Wednesday, 3 August 2016

Make 1 Watt audio power amplifier using LM386

I needed an amplifier to listen music loudly from my phone. So I made this . It's easy to make and good fidelity sound.

About LM386

The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200. The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the LM386 ideal for battery operation


n Battery operation n Minimum external parts n Wide supply voltage range: 4V–12V or 5V–18V n Low quiescent current drain: 4mA n Voltage gains from 20 to 200 n Ground referenced input n Self-centering output quiescent voltage n Low distortion: 0.2% (AV = 20, VS = 6V, R L=8Ω,PO= 125mW, f = 1kHz) n Available in 8 pin MSOP package

Applications n AM-FM radio amplifiers n Portable tape player amplifiers n Intercoms n TV sound systems n Line drivers n Ultrasonic drivers n Small servo drivers n Power converters

Here is the circuit Diagram

Here is the Image Of My prototype

Note: For removing noise add a high value capacitor parallel to power supply.