Author Topic: Small Coil Build  (Read 260 times)

Offline flyingperson23

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Small Coil Build
« on: November 30, 2023, 02:23:01 AM »
So, I'm at college now and found there are Lots of free bits at the makerspaces around here, so with spare parts from a medium sized coil I built over the summer, I built this little guy.

Coils: 5.5 ish turns of 12awg for primary, exact tuning doesn't seem to matter much. I have no clue what the secondary is, but it's likely an early onetesla secondary. 2.375" OD, 6.25" height, arbitrary sized 3d printed toroid on top (I think 1.6x6.2?); basically zero effort put into the coils. The secondary has a bunch of holes in the insulation and a tendency to flash over and I could use a taller one, so it's prone to replacement once it burns out (2 candidates in the Bin Of Old OneTesla Secondaries I found this one in). Supports laser cut from 6mm acrylic.
Fres: 230khz, coupling: no clue but probably at least .2; barely low enough to not arc over.


Inverter specs:
BSM150 half bridge
300A OCD
I designed it for doubled (120v) mains input, but with the on times I'm using, increasing past normal rectified mains gives no performance boost and only increases flashovers, so normal rectified mains (~150Vbus) is perfectly adequate
100nF dawncap
UD2.9 w/ pulseskip
2x 200V 2200uF bus caps in series






I'm using mostly TMax midistick for the interrupter with 12% duty cycle max, 1000uS on time max. It gets warm but I can run it for 5 to 10 minutes continuous before it starts getting uncomfortably warm. The inverter is passively cooled and heats up ever so slightly faster than the coils themselves, so I get plenty of runtime especially if it's cool out and the inverter's 80C thermal switch trips before any damage can be done. I'm not sure how much power it uses as I don't have a working ampmeter, but I haven't tripped any breakers and the 18awg input cables get warm so I'd guess between 5 and 10 amps.

Videos:
https://youtube.com/shorts/gyPdY8dJFyg
https://youtube.com/shorts/9rdtgXvGxZM

Max recorded arc length is 17", and anything around 12" or below is thick and bright; the breakout point is quite discolored from the heat.
I built this coil to be portable, easy to run, and reliable for showing friends and family what tesla coils are like. Aside from the secondary on its last legs, I'm very happy with it so far.

I may try 2000us soon and see just how high can I go with this little guy, but for now another project (hint: Big drsstc) has priority.
« Last Edit: November 30, 2023, 02:42:18 AM by flyingperson23 »

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Small Coil Build
« on: November 30, 2023, 02:23:01 AM »

 


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