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Simple amplifier



This is the low frequency power amplifier of which the penumbra article can be composed without using it hardly.
The about 660-mW output can be gotten with the 16-ohm speaker.

This circuit is used for the simple monitor and so on.
The impedance (4-ohm and 8-ohm, and so on), the output power of the speaker and so on are specified by the standard but are OK rather than strict. Because the sound cracks (warping) when presenting the output above the rating, it uses naturally within the standard.
When conscious of the timbre and the output power, it is better not to do the use of this circuit.

The use example : TV sound monitor circuit of Frequency divider and so on.




Data for LM386
Operating voltage range: 4 to 12V(LM386NN)
5 to 18V(LM386N-4)
Current in the standing still:4mA(typ)
Package: 8 pins
Plastic DIL(code N)

The maximun rating (Ta=25C)
Vs:15V(LM386N)Tstg:-65 to +150C


22V(LM386N-4)
Tj:150C
PD*:660mW(LM386N)
Rth(j-a):187C/W(LM386N)


1.25W(LM386N-4)


100C/W(LM386n-4)
VIN:0.4V
Tpin:300C.10sec
Topt:0 to +70C
*
:Ta = 25C


The electric characteristic (Ta=25C)
SymbolMeasurement conditionMinTypMaxUnit
IQVS = 6V, VIN = 0V
48mA
IibVS = 6V, Term2,3 open
250
nA
GVVS = 6V, f = 1kHz
26
dB
It connects 10 F with the interval of the term 1-8.
46
POUT
VS=6V,RL=8ohm,THD=10%LM386N-1250325
mW
VS=9V,RL=16ohm,THD=10%LM386N-3500700
VS=16V,RL=32ohm,THD=10%LM386N-47001000
THD VS = 6V, RL = 8ohm, POUT = 125mW
f = 1kHz, Term1,8 open

0.2
%
RIN

50
k-ohm
SVR VS = 6V, f = 1kHz, CBYPASS = 10F
Term1,8 open

50
dB
BWVS = 6V, Term1,8 open
300
kHz


LM386 Low Voltage Audio Power Amplifier