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The Mini SSTC The Mini SSTC Page Created: 1/15/04 Updated 4/30/07 I built this small coil in about 1 day of work. Its small and relatively safe. It produces up to 7' of spark, though this is limited to my small heatsinks getting too warm. If one was to copy the design but use larger heatsinks, the power could be much greater. Please scroll down to the end of the page to see the finalized schematic! Here are some pictures of the original setup. It worked well but needed a really long antenna to work properly.

See the updates for the slightly revised version. Schematic (not final, see end of page) Update 1/18/04 I removed 2 primary turns for a total of just 4 turns. This surprisingly helped with heating problems of the MOSFETs!

I also removed the toroid and now just have a wire pointing off the edge of the coil. The coil runs much happier now. The heatsinks have yet to get overheated. Also, these changes brought about 7' sparks (compared with 6' previously).

Here are some snapshots of the new setup and the various sparks this little coil can create. Here the coil is operating with a moderate pulse width and rate.

Here the coil is running at a low pulse rate and a low duty cycle. Now the pulse rate is maxed but still a low on time. Low pulse rate, but now the duty cycle is a bit higher, notice the thickness. The highest duty cycle at a low pulse rate produces flame like discharges that do burn things easily. How the coil works Here is an overview of the schematic and how the coil operates.

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In the top of the schematic we see the low voltage power supply section composed of a small transformer, 4 diodes, some caps and voltage regulators. The 7812 gives 12V at about 1A. This regulator should be heatsinked as it supplies the power to the demanding gate driver section. The 7805 supplies 5V for the logic ICs.

Contoh undangan syukuran pernikahan format word. U1 is any typical 555 running at about 200khz or so (this is not critical as long as it is running relatively fast, or about 1/2 the frequency you intend the coil to run at). Its sole purpose is to trigger the oscillation. There is a 100K resistor on its output that makes the 555 look 'weak' to the input of the 74hc14. In fact, its *just* strong enough to trigger the 74hc14 (which is a hex inverter). Now, also on the input of the 74hc14 we see an antenna with a series capacitor.