NJM386

The NJM386 has the following features including Operating Voltage(4V-12V);Minimum External Components;Low Operating Current (3mA);Voltage Gain (20-200);Single Supply Operation;Self-centering of Output Offset Voltage.

The NJM386 is a power amplit7er 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 up to 200.The inputs are ground reference while the output is automatically biased to one half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the NJM386 ideal for battery operation.The input resistors hive much deviation in value generally, so that it is recommended not to use them as the constant of the circuit.  The countermesure to be recommended si to apply the resistor of higher in value, which is so higher to be able to ignore the input deviation in parallel application.By making connection of both input pins with low value resistors to GND, the output offset voltage is automatically set in the medium range value of the supply source. However, the DC Gain of NJM386 is approximately at 20 times in value, so that when keeping one side input pin open, and the other side to GND on DC condition. The voltage drop caused by input resistor X input bias current, that is, (input resistor X input bias current)X 2O times voltage is to be added to the output offset voltage, and that the medium range output voltage is to be sheared,which in the result, no distortion output oscillation range shill be decreased.

NJM386 is the way, originally that the pin which is to be used for adjusting the gain of NLM386, but to have NJM386 applied in connecting to GND side, and by doing so, to stop the earely stage motion, but keeping on for muting operation.The Barely stage motion shall be stopped, therefore, the precise muting shall be proceeded with less leakage on operation.