Increasing the output power of the car radio. Scheme, description

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Increasing the output power of the car radio. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automotive power amplifiers

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Sometimes it happens that a car radio purchased at one time ceases to meet the increased requirements of the owner. Some do it simply: buy a new one. Meanwhile, it is often possible to improve the old one. I want to acquaint readers with the experience of replacing a two-channel UMZCH car radio with a more powerful four-channel one.

My car radio "Toshiba TX-20" has a two-channel UMZCH TDA7394. Its maximum output power is 15W per channel. It is clear that the sinusoidal power of this amplifier is much less, therefore, even at medium volume, nonlinear distortions are noticeable. Over time, there was a desire to power up the radio, and at the same time make it four-channel.

To do this, I decided to replace the TDA7394 chip in the radio with the TDA7384A chip, which provides a maximum power of 40 W in each of the four channels. Similar characteristics have most modern car radios. With a power of 4 W per channel, the harmonic coefficient does not exceed 0,15%, which is quite enough for a not very demanding listener. More details about the characteristics of this microcircuit can be found in the article "AF Power Amplifier TDA7384A", published in this issue of the magazine.

The circuit for connecting the microcircuit is shown in the figure. The numbers next to the black dots correspond to the pins of the previously installed TDA7394 chip. First, the old UMZCH chip is dismantled from the radio board. A new microcircuit can be attached to the back wall using heat-conducting paste, and the connections can be made with MGTF wire. Similarly, this chip can be installed in other car radios.

Increasing the output power of the car radio

The balance between the left and right channels is adjusted in the usual way from the front panel of the radio. If desired, you can adjust the balance between the front and rear speakers.

During the operation of the radio with the old microcircuit and experiments with the new one, it turned out that the sound of high frequencies left much to be desired. The reason for this shortcoming, as it turned out, was 2200 pF capacitors shunting the UMZCH inputs. By removing them, it was possible to increase the level of high frequencies, which made the sound of the car radio more juicy and pleasant.

Author: O. Dolgov, Moscow

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