Details

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BUY LM386N-4 https://www.utsource.net/itm/p/12442816.html

Parameter	Symbol	Min	Typical	Max	Unit
Supply Voltage	Vcc	4	-	12	V
Quiescent Current (Vcc=6V)	Iq	-	4	-	mA
Input Impedance	Zi	50	-	70	kΩ
Output Impedance	Zo	0.1	-	0.8	Ω
Gain	Av	20	-	200	dB
Bandwidth (Av=20)	fBW	300	-	300	kHz
Bandwidth (Av=200)	fBW	12	-	12	kHz
Slew Rate	SR	-	0.5	-	V/μs
Power Output (Vcc=6V, RL=8Ω)	Pout	-	0.7	-	W
Power Output (Vcc=12V, RL=8Ω)	Pout	-	1.0	-	W

Instructions for Using the LM386N-4

1. Power Supply:

   • The LM386N-4 operates with a supply voltage ranging from 4V to 12V. Ensure that the power supply is stable and within this range to avoid damage or poor performance.

2. Gain Setting:

   • The gain can be set by connecting a resistor and capacitor between pins 1 and 8. For a gain of 20, leave pins 1 and 8 open. For a gain of 200, connect a 10 μF capacitor between pins 1 and 8. For intermediate gains, use the formula: [ text = 20 times left(1 + fracright) ] where R1 is the resistor connected between pins 1 and 8, and R2 is the internal resistor (1.35 kΩ).

3. Input Connection:

   • Connect the audio input signal to pin 3. The input impedance is typically around 50 kΩ, so ensure that the source impedance is compatible.

4. Output Connection:

   • The output is taken from pin 5. For an 8Ω speaker, connect it directly to pin 5 and ground. For other load impedances, consider using an appropriate coupling capacitor to match the impedance.

5. Bypass Capacitor:

   • Place a 10 μF bypass capacitor between pin 7 (ground) and pin 6 (Vcc) to filter out any noise from the power supply.

6. Decoupling Capacitor:

   • A 0.1 μF decoupling capacitor should be placed close to the Vcc pin (pin 6) and ground (pin 7) to stabilize the power supply and reduce noise.

7. Heat Dissipation:

   • The LM386N-4 has a low quiescent current, but it can still generate heat when driving high-power loads. Ensure adequate heat dissipation, especially when operating at higher supply voltages or with heavy loads.

8. Protection:

   • To protect the amplifier from short circuits and overloads, consider adding a series resistor and a fuse in the power supply line.

By following these instructions, you can effectively use the LM386N-4 in your audio amplifier projects.

(For reference only)