Mini Radio

A radio is a receiver for radio broadcasting. The weak signal is modulated by the high-frequency input from the receiving antenna, restoring the audio signal after amplification, frequency conversion, and detection. Radios can be combined with different components and wiring methods according to different needs. Early radios used tubes, but now transistors and integrated circuits are common. A regenerative radio with a simple line uses only one transistor, while a superheterodyne FM radio with a complex line often uses a variety of integrated circuits. Mini radios are smaller and easier to carry than regular radios. There are many mini radios for sale on Alibaba.com, including retro mini radios, which are nostalgia-inducing ones with vintage designs.

The receiving principle of mini radio

The mini radio restores the high-frequency signal received from the antenna into an audio signal by mini radio am fm and sends it to the headset or speaker to become a sound wave. Because of the progress of science and technology, there are many different frequencies of radio waves in the sky; if the many waves are all received, the audio signal will be like being in a busy market. In order to try to choose the required program, including after receiving the antenna, there is a selective circuit; its role is to pick out the required signal or station and filter out the unwanted signal to avoid interference, which is the "select station" button used when we listen to the broadcast. Also called Am fm mini radio. The output of the selective circuit is to select a radio station's high-frequency amplitude modulation signal; using it to promote the headset or electrophotography directly is not possible, but it also must restore it to the original audio signal; this reduction circuit is called demodulation. The demodulated audio signal on the headset can receive the broadcast. Furthermore, the Bluetooth mini radio is an extra choice too, which can connect with the device and be paired to play songs of its own choice after opening the player..

Mini radio maintenance

The maintenance of the AC radio should pay attention to the following: the summer use time should not be too long to prevent the power transformer from overheating and burning out; Take care to ventilate the vent hole behind the radio. It is best to turn on the radio every day so that the various electronic tubes and transformers of the radio emit heat to remove moisture, which can prevent mold damage to parts, and to put four sanitary balls wrapped in paper at the bottom of the radio to prevent moth infestation of the radio board box, such as the plastic shell, which cannot be packed.

The maintenance of the semiconductor radio should pay attention to what is used often to prevent mildew and part failure. When not used, people should remove the battery to prevent radio leakage. People should replace the battery in time because the battery is running out. Internal resistance increases because, although it can be listened to, the sound is dull, it is not pleasant, and it will leak.

Ac, semiconductor radio should be shockproof and heatproof, such as the installation of antennas to take lightning protection measures, that is, between the antenna and the radio installed; an isolation switch when not in use or on thunderstorm days should be disconnected from the antenna and the radio; people should ground the antenna, that is, access to water pipes or deep underground iron, copper, etc. The radio's volume should be manageable; too much will sometimes break the horn. Pay attention to anti-ash; dust may enter the machine through the smallmouth on the radio speaker, affecting the sound effect.