Friday, October 2, 2009
mini audio amplifier using IC LM 386.This amplifier is much suitable for small game amplifying applications .The circuit has few components and works of a 12 Volt power supply.You can increase the supply voltage up to 18V for a bit more power, with out changing the components.But I would say 12V is OK. A 4 Ohm speaker can be used as load.Volume can be controlled by connecting a 10k pot at the audio input to the IC.
Skema rangkaian audio amplifier using IC LM 386
Component List:
C1 1 10uf Electrolytic Capacitor
C2 1 470uf Electrolytic Capacitor
C3 1 0.1uF Disc Capacitor
C4 1 2000uf Electrolytic Capacitor 2200uF
R1 1 2.2 Ohm Resistance (Anything Within 10% tolerance)
R3 1 220 Ohm Resistance (Anything Within 10% tolerance)
IC1 1 LM383 IC
IC LM386 Description
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.
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.
IC LM386 Features
• Minimum external parts
• Wide supply voltage range: 4V-12V or 5V-18V
• Low quiescent current drain: 4mA
• Voltage gains from 20 to 200
• Ground referenced input
• Self-centering output quiescent voltage
• Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8Ohm, PO = 125mW, f = 1kHz)
• Available in 8 pin MSOP package.
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