The auto switch of the TV sound emitter

Published:2011/7/10 8:54:00 Author:Seven | Keyword: auto switch, sound emitter | From:SeekIC

See as the figure, the main circuit is an ordinary single chip FM stereo broadcast emitter integrated circuit BA1404, whose circuit is well known. Both L1 and L2 are covered by the enameled wire of 0.3mm, 5 turns in total. The internal diameter is 3mm, the length is 8mm. With the coil winded according the data, the frequency is 10MHz. In the received range of ordinary radios. The auto part is in the left-upper part of the figure, whose principle is that after the TV set is turned on, there generates a strong magnetic field which is produced by the line scanning system of the tube in the TV set.



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