Frequency Stable Simple FM Emitting Circuit ----- FM Transmitter

Frequent FM transmit circuit, FM Transmitter Keywords: frequency stable simple frequency modulation circuit The working voltage of this circuit is 9V, the operating current is 2 ~ 6mA, the element parameters are as shown in the figure, BG1 is 9018, BG2 is C1959 (may also be 9018, but the power is small, if it is D-40 to expand the angle to 1000 meters ), L1, L2 is 0.5 mm of enamel lines around 4 and 3 laps, and the operating voltage can be increased to 12V, which can increase the distance, but the frequency can be changed, and the entire circuit is preferably powered by battery. To achieve the best results of sound quality and running, turn off the work of BG2 when debugging, adjust the frequency you need, and finally open the BG2 circuit adjustment power. The authors of this circuit use BG1-D40, BG2 - C1970 effect, voltage 12V, BG1 operating voltage 6V, and distance is 3000 meters (directional experiment). If you want to use D-40, please note that the working voltage of D-40 is 6V! It is best to put this circuit in a iron box, and the input is added to a decrease network. wish you success!

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