Keywords: Tesla magnifying transmitter circuit.svg magnifying transmitter a Tesla coil circuit invented by Serbian-American engineer Nikola Tesla in the 1890s It differs from ordinary two-coil Tesla coil circuits in that Tesla has added a third coil L3 attached to the high voltage end of the secondary L2 which is not magnetically coupled to the other two coils This acts as a tuned circuit resonating with its own parasitic capacitance C2 to generate higher voltage Tesla used this design 1899-1900 in the huge magnifying transmitter at his Colorado Springs laboratory one of the largest Tesla coils ever built With an input power of 150 kW it could produce potentials in the neighborhood of 12 million volts at a frequency around 150 kHz creating 140 ft bolts of lightning Circuit from http //books google com/books id NBLEAA6QKYkC pg PA279 Sarkar Mailloux Oliner Salazar-Palma Sengupta 2006 History of Wireless John Wiley and Sons p 279 fig 8 on Google Books 2015-04-27 own Chetvorno other versions cc-zero Uploaded with UploadWizard Tesla coil circuits |