This article introduces a direct-release AM radio made of YS764 integrated circuit and a small number of components. YS764 can be widely used in the production of ultra-thin gift radios such as card radios and lighter radios, with very promising economic value. The shape of the YS764 integrated circuit is like a 9014 low-power transistor, and its three pins are 2 feet (input end), 3 feet (output end) and 1 pin (common ground). The attached table is the main parameters of YS764 integrated circuit. Circuit working principle Figure 1 is a block diagram of the circuit principle of the YS764 radio. The radio uses a magnetic antenna TA as a receiving antenna. It can receive the electromagnetic wave signal propagated in space and convert it into a high-frequency electrical signal to receive. The input tuning loop consists of coil L1 and variable capacitor C1. The tuning loop can select the signal of a certain radio station from many carrier signals and play the role of selecting the radio station. The high-frequency amplifier amplifies the received weak signal in multiple stages before sending it to the detector. Because the frequency of the received high-frequency amplitude modulation signal is as high as several hundred kHz to several tens of MHz. Such a high alternating current cannot make headphones or speakers produce sound, so the audio signal in the high-frequency signal must be taken out through the detector. Then, it passes through the audio amplifier composed of triode to fully amplify the detected audio signal, and finally converts the electrical signal into a sound signal through the earphone (speaker) to play. Typical application circuit Earphone radio YS764 can directly push a highly sensitive earphone. The equivalent impedance (RL) of the earphone should generally be in the range of 100 to 1500Ω (the RX can be properly connected in series to meet the requirements). Figure 2 shows the working circuit for highly sensitive headphones (plugs). Add a single-tube amplifier to the circuit in Figure 2 to use low-cost crystal headphones (see Figure 3). This is a working line of a head-mounted (or ear-hook) miniature radio that is more popular abroad. In Fig. 2 and Fig. 3, L1 and C1 form a tuning loop. Coil L1 can choose wire diameter? 0.1 ~ 0.3mm enameled wire, flat winding 80 ~ 130 turns on the magnetic bar of specifications such as? 5 × 23 (mm) or 50 × 12 × 4 (mm). Tuning capacitor C1 can buy a micro-variable capacitor that is smaller than the trimmer capacitor, and can also be replaced by a small sealed double-connected antenna. The battery adopts GB type button battery or No. 6 battery. Refer to the diagram for other component parameters. Superheterodyne radio Figure 4 is a circuit diagram of a superheterodyne radio. Using YS764 integrated circuit as the intermediate frequency amplifier of the radio can make the circuit structure simple and compact. The rest of the circuit is the same as the ordinary superheterodyne radio. Readers should pay attention to the following issues when using YS764 integrated circuit design to make printed circuit boards: 1 The output decoupling capacitor should be as close as possible to the output end and the ground point. 2 All contacts should be short and as close as possible to YS764. 3 The tuning capacitor C1 should be kept away from the contacts of the battery and headphones (speakers). 4 The moving lead of tuning capacitor C1 should be welded to the connection point of automatic gain control resistor R1 and bypass capacitor C2. The above measures are mainly to prevent parasitic coupling and reduce noise interference and human induction. The YS764 integrated circuit has a wide operating frequency range and high power gain, and can be applied to various circuit designs. Follow WeChat Download Audiophile APP Follow the audiophile class related suggestion '+ data.data.username +' '; dom + ='
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