Amplifier circuit diagram using TDA7370:
This is an amplifier circuit diagram using TDA7370. Here are 2 circuit boards. One is a 4-input and 4-output, and Another is a 2-input and 2-output. Normally, it’s for car audio. we can get 8+8+8+8 watts and 18+18 watts using 12 voltage.

Audio amplifier circuit using TDA2616:
audio amplifier circuit using TDA2616. This is a 12+12 watts audio amplifier circuit. It’s a dual power and dual output amplifier. We need positive, negative, and ground voltage. We can use a maximum of 16-0-16 voltage: 12 watts and 4 ohms output.
This is the Preamplifier circuit diagram for the amplifier. Every amplifier needs a bass tone control circuit. and also a pre-amplifier. This is a mono circuit. A stereo needs a dual circuit. This circuit runs with 12 volts. This circuit can control bass and tone. Here are 3 volumes. one for volume, one for the bass, and another one for the tone

How to add an extra transistor? A Maximum transistor amplifier can add extra transistors, but it will not work if we don’t increase the amperes or voltage. If we want to add an extra transistor, then we have to increase the voltage and amperage. like the voltage is 35-0-35 and 3 amperes for 2 transistors. If we add an extra 4 transistors, then we have to add an extra 4 amperes. And the voltage can be 45-0-45 maximum.
On our website, you can get many essential circuit diagrams. not only sound but also an inverter. voltage controller. transistor. STK circuit. Class-Dcircuit. The bass circuit/low-pass filter
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transistor circuit diagram of 2SA1943 and 2SC5200
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Electronics Help Care Amplifier circuit diagram