Приветствую, уважаемые самоделкины! Пожалуй, каждый начинающий электронщик мечтает собрать себе личную мини-колонку. При этом она должна соответствовать набору требований: иметь простую конструкцию, недорогие компоненты, автономное питание. Вариантов таких конструкций может быть много, но в этой статье рассмотрим вариант на микросхеме TDA К её достоинствам можно отнести невысокую стоимость, достаточную для портативной колонки мощность и главное - максимально простую и понятную схему подключения. Схема представлена ниже.

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These circuits look very easy to assemble but require additional components like resistors, capacitors and sometime inductors. You also need to connect a 3W, ohm or 1W, 8-ohm speaker at the output of the circuit.

So when an audio signal is applied to the input, you can hear the amplified output from the speaker. Bridge-tied load working principle 2.

Supply voltage range of 3V to 18V 3. Gain of 40dB 4. No external components required 5. No switch-on or switch-off clicks 6. Good overall stability 7. Low power consumption Working on bridge-tied load principle , the circuit can output 1W power into an 8-ohm load with a power supply of 6V, and 3W power into a ohm load with a power supply of 12V.

Audio amplifier circuit and working Fig. It has two sections: power supply and amplifier. Melody generator chip UM66 IC3 is used to provide audio input to the amplifier. It requires around 3V input. So a voltage divider network using resistors R1 and R2 is used to derive 3V from 5V output of the power supply.

The output of IC3 is connected to the positive input of TDA through a ohm potmeter used for volume control. Vcc pin of IC4 is connected to 12V supply along with two capacitors as shown in Fig. The 3W, ohm loudspeaker is connected to output pins 6 and 8 of IC4. Place transformer X1 and speaker inside the box. When you switch on the mains power supply, UM66 chip gets activated and it generates a melody tone, which is fed to TDA through potmeter VR1.

TDA chip amplifies the melody sound to around 3W, which can be heard from the speaker. By varying VR1, you can adjust the volume of the output tone. Feel interested! Here are some circuit ideas.


3W Amplifier Circuit Battery Powered Stereo TDA7056AB



Мини-усилитель на TDA7056


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