Remote control light wireless transmitter circuit diagram

In the figure, V1, C3, C1, L1, and L2 form a 100MHz high-frequency oscillator. Adjusting C4 can adjust the oscillation frequency. Generally, C4 uses a fine-tuning capacitor with an adjustment range of 3 to 18pF.

The antenna is a printed antenna made on a printed circuit board. 100MHz radio waves are emitted by this antenna. The encoded signal of QCH417 is output from DOUT and sent to the base modulated radio wave emission of V1 through R6.

SB1~SB8 are remote control keys. Press any one of them, and the three output terminals of SR830 will output a set of codes. At the same time, Vdd will change to 12V, Vcc will change to 5V, and QCH417 will start to work and transmit the code. The three-digit code generated by SR830 is sent to the A9 to A11 terminals of QCH417 and is also used as coding information, so that the transmission code of each button is different, that is, each button can only control one control object.
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