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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
RayeR Oct 7 2005
This is my first TC secondary from year 2001, formerly designed to use in SGTC but after some years I redesigned parimary to use as VTTC driven by GU-81M. Secondary: 4 x 25 cm, 900 turns by 0.28 mm wire Primary: 11 x 8.3 cm, 18,3 turns by 2.26 mm wire Feedback: 11 x 2.1 cm, 20 turns (taps at 10 and 15) by 0.4 mm wire Tank cap: 0,76nF / 11kV (3 x MICA) f0 = 1,26 MHz, k = 0.235
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
RayeR Oct 7 2005
Here's my 2nd TC - miniTC (2002) inspired by Sam Barros wounded on vitamine tube. It was designed as SGTC powered by small NST. My first primary design was wrong coz I got many flahovers between primary and secondary which burned my secondary So I had to start all again, now redesigned with flat-spiral primary and no flashing between pri-sec now.
Secondary: 2.7 x 8.2 cm, 500 turns by 0.16 mm wire Primary: 5.1->8.3 cm, 4.6 turns by 1.75 mm wire Tankcap: 2.2nF / 15kVAC NST: 5kV / 120 VA SG: static, divided, 5 Cu pipes f0 = 2.47 MHz, k = 0.142
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
RayeR Oct 7 2005
This is my 3rd TC from year 2003, little bit larger coz I plan it for SSTC. It was driven by MOSFET (IRFP460) half-bridge, powered by 1-way rectified mains, filtered by choke, thyristor preregulator and optional 220/390/(220+390)uF filter cap. I use DRSSTC mode because in classic SSTC the result was poor. Later I replaced popping MOSFETs by fast fairchild IGBTs FGH50N6S2D which works fine. Tank cap. is connected in serial with primary coil which decrease impedance to driver and increase voltage on primary side. I can get up to 40cm sparks at about 900W of input power. I'm quite satiftied with this TC, except it can't run too long coz sec. wire is overheating.
Secondary: 6.3 x 41 cm, 2000 turns by 0.2 mm wire Primary: 11.2 x 8 cm, 13.75 turns by 2.0 mm wire Feedback: 11.2 x 1.7 cm, 16 turns (2, 8 taps) - unused with SSTC Tank cap.: 12.3 nF / 4.5kV MMC (8 strings parellel, 3 caps./string) f0 = 335 kHz, k = 0,36
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
RayeR Oct 7 2005
When somebody started "the world smallest SSTC" thread here I also tried to make something small. It's not the smallest one but easy portable and still powerfull. The design is not completted yet, I have to build some controll generator/PLL/feedback circuit for driving halfbridge.
Secondary: 2.1 x 3.1 cm, 470 turns by 0.066 mm wire Primary: 3.6 x 1.6 cm, 4.8 turns by 2.2 mm wire f0 = 2.6 MHz, k = 0,4 SSTC: halfbridge 2 x IRF640, UCC27321, UCC27322, GDT hf toroid with 12 turns, 1ohm gate resistors.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
RayeR Oct 7 2005
Now going from extreme to extreme, I just started to make my biggest TC. I had to wound two times, in first time the wire break in 1/3 of sec. and had to start again but when I consumed all wire I saw that damned 1/3 is missing to finish the coil. So I bought new wire and started it all again. Now I have secondary completted and varnished, thinking about primary (wanna try VTTC and DRSSTC).
Secondary: 16 x 87 cm, 2450 turns by 0.35 mm wire Primary: not yet, but for VTTC it seems to be f*king huge... ...to be continued (updated)
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Steelwolf Oct 28 2005
My biggest coil so far Specifications: Sec: 11cm x 60cm Prim: about 9 windings made of 10mm copper-tube , 5 in use Tank.Cap: 55nF made of 3 strings with ECPOS-FKP caps Toroid is made of a 1meter long and 10cm thick Alu-Ducting Sparkgap: Made of 9 Copper tubes, but for best performance there are only 7 in use. PSU: 4 MOTs unballasted, powerdraw is about 15A by 230V Longest spark was 1,2meter
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Reaching Oct 16 2005
something small i build at the weekend.
Mini SSTC 2
The Mini SSTC 2 is a slightly improved version of my mini sstc1.
Secondary:11x22cm wound with 0,2mm , coated with alkyd (like epoxyd) Primary: 8 Turns 6mm² 12 cm inner Diameter Frequency: ca 220kHz Bridge: Halfbridge of Irfp460´s Driver: Simple 555 driver with adj, cap Discharges: up to 25cm
i tried a round design and i think it looks fine. after the Weekend i want to build some fine chicken wire around it.
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