Wireless remote control transmitting head production ----- Wireless Remote Control Transceiver

Wireless remote transmitting receiver, Wireless Remote Control Transceiver Keywords: wireless transmit receiver, wireless transmit receiver The radio remote transmitler is a miniature transmitter with a transmit frequency of 315 MHz and a 12V power supply. The remote control distance is 100m, and the operating current is only 4mA. The radio receiver is a reception, demodulator, a typical operating voltage of 6V, a working current of 315 MHz. With them, it is convenient to make various radio remote control devices, which have miniaturized, transport distance, power consumption, and strong anti-interference ability. It is convenient to replace infrared, ultrasonic emission and receiving heads. The principle of radio range circuit is shown in the figure. The circuit four transmitting tubes V1 and the peripheral components C1, C2, L1, L2, and the like have a 315 MHz ultra-high frequency transmit circuit, and is transmitted to the air through the annular antenna L2. The antenna L2 uses a silver-plated line or a diameter of 1.5 mm, the antenna size is 24mm (long) x9mm (height). The triode V1 uses a high frequency transmit tube BE414 or 2SC3355. The principle of radio remote receiving head T631 circuit is shown. The receiving circuit is mainly composed of V1, IC, and the like, and the elements such as C7, C9, L2 constitute an ultra-high frequency receiving circuit, and the fine-tuning C9 changes its reception frequency, so that it is strictly aligned with a 265 MHz emission frequency. When the antenna L2 receives a modulated wave, the low frequency component is amplified by V1, and then the IC LM358 is sent after the V2 pre-enlargement, and after further enlargement, it is output from the 7th foot of the LM358. The actual size of the printed circuit board is 31mmx23cc, antenna The size is 27mm (long) X9mm (height). OUT is the signal output, and the triode V1 is selected with BE415 or 2SC3355. Capacitor C9 can be used for small adjustable capacitors. The IC is used to use LM358. In the transmitting and receiving circuit, the volume is reduced, all resistors are selected from 1 / 8W or 1 / 16W metal film resistance; the electrolytic capacitance is also ultra-small capacitance, and the other capacitors are all high-frequency ceramic capacitance. When the welding is taken as long as possible, the circuit board is adjusted to the circuit board, and the circuit board material should be used with a high frequency board. The following is a transmission and receiving device using a sound surface, which has a farther transmission distance, more resistant anti-interference ability, and more easy to make, debug, and prices relative to the previously described circuit. Receive part:

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