Simple wireless remote control transmitter and receiver circuit diagram

Radio remote control is used in many fields due to its advantages such as long transmission distance, strong anti-interference ability, and non-directionality. However, due to complex electrical appliances, large transmission equipment, and difficulty in debugging, it has been restricted in the civilian field. With the development of electronic technology, these problems have been solved, giving it strong vitality.

Here I would like to introduce to you a method of making a radio remote control transmitter and receiver.

Circuit introduction

The radio remote control transmitter is a miniature transmitter with a transmission frequency of 315MHz. When powered by a 12V power supply, the remote control distance is 100M and the operating current is only 4mA. The radio receiver is a receiver and demodulator like a TV tuner. Its typical operating voltage is 6V, the waiting operating current is 2mA, and the receiving frequency is 315MHz. They can be used to easily produce various radio remote control devices, which have the advantages of miniaturization, long transmission distance, low power consumption, and strong anti-interference ability. It can easily replace infrared and ultrasonic transmitting and receiving heads.

The circuit principle of the radio transmitter is shown in the figure. Circuit four transmitter V1 and peripheral components C1, C2, L1, L2, etc. form a UHF transmitter circuit with a frequency of 315MHz, which is transmitted into the air through the loop antenna L2. Antenna L2 uses silver-plated wire or enameled wire with a diameter of 1.5mm, and the antenna size is 24mm (length) X9mm (height). Transistor V1 uses high-frequency transmitter tube BE414 or 2SC3355.

The circuit principle of the radio remote control receiver T631 is shown in the figure. The receiving circuit is mainly composed of V1, IC, etc. V1, C7, C9, L2 and other components form an ultra-high frequency receiving circuit. C9 is fine-tuned to change its receiving frequency so that it is strictly aligned with the 265MHz transmitting frequency. When antenna L2 receives the modulated wave, it is tuned by V1 to amplify the low-frequency component, which is then pre-amplified by V2 and sent to IC LM358. After further amplification and shaping, it is output by pin 7 of LM358. The actual size of the printed circuit board is 31mmX23CC . The size is 27mm (length)X9mm (height). OUT is the signal output terminal, and the transistor V1 is selected as BE415 or 2SC3355. Capacitor C9 can be a small adjustable capacitor. The IC uses LM358.

In order to reduce the volume in the transmitting and receiving circuits, all resistors use 1/8W or 1/16W metal film resistors; electrolytic capacitors also use ultra-small capacitors, and all other capacitors use high-frequency ceramic capacitors. When welding, the component pins should be cut as short as possible to make them close to the circuit board. The circuit board material should be a high-frequency circuit board.

launch part

receiving part