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How much power does a LM386 speaker need?
For the rest of this article I’ll refer to the LM386N-1, as it’s the chip I had laying around and represents the most basic of the variants. The chip requires a minimum of 4V to operate, with a maximum of 12V. The LM386 was primarily designed for a 4Ω speaker load, but is rated for 8Ω and 32Ω loads as well.
What kind of transistor does the LM386 use?
The schematics show the circuit with a 2N3906 general-purpose PNP transistor, but the 2N2907 and 2N4403 have also been used successfully. In circuits 1, 2, and 3, the LM386 inputs are connected directly across the tank circuit and use the LM386 as an RF envelope detector.
What are pins 1 and 8 in a LM386?
Pins 1 and 8 are used to adjust the gain level from the default 20x using specific values of connected capacitors. These are the standard op-amp inputs. Typically in a simple LM386 circuit, the negative input will be tied to ground while the positive input will receive the audio signal from the source.
What are the different flavours of the LM386?
The LM386N (“N” signifying the preferred DIP package for our purposes) comes in 4 flavours: LM386N-1, -2, -3 and -4. The “3” and “4” versions have slightly higher output power, with the “4” version more so given its ability to handle more input voltage (at the cost of a higher minimum voltage requirement).
Which is better a 3 or a 4 LM386?
The “3” and “4” versions have slightly higher output power, with the “4” version more so given its ability to handle more input voltage (at the cost of a higher minimum voltage requirement). For the rest of this article I’ll refer to the LM386N-1, as it’s the chip I had laying around and represents the most basic of the variants.
What is the voltage gain of the LM386 IC?
The integrated chip LM386 is a low power audio frequency amplifier requiring a low level power supply (most often batteries). It comes in an 8-pin mini-DIP package. The IC is designed to deliver a voltage amplification of 20 without external add-on parts. But this voltage gain can be raised up to 200 (Vu = 200) by adding external parts.