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FUNCTION BLOCK
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DESCRIPTION
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- This is an audio power amplifier, designed to amplify audio signals loud enough to drive a speaker.
- This amplifier can produce up to 1Watt of power.
- It has very few components.
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CIRCUIT DETAILS
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- The gain of this amplifier is set at 20.
- The gain can be increased to 200 by placing a 10uF capacitor between pin1 and 8, (positive terminal to pin 1)
WARNING - At higher powers and voltages, the IC may get hot and need a small heatsink. Take care not to burn your fingers if checking it.
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Input
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Circuit Diagram
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This should come directly from the wiper of a volume control or other decoupled audio source.
With the gain set at 200 it can amplify microphones directly via a volume control.
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Output
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The output should go directly to a speaker. Since the output already has a capacitor, another one in series with a speaker is not needed.
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PACKAGE DETAILS
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The LM386N amplifier comes in an 8pin DIL package. |
Pin
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When using ICs, it is always best to use an IC socket so the IC can be removed easily if needed.
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| Written by Phil Townshend - 2008 |
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www.edutek.ltd.uk - Working Electronics For Students & Teachers
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