NCP2824 bassed Class D amplifier electronic project Diagram Circuit

Using the NCP2824 filterless Class D amplifier can be designed a very simple low power audio amplifier electronic project, capable of delivering up to 2.4 W to a 4 ohms load with a 5 V supply voltage.
With the same battery voltage, it can deliver 1.2 W to an 8 ohms load with less than 1% THD+N. The non−clipping function automatically adjusts the output voltage in order to control the distortion when an excessive input is applied to the amplifier.

This adjustment is done thanks to an Automatic Gain Control circuitry (AGC) built into the chip. A simple single wire interface allows to the non Clipping function to be enabled and disabled.
A programmable power limit function is also embedded in order to protect speakers from damage caused by an excessive sound level.

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Class AB Power Amplifier Circuit 30w Using Power Transistor

Class AB Power Amplifier Circuit Diagram

30W Class AB power amplifier schema diagram using power transistor. Set the above amplifier up by adjust the variable resistor R1 to maximum and R12 to zero. After this set up is done, the activate / turn on the amplifier. Adjust the R1 so that the measured output offset is between 30 and 100mV. Once set, adjust the R12 slowly to achieve a quiescent current of around 120mA. Keep checking the quiescent current as the amplifier heats up as it might change due to voltage drop changes in the output devices because of the heat. The heatsinks should be 0.6K/W or less for two amplifiers.

Power supply schema for 30W class AB power amplifier:

30W Class AB Power Amplifier Circuit, 

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