2.1 amplifier circuit diagram:

This is the 2.1 amplifier circuit diagram for the home theater. This circuit has 3 audio inputs and 3 audio outputs. 2 outputs for the surround another output for the bass speaker. The surround output is 10+10 watts, and the bass output is 20 watts. The voltage needs a minimum 12-0-12 voltage to 15-0-15 AC voltage.

Here in this circuit, 4558ic is used to make a low-pass filter. 2.0 audio input is needed for this circuit board. Here also we can also get the 5V for the Bluetooth audio device. here used a 7805 IC is used to make 5 voltage.

Mini amplifier circuit using LA78040

Mini amplifier circuit using LA78040:

This is a Mini amplifier circuit using LA78040. It’s a stereo audio board. We can use a maximum AC24 voltage. This circuit can make 9+9 watts of output. It’s a mini circuit board. We can also use a DC 24 volts.

This is the Speaker protection circuit diagram. It can protect our Speaker from the burn. If the amplifier has any problems, this circuit can save our soundbox. Normally, when the transistor makes a short circuit, the voltage comes out from the speaker output line, and this circuit protects that voltage. This circuit should not allow direct voltage to be sent to the speaker. This circuit is essential for protecting the speaker.

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Transistor circuit for an amplifier

Build a Transformer or construct the transformer. Home Theater Circuit Diagram 5.1

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