Network power supply for the player. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Network power supply for the player. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power Supplies

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Nowadays, many have players of various companies. All of them are powered by "finger" type batteries. These batteries have a small capacity and quickly "sit down" during the operation of the player. Therefore, in stationary conditions it is better to power the players from the mains through the power supply, since the price of batteries in our time "bites".

The radio technical literature contains descriptions of various power supplies for radio devices, including players with a 3-volt supply. The block described below provides an output voltage of 3 V at a load current of up to 400 mA, which is quite enough to power any player or radio. For this power supply, a transformer and a housing from the power supply of a microcalculator of the MK-62 type ("Electronics D2-10m") are used. The primary (network) winding is left at the transformer, and the secondary is rewound. Now it contains 270 turns of PEL or PEV 0,23 wire.

AC adapter for the player

And one more feature of this power supply. The Japanese transistor D837B is used as the output transistor. All our transistors do not provide the necessary stabilization of the 3 V output voltage when the current consumption changes from 50-70 mA (radio mode) to 35-400 mA (tape recorder mode). Otherwise, the voltage regulator circuit is of the classical compensation type.

The output transistor must be placed on a small heatsink. The power supply unit is mounted in a hinged way.

Author: O.G.Rashitov, Kiev

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