Stereo Encoder Circuit made with discrete components ----- Stereo Encoder Circuit

Keywords: stereo encoder circuit made with discrete components Stereo encoder circuit made with discrete components Circuit Schemration Figures IC1-4069 Y1, Y2 constitute an oscillator with a frequency of 76 kHz, after the Y3-Y6 is isolated, the two sets of divided circuits composed of IC2 dual JK flip-flop CD4027, resulting in symmetrical +/- 38kHz And the square wave of 19kHz, where +/- 38kHz square wave is used to control the IC3 analog switch CD4066, and the input stereo audio signal is switched to the 19 kHz to mix the frequency signal to mix by the triode 9014 and sent into the FM modulator. . The FM modulator circuit can be found in the various frequency modulated circuits in this site. This article does not draw, the purpose is to make your enthusiasts can use this encoder, which can not only increase the stereo functions for your previous frequency modulation, but also as a universal equipment. Turn on the FM modulator and the five downtown, the IC1CD4069 each foot and IC2 CP, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, and respective, indicating that the oscillator has spurred. If there is a digital frequency meter, measure the IC1 output frequency, adjust the RW1 to 75kHz +/- 10 Hz. If there is no, you can first adjust the radio. After the RW2 is adjusted, then the RW1 is then toned, so that the radio stereo indicator is on, and there is no smash in the speaker. Then, feed the stereo audio signal from the input (1.5VPP, available amplifier output), which can receive stereo broadcast in the radio. The input signal can also be obtained from the line, but R7 should be changed accordingly. Finally, R7 can also be adjusted to minimize high frequency noise. In fact, R6, R7 is equivalent to external components in the 13, 14 feet in Ba1404, is a pilot signal and a composite signal hybrid circuit, and then input into the amplifier, in the circuit It is 9014, while the Ba1404 enters from 12 feet, I think this circuit also has many localities to be improved, interested in developing. Stereo encoder circuit

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