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Re: [TCML] DC Resonant Coil Questions

One of these days I'll get around to finishing my coil based on your scheme... One of these days...  Practically have all the parts done, just haven't had the chance to put it all together, lol.  Its been years...
Sent from my Verizon 4G LTE Smartphone
------ Original message------From: Steve Young Date: Thu, Aug 11, 2016 9:48 PMTo: 'Tesla Coil Mailing List';Cc: Subject:Re: [TCML] DC Resonant Coil Questions
David and Roger,Congrats on building DC powered Tesla Coils!  Although a bit more complex,they are a decided improvement over their AC powered cousins, and are morefun to play with.But wait - there's more!  If you want to further improve your DC coils, Irecommend you make one further addition to your setups.  Namely, add anotherpair of gaps to your rotary spark gap (RSG).  This allows you to DC resonantcharge your tank cap, then completely disconnect your power supply when yourtank cap discharges into your primary winding.Picture resonant charging your tank cap to about 2x the DC power supplyvoltage.  Then carefully disconnect the tank cap from the power supply andconnect it to your primary.  Then disconnect the cap from the primary andreconnect it to the charging circuit.  Repeat this cycle indefinitely.  Of course, the rotary spark gaps do the connecting and disconnecting.  Youcan see that when the tank cap discharges into primary, the DC supply iscompletely disconnected and totally unaffected by the discharge.  This isvery good.The second set of gaps allows you to automatically do the power supplyconnects and disconnects.  These gaps on your RSG should be spaced so theyare aligned half way between first gap alignments.  For example, if you have12 rotary electrodes, they will be spaced 30 degrees apart.  Tank capcharging will occur at rotor angles of 0, 30, 60, 90, 120 etc degrees.  Tankcap discharge into the primary will occur at 15, 45, 75, 105, 135 etcdegrees.With this arrangement, you can slow your RSG down as much as you want, evento 1 RPM!  If you try this with just a single gap RSG, once the rotor slowsdown enough for your charging reactor to saturate, you will get ugly flamingtrailing arcs in your RSG and huge current draws from your power supply -very bad!The other big advantage is that your charging reactor only needs to be abouta tenth of a Henry.  So it can be air core and easily constructed. Does this really work?  Absolutely!  Using 6 MOTS to power a twin 6 inchdiameter Tesla Coil, I got eight foot streamers and the power supply andde-Qing diodes really appreciated not being shorted every "bang".I got out of the TC hobby, but I still have the documentation.  If you wantmore details (diagrams, spread sheet calculations, etc.), send me an email.I would really like to hear of others trying this scheme.Steve Young  -----Original Message-----From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of David RiebenSent: Wednesday, August 10, 2016 6:45 AMTo: tesla Coil Mailing ListSubject: [TCML] DC Resonant Coil QuestionsHi all,I (along with my daughter and her husband) had a chance to visit Roger Smith(in Ohio) and get the personalized grand tour of his nice sized pole barnhigh voltage lab this past Saturday, August 6. Of course, the highlight ofthe visit was his huge, pole pig powered DC resonant Tesla coil! Of courselooking at Roger's DC res setup got the wheels to turning in my head abouthow I could possibly convert my Green Monster to run DC res instead ofasynch with raw and unfiltered AC strait from my pole pig. 
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