Manufacturing circuit diagram of radio remote control transmitter and receiver

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 (T630/T631). Circuit introduction: The radio remote control transmitter T630 is a micro transmitter with built-in open wire and no signal. Its transmission frequency is 265MHz. When powered by 12V power supply, the remote control distance is 100M, the working current is only 4mA, and its volume is 28X12X10mm. The radio receiver T631 is a built-in antenna, a receiver and demodulator like a TV tuner. Its typical operating voltage is 6V, the waiting operating current is 1mA, the receiving frequency is 265MHz, and its size is only 31X23X10mm. 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 T630 is shown in the figure. The circuit four transmitter V1 and peripheral components C1, C2, L1, L2, etc. form an ultra-high frequency transmitting circuit with a frequency of 265MHz, 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 size of 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. The following are two transceiver devices using acoustic surfaces. Compared with the circuits introduced previously, they have longer transmission distances, stronger anti-interference capabilities, and are easier to make and debug. The prices are for the transmitting part: the receiving part: