Receiver circuit diagram for remote control toys

Single chip microcomputer STM32L151CCU6

Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ) 7.5PF 10PPM 20PPM 30PPM

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

The high-frequency signal emitted at the transmitting end is received by the receiving antenna, and the super-regenerative receiving circuit composed of Q1, L2, C2, C3, etc., L2 and C2 are parallel resonant circuits, the function of which is frequency selective, and C3 is super-regenerative positive feedback capacitor. Adjust L2 to change the receiving frequency. R1, R2, and C5 determine the extinguishing voltage of the super regeneration. The received signal is sent to the {14} pin of the decoding circuit RX-2 via R4 and C7 for amplification. The amplified signal is output from the {1} pin and sent to the decoding signal output terminal {3} through R8 for decoding. When the decoding circuit decodes the received signal, if it is the forward signal, the {11} pin outputs a high level, Q11 turns on → Q12, Q13 respectively turn on, +4.5V, etc. via Q12→MA→MB→Q13 → Ground, the motor is turning forward, the car is moving forward, other functions are like this, and will not be described again. R9 is an oscillating resistor. The {6}, {7}, {10}, {11}, and {12} feet in RX-2 are the outputs of functions such as right turn, left turn, backward, forward, and acceleration. R20, D1, C1, and C14 form a simple voltage regulator circuit that provides a stable operating voltage for the RX-2 and an isolated diode for the D2.