Single channel 13 channel radio remote control switch circuit

The single-channel radio remote control switch introduced in this example is composed of radio remote control transmitter/receiver and other related components. If the transmitter circuit is slightly modified, it can form a 3-channel radio remote control switch. The

working principle of

the single-channel radio remote control switch circuit is shown in the figure. In the transmitter circuit, press the transmitter button SA, and the multivibrator composed of transistors M, VT2 and other components oscillates to generate a 20kHz signal to modulate the TDC1808 transmitter component and then transmit it. In the receiving circuit, the demodulated signal received by the TDC 1809 receiving component is sent to the LM567 phase-locked loop integrated circuit for decoding. The 8th pin of the LM567 outputs a low level to trigger the bistable circuit composed of CD4013. Every time a signal is transmitted, the 8th pin of the LM567 outputs a low level, and the bistable circuit flips once, causing the relay to be attracted or released, thereby achieving the purpose of remote control switch.

The figure is a 3-channel radio remote control switch transmitter circuit. In the transmitting circuit, the TDC1808 multivibrator composed of VT1, VT2 and other components controls the operation of the transmitting component. If the multivibrator does not work, the TDC1808 will not work either. The resistors connected in series to the three buttons SA1 to SA3 have different resistance values, which can generate three different modulation signal frequencies. After being decoded by the receiving circuit, they can control the three channel switches respectively. The working principle of the receiving circuit is the same as that of the single-channel remote control switch receiving circuit.

Component selection

ICl uses the TDC1808 wireless remote control transmitting integrated circuit module; IC2 uses the TDC1809 wireless remote control receiving integrated circuit module; IC3 uses the LM567 audio phase-locked loop decoder integrated circuit; IC4 uses the CD4013 dual D flip-flop digital integrated circuit.

There are no special requirements for other components, and they can be selected according to the models and parameters marked in the figure.