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.
- Battery operation
- 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 = 8W, PO =
I built this circuit for my desktop computer along with a simple LED VU meter.It is a simple circuit of optical index of
level of sound signals, adapted in various needs of user. The each led turns on
when the level is altered at 0.65V roughly. The requirements in current are 80
ma with complete index. We can add all units LED we want, always calculating the
current where they will need the news LED.