Fm Trm

FM Transmitter Circuit This circuit is a simple twain transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless microph hotshots. If powered by a 9 volt battery and used with an antenna no overnight than 12 inches, the transmitter will be within the FCC limits. The microphone is amplified by Q1. Q2, C5, and L1 form an oscillator that operates in the 80 to 130 megacycle per second range. The oscillator is voltage controlled, so it is modulated by the audio request that is applied to the base of Q2. R6 limits the input to the RF section, and its value goat be adjusted as necessary to limit the saturation of the input. L1 and C6 can be made with wire and a draw. The induction (L1) is made by winding two pieces of 24 work out insulated wire, laid side by side, around a pencil six times. Remove the coil you puddle formed and loosen the two coils apart from each otherwise.

One of these coils (the better facial expression of the two) will be used in the tank circuit, and the other can be used in the next one you build. The antenna (24 grass wire) should be soldered to the coil you made, about 2 turns up from the bottom, on the transistor side, and should be 8-12 inches long. To make C6, irritate wind a 4 inch piece of 24 gauge insulated wire, b subvert it over double and, beginning 1/2 from the open end, twist the wire as if you were forming a rope. When you have about 1 of twisted wire, stop and cut the looped end off, leaving about 1/2 of twisted wire (this forms the capacitor) and 1/2 of untwisted wire for leads. If you want to get a full essay, order it on our website: Ordercustompaper.com

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