FIFTYGUY@xxxxxxx wrote:
In a message dated 3/12/08 8:55:33 A.M. Eastern Standard Time, pterren@xxxxxxxxxxxx writes:Lou Balint.http://www.pupman.com/listarchives/2003/September/msg00163.htmlCan somebody post a schematic of Lou's (or a similar) setup? From the Bert Hickman's post in the archives I can't fathom how to hook up a cap to the base of the secondary in a way that it doesn't interfere with the resonance of the system, yet discharges through the secondary. Is there a separate charging supply involved as well? -Phil LaBuddeCenter for the Advanced Study of Ballistic Improbabilities**************It's Tax Time! Get tips, forms, and advice on AOL Money & Finance. (http://money.aol.com/tax?NCID=aolprf00030000000001)_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
Hi Phil,If you use a comparatively large DC energy storage capacitor (comparable to the tank cap or larger), there should be virtually no effect on the RF characteristics of the secondary. The HV capacitor is simply connected between the base of the secondary and your RF ground. As you suspected, you will need to have a separate (and fairly robustly designed) HVDC supply to initially charge up the base capacitor. I think Lou used a couple of Maxwell pulse capacitors and a voltage doubler or tripler circuit.
Warning: This configuration is extremely dangerous, not only because of the added energy in the streamers (especially during snappy ground strikes), but also because of the retained charge on the base capacitor and secondary AFTER the coil is shut down. Your primary circuit should be well protected from any secondary strikes by using a strike rail connected to the RF ground. An accidental primary strike may otherwise take out your main HV supply and/or your tank cap. And, obviously, make sure that streamers cannot jump to anything they shouldn't... _especially_ anything connected to mains ground, such as conduit, zip cords, fluorescent lamps/fixtures, etc. A strike to these can take out the electronic equipment in your home. Even strikes to the concrete and rebar can be a problem due to differences in ground potential during high current discharges. I'd suggest making a counterpoise that covers the potential ground strike region. Connect one end of the base capacitor to the counterpoise (AND RF ground) so that YOU can control the current paths taken by high energy discharges.
This configuration is NOT for the inexperienced, the faint of heart, or folks with a small or basement lab... =<:^O
Bert
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