[Photo] Remote FM transmitter circuit made with LM389

LM389 includes an audio power amplifier circuit and three transistors with a frequency of up to 120M. Its internal circuits and pins are as follows:

The following picture is a remote wireless transmission circuit made with the integrated circuit of the United States. It is not difficult to see that in fact, it uses its sound amplification part as the audio amplification of the microphone, and then uses the audio signal output by pin 1 to modulate the post stage The high-frequency oscillation part of the high-frequency oscillation is completed by its internal high-frequency transistor. It cooperates with a good FM radio and can emit a distance of 1KM. The inductance in the circuit is wound with a 0.50mm diameter enameled wire into a 6mm diameter hollow coil with a center tap. Specifically, L1 and L3 are 6 turns and the center tap. L2 is 3 Turn, center tap. Its performance is more stable than the circuit made by the transistor. The following are the actual pictures and circuit schematics. Fans can make it by themselves.

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