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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
I tried putting a homemade HV transformer into my mini SGTC, but with no success. First - do SGTCs require DC or AC to work, or does it just depend on the frequency? If I need to rectify the output should I use full or half wave rectification? The mini HV transformer is made from an ATX core, gives good arcs and strikes from about 7kV. The gap in the Tesla coil is set for about 1-2kV. I'm running the transformer just like I ran an original flyback which worked in the SGTC, - flyback mode at about 30-40kHz.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Most SGTCs work on a sinusoidal ac charging voltage - 50/60 Hz line. (NST, OBIT, MOT-stack, pole-pig etc.) Usually each half-cycle charges the primary capacitor which is then discharged by the spark gap and primary inductor BEFORE the next half-cycle begins. Sometimes there are multiple charge/discharge cycles within one half-cycle of the mains. Anyway, this is why the common spark-rate is 100 or 120 sparks/arcs per second.
Your ATX-transformer flyback is like the 'Induction Coil' SGTCs of earlier days, a few choices;
1) A rectifier directly connected to the primary capacitor for about 7 kV charging voltage 2) A rectifier into a relatively large 'reservoir' capacitor, then 'resonant-charging' (inductor + Diode) for about 14 kV charging voltage. 3) A Cockroft-Walton (Greinacher) voltage multiplier for 7 or 14 kV charging voltage. (one or two stages)
Since you are operating the ATX transformer in flyback mode (in my opinion the best/simplest choice) all you need is (as above) a single high voltage rectifier!
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SGTC doesn't work with homemade transformer
