2.1 circuit diagram using TDA8947J

Electronics Help Care May 14, 2025 Amplifier Diagram

2.1 Circuit diagram using TDA8947J:

This is the 2.1 circuit diagram using TDA8947J. This amplifier circuit has 3 audio inputs and 3 audio outputs. One can make 50 watts, and the other 2 are 25+25 watts. We can make one subwoofer and two surrounds. But we must use a low-pass filter circuit board to make a subwoofer. The surround input will be direct, and the subwoofer input will be using this lowpass filter. This circuit runs with 9 volts to 26 volts.

STK amplifier circuit:

This STK amplifier circuit uses the STK 022 IC, which can make 15 watts. We can convert AC 12-0-12 voltage to AC 18-0-18 voltage, and we can use DC 25-0-25 voltage at the maximum. Here, use dual Ic to make a stereo amplifier. 15Watts + 15watts.

The low-pass filter for the subwoofer

This is the low-pass filter for the subwoofer amplifier. This circuit needs to make a bass amplifier. We also need to make a 2.1,5.1 audio sound system. This board makes only bass. makes only the low part. It has no mid-range or high part. It’s also a pre-amplifier. It’s output mono. Input stereo but output mono. This board runs on 9 volts to 15 volts. It needs a single voltage. For this, we can use this board in a car amplifier.

low pass filter for subwoofer amplifier

This is an amplifier circuit diagram using transistors. Here, the C5198 and A1941 transistors are used. We can also use other transistors. any pair of NPN and PNP. like 2sc5200 and 2sa1943. It’s a mono audio circuit diagram board. This circuit can deliver up to 400 watts. It depends on the voltage and amperes. If we use 35-0-35 voltage and 5 amperes. Then we get the output 35X5=175 watts. or 50-0-50 volts and 5 amperes. Then the output will be 50X5=250 watts.