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Hybrid Linear Power Amplifier



Section Civil radio communications. In shortwave transceivers, the transmission path usually contains a powerful final amplifier based on an electric vacuum tube and a preamplifier based on transistors. At the same time, resonant circuits are used to match the pre-amplifier with the final amplifier. Similar circuits are also included between the pre-amplifier and the last mixer of the transmitting path. Such a construction of the transmitting path of the transceiver cannot be considered optimal. The use of two switchable resonant circuits at the input and output of the preamplifier complicates the device. In addition, the inclusion of the collector of a powerful transistor in the circuit of the resonant circuit can lead to the appearance of nonlinear distortions due to the large nonlinearity of the capacitance of the collector junction of the transistor. ... >>

Device for automatic recharging of batteries in the emergency power system



Section Chargers, batteries, galvanic cells. The emergency lighting power source at many facilities is 12 V batteries. However, during operation, they are discharged, and the illumination decreases. The proposed device for automatic recharging of batteries in the emergency power system during operation is shown in Fig. 1 ... >>

Economical house-street thermometer with cell phone indicator



Section Power regulators, thermometers, heat stabilizers. The initial reason for this development was the desire to have a self-contained, small-sized device capable of long battery life. The first problem was the choice of an indicator to display the measured temperature values. The LED indicators did not fit due to the significant current consumption. A conventional multi-digit seven-element LCD draws much less current, but it has too many control signals, which requires the use of a multi-pin microcontroller. An LCD with an integrated controller, controlled by only a few signals, was the best. After a long search, I settled on a LCD from a cell phone. It incorporates an SPI-controlled LPH7779 or PCD8544 controller, the control protocol of which is known ... >>

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