Published:2009/7/10 0:28:00 Author:May | From:SeekIC
The Tesla coil described here can generate 25,000 V. So, even though the output current is low, be very careful! The main component is a flyback transformer from a discarded TV.A new primary winding is needed. Begin by winding 5 turns of #18 wire on the core. Then, twist a loop in the wire, and finish 'ay winding five more turns. Wrap with electrical tape, but leave the loop exposed.A four-turn winding must be wound over the ten-turn winding that you've just finished. That is done the same way. First wind two turns of # 18 wire, then make a loop, and finish by winding two more turns.Again, wrap the new winding with electrical tape, leaving the loop exposed.When the windings are finished, the two loops shouldn't be more than 1/4-inch apart, but take care that they do not touch. Connect a 240-Ω resistor between the two loops. The modified transformer now should look like the one shown. Connect the transformer as shown. The 27-Ω resistor and two transistors should be mounted on a heatsH and must be insulated from it.The output of the high-voltage winding should begin to oscillate as soon as the circuit is connected to a 12-Vdc power supply. If it does not, reverse the connections to the base leads of the transistors. In normal operation, you should be able to draw 1-inch sparks from the high-voltage lead using an insulated screw-driver.
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