Transmitter/Receiver

Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan’s beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM radio over a remarkable distance. I’ve seen lots of designs through the years, some of them were so simple, some of them [...]

Parts List R1,R4,R6 = 10K, C1,C2 = 0.1uF, Q1,Q2 = 2N3904 R2 = 1M, C3 = 0.01uF, L1 = 0.1uH R3 = 100K, C4 = 4-40pF R5 = 100 ohm, C5 = 4.7pF R7 = 1K http://www.uoguelph.ca/~antoon/circ/fmt1.htm

Here is a small project about FM receiver that you can built with a little cost. The dificult point is to get the inductor coil, i think there a no electronic store that sell this coil.

The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. Coil details follow: L1 4 turns of 18swg air spaced with a 1cm diameter, the tap is one turn up from earth end…