Power supply of low-voltage equipment in the car. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Power supply of low-voltage equipment in the car. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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Often, motorists and professionals use equipment in the car (usually radios and tape recorders) that are not designed to be powered from the on-board network. As a result, noise is heard in the loudspeakers caused by a running generator or ignition system. To eliminate the influence of interference, I propose the simplest power supply unit, consisting of an integrated stabilizer and an interference suppression filter (see diagram).

Power supply for low-voltage equipment in the car

Depending on the load parameters (nominal voltage and current consumption), an appropriate microcircuit and fuse are selected (for a current not exceeding the maximum value of the stabilizer and load). The diagram shows a stabilizer with an output voltage of 9 V (domestic analogue KR142EN8A). It can be used to power a load with a power of not more than 6 watts.

It is permissible to use oxide capacitors K50-35 or similar imported, non-polar ones - almost any, for example, K73-16, K73-17, MBM. Chokes are wound on ferrite rods with a diameter of 2,5 and a length of 25 mm with PEV-2 wire 0,3 turn to turn in one layer. The node is mounted on a fiberglass board with dimensions of 50x60 mm. Chokes are glued to the board with 88-HT glue or epoxy. Chip DA1 should be installed on a heat sink with an area of at least 15 cm2.

Author: A.Pavlov, Pirovskoye village, Krasnoyarsk Territory

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