The operating frequency range of the CD4046 is from 0 to 1 MHz, and the phase-locked loop can be well adapted in this frequency range. When the phase-locked loop circuit is used for frequency selection, its frequency selection frequency is mainly determined by the external capacitor value between pins 6 and 7 and the external resistor value of 11 pins. As long as the parameters of these components are selected, the phase-locked loop is selected. The center frequency of the voltage controlled oscillator is determined, and the frequency selection frequency of the phase locked loop is also determined. With this feature of the phase-locked loop, it can be applied to the channel selection circuit of the remote control receiver. For example, when we use it for the channel selection circuit of the dual-channel remote control receiver, we only need to select the external capacitance value corresponding to the center frequency between the 6th and 7th legs according to the center frequency of the selected channel. The composition of this circuit is shown in the figure.
(a) is a remote control transmitting circuit; (b) is a receiving circuit.
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