Re: DF-DRSSTC 15 was OL-DRSSTC 14

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>

Looks terrific.  I think I may order some parts :)
(enjoyed the video, BTW)  What's the longest you've
run the thing for?

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: Terry Fritz
> <vardin@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi All,
>
> I guess I really like Direct Feedback - DRSSTC :-))
>
> So DF-DRSSTC it is!!
>
> The latest schematic is here:
>
> http://hot-streamer.com/temp/DF-DRSSTC-SCHEMATIC.pdf
>
> The latest parts list is here:
>
>
http://hot-streamer.com/temp/DF-DRSSTC-MasterPartsList.pdf
>
> I am keeping the bias resistors at 47K since they
> seem to work just fine.
> I put in the inrush current limiter and made the big
> line inductor an option.
> The fuse is 10 amps now.
> The trigger circuit tuning coil is on the schematic
> now.
>
> A lot of cost could probably be trimmed off that.
> Like winding 100
> turns of 4 strand of #24 wire around DigiKey
> #240-2120-ND (not
> tested!) which would take off $25.  The PC board
> could probably be
> done without for another -$20.  Some scrap aluminum
> and a hack saw
> could make heat sinks for -$12....  You really don't
> need the $16 big
> inductor coil...  If you have a good strong little
> fan, that saves
> $12...  So there goes $85 right there bringing the
> cost to about
> $70...  That is darn cheap for ANY Tesla coil ;-))))
>  Of course, you
> still have the cost of the coil itself...
>
> Here is a picture of the thing on a 12 inch square
> pad:
>
>
http://hot-streamer.com/temp/DF-DRSSTC-2005-10-17-001.jpg
>
> It weighs 900 grams total.  The fan is 280 grams of
> that.  10% the
> weight of my "old" DRSSTC ;-))
>
> Here is the input circuit with the fuse, big diode,
> and inrush current limiter.
>
>
http://hot-streamer.com/temp/DF-DRSSTC-2005-10-17-002.jpg
>
> The buss capacitor array:
>
>
http://hot-streamer.com/temp/DF-DRSSTC-2005-10-17-003.jpg
>
> The trigger circuit with the new parts I just got
> from DigiKey.  The
> ceramic resistor is at 50C instead of 150C now ;-)
>
>
http://hot-streamer.com/temp/DF-DRSSTC-2005-10-17-004.jpg
>
> The H-bridge and CTs:
>
>
http://hot-streamer.com/temp/DF-DRSSTC-2005-10-17-005.jpg
>
> I put may development notes (OL-DRSSTC posts) in
> this document for
> those that missed it ;-)
>
> http://hot-streamer.com/temp/DF-DRSSTC-Notes.pdf
>
> I just updated the thing with the new parts and
> wrote this up today...
>
> There will probably not be regular updates now
> unless I figure out
> something new.  I did not try to fine tune or
> optimize it much.  So
> there are probably a bunch of improvements that can
> be made for
> sure!!  All this was just to take it from "concept
> to coil".  It all
> went very well :-))))
>
> Cheers,
>
> 	Terry
>
>
>