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The remote control circuit of the toy car

2017-01-15 20:02  
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The remote control circuit of the toy car
Figure 1 is the remote control circuit, when the control pin of this circuit is connected with the ground, the function which is corresponding to this pin will be in the selective passing state, and it is latched by the latch circuit, the latch signal controls the coding circuit to produce the coded signal that is corresponding to the control function. The carrier signal which is produced by the Q2 and XT is modulated by the coded signal and amplifierd by the Q1. R7 is the oscillation resistance of TX-2, LED is the power supply launch indicator light of the LED. Figure 2 is the receiving circuit, the high frequency signal which is output by the transmitter is received by the receiving antenna, the super-regenerative receiver circuit is composed of the Q1, L2, C2, C3, the parallel resonant circuit is composed of the L2 and C2, the function of the parallel resonant circuit is frequency selection, C3 is the super-regenerative positive feedback capacitor.