construct FM Transmitter

FM Transmitter

Schematic

PC Board Layout and Parts Placement

Parts

   

Notes

1.    L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about  4mm. The inside of a ballpoint pen works well (the plastic tube that holds the ink). Remove the form after  winding then install the coil on the circuit board, being careful not to bend it.
2.    C5 is used for tuning. This transmitter operates on the normal broadcast frequencies (88-108MHz).
3.    Q1 and Q2 can also be 2N3904 or something similar.
4.    You can use 1/4 W resistors mounted vertically instead of 1/8 W resistors.
5.    You may want to bypass the battery with a .01uf capacitor.
6.    An antenna may not be required for operation.