How to Design a FM Transmitter

Date:2014/8/1 11:44:19 Hits:

Building your own FM transmitter will allow you to tune in to your favorite radio stations anywhere you are. You can also hook an FM transmitter into a portable audio or video device and broadcast sound to an FM radio receiver.

Instructions

1.Cut out a rectangular piece from one single-sided copper board about the size of a postcard - called the "postcard". Cut out five smaller squares from another piece of single-sided copper board that are one-half-inch squares each. They are called "stamps".

2.Glue four stamps in a row along the length of the card, with the copper side facing you, in the middle of the postcard with a 1/2-inch space between each. Glue the last stamp 1/2-inch above the second stamp. This stamp pattern shown below will look like an inverted "T".

3.Solder the red wire of the nine-volt battery connector to stamp five. Solder the black wire to the postcard to the right and above stamp five.

4.Cut the audio cable about six inches from the jack with wire cutters. Keep this piece.

5.Strip the end of the cable where you made the cut with the electronics pliers so you can see the red and white wires. 1/2-inch of the copper should be exposed on each wire.

6.Solder the red wire to stamp one and the white wire to postcard close to the lower left corner.

7.Solder one end of the 470-Ohm resistor to stamp four and the other end to the postcard below stamp four. Tweezers may help form here on out.

8.Solder one end of the 27,000-Ohm resistor to stamp five. (The red end of the battery snap connector is already soldered here.) Solder the other end of the resistor to stamp two.

9.Solder one end of your 10,000-Ohm resistor to stamp two and the other end to the postcard below stamp two.

10.Solder one end of the 10PF Ceramic capacitor to stamp three and the other end to stamp four.

11.Solder one end of the 0.01MF (also indicated as 103) Ceramic capacitor to stamp five and the other end to the postcard to the left of stamp five.

12.Solder one end of the second 0.01MF (also indicated as 103) Ceramic capacitor to stamp two and the other end to the postcard to the right and below stamp two.

13.Solder one end of the 10 - 20 PF trimmer capacitor to stamp three and the other end to the postcard.

14.Solder the negative end of the 1 - 33 MF capacitor to stamp one and the positive end to stamp two.

15.Solder the B wire of the 2SC2001 transistor to stamp two, the C wire to stamp three and the E wire to stamp four.

16.Make a coil by wrapping four turns of .8 mm (20 gauge) copper wire around a pencil. Solder one end to stamp three and the other end to stamp four.

17.Plug the nine-volt battery in. Plug a device in on the audio end. You should be able to transmit and pick this up on an FM radio receiver. Turn the trimcap slowly to find the strongest signal.

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Next:DAB Digital Radio Tutorial

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