he circuit shown here is of simple radio transmitter which is used to transmit voice signal up to 20M and is listen in radio resistor. The complete circuit is built around a single transistor followed by micro-phone for and a MW antenna for any old radio. If the sound is not clear at the receiver, then adjust ferrite core of MW coil and fixed it where clear sound is listen.
PARTS LIST OF SIMPLE RADIO TRANSMITTER
|Resistors (all ¼-watt, ± 5% Carbon)|
|R1 = 10 KΩ
R2 = 47 KΩ
|C1 = 10 µF/16V|
C2 = 0.01 µF
C3 = 470 pF