NJM386B

The NJM386B is wider operating voltage and higher output power version of NJM386.The maximum operating voltage is 18V, and the maximum output power of NJM386B is up to 1 W.It is recommended to insert capacitors at around the supply source and the GND pins with the value of O.1F and more than 100F which are featuring higher frequency efficiency.When the speaker load condition, it is recommendable to insert the resisitor of 10 and the capacitor of 0.047F between the output and the GND pins.

Features of the NJM386B are:(1)operating voltage:(4V-18V); (2)minimum external components; (3)low operating current : (5mA); (4)voltage gain:(20-200); (5)single supply operation; (6)self-centering of output offset voltage; (7)package outline:DIP8, SIP8, DMP8; (8)bipolar technology.The input resistors have much deviation in value generally, so that it is recommended not to use them as the constant of the circuit. The countermeasure to be recommended is to apply the resistor of higher in value, which is so higher to be able to ignore the input deviation (3k approximately) in parallel application.

The absolute maximum ratings of the NJM386B can be summarized as:(1)supply voltage:22V;(2)storage temperature range:-40 to +125;(3)operating temperature range:-20 to 70 ;(4)power dissipation:DIP-8,700mW, SIP-9,800mW, DMP-8,300mW;(5)input voltage range:±0.4V.By making connection of both input pins with low value (below 1Ok approximately) 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 * input bias current, that is, (input resistor * input bias current)*20 times voltage is to be sheared, which in the result, no distortion output Oscillation range shall be decreeased.In regard to dealing with the input pin, it is recommendable to put the input pin into the GND at first, and the other side of signal input pin, to be connected into GND with the resisitor of less than about 10k on DC condition.