Radio amateur designer. Schemes, articles of the Free Technical Library

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Radio amateur designer. Schemes, articles, descriptions

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Radio amateur designer

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A simple voltage regulator for a car

Section Car. Electronic devices. Most of the described amateur voltage regulators for a car, as well as industrial regulators that are equipped with mass-produced cars, are designed to maintain an unchanging stable voltage at the generator terminals. When the load increases (headlights, fan and other consumers are turned on), the voltage drop on the wires increases, and the voltage of the on-board network decreases accordingly, and the battery charging current also decreases. ... >>

Voltage converter, 12/220 volts 100 watts

Section Voltage converters, rectifiers, inverters. On fig. 4.34 shows a diagram of a voltage converter 12 V DC to 220 V AC. The proposed version of the converter can be used to power the radio, television receiver and other electronic devices with a power of up to 100 watts. The converter consists of a master oscillator made according to the scheme of a symmetrical multivibrator based on transistors VT1, VT2 and a power amplifier based on transistors VT3...VT8. It works like this. When power is supplied by the SA1 switch, the multivibrator starts generating symmetrical pulses (meander). From the collectors of the multivibrator transistors, the pulses through the chains R5, C3 and R6, C4 are fed to the transistors of the push-pull power amplifier ... >>

Powering the PWM controller chip and gate drivers with stabilized voltage

Section Voltage stabilizers. In many practical designs of automotive PVs, the PWM controller chip (for example, TL494, SG3524, etc.) is powered directly from the REMOTE input (see the descriptions of the PV amplifiers MTX and Jensen) through a directly connected protective diode. In the presence of an external gate driver (inverter, repeater), the current consumption from the REMOTE bus does not exceed 20 mA and thus fits into the capabilities of any head unit. When the controller IC operates directly on the gates of the MIS keys, its average current consumption increases to 50-80 mA (the thermal limit for an IC in a DIP16 package is 1 W at 45C). Which is also unlikely to overload the REM signal source. Then why invent a separate stabilizer or switch to power the controller IC ... >>

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Articles for a radio amateur designer

Articles for a radio amateur designer; diagrams for a radio amateur designer; descriptions for a radio amateur designer: 220 articles

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