012 12:59 PM, John Larkin wrote:
> > > > When I was a kid I used to dump a charged oil cap into a car coil > through a thyratron tube. It was hard to insulate the output... it > would punch an arc through practically anything. The only usable > output connector was a plastic tube filled with motor oil. > > > >
Didn't your mother ever tell you you would arc your eye out with that?