Sound booster pre-amplifier circuit diagram:
This is the Sound booster pre-amplifier circuit diagram. This board is for boosting the sound. This board works as a pre-amplifier. This circuit runs with 12-0-12 voltage to 15-0-15 voltage. Every amplifier needs this type of circuit. Normally, it’s included with the bass tone circuit. Sometimes we need more sound than we have to use this circuit.

It’s a stereo circuit. This board must be used before the audio input. The voltage should be dual: positive, negative, and ground. The audio will connect with the input, and the amplifier input will connect with the audio outputs.
Audio amplifier 2X300W using LM4702:
This is an audio amplifier 2X300W using an LM4702 IC. The IC is also used with two pairs of transistors to make 300+300-watt outputs. We can use 50-0-50 voltage to 85-0-85 voltage, depending on the IC. We can see the voltage listed in the diagram. Here also need transistors. PNP and NPN transistors are needed in this circuit diagram.
the diagram
2n3055 and 2n2955 transistor amplifier:
This is one of the best 2n3055 and 2n2955 transistor amplifier circuit diagrams. This is a 1000-watt circuit diagram. Here in this circuit, we can use 35-0-35 voltage to 70-0-70 voltage. If we use dual voltage, then it will be good. The driver circuit can use 35-0-35, and for the transistor, 70-0-70 voltage. like 70-35-0-35-70 voltage.

- Collector-Emitter Voltage (Vce): 60V max
- Collector Current (Ic): 15A max
- Power Dissipation: 115W

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