Introduction: LM386 Audio Amplifier
I wanted to design an audio amplification circuit for a future project so i just wanted to design this one for now so i get an understanding of how it works. This is a very basic circuit that you can find all over using an LM386 integrated circuit i got from RadioShack.
Step 1: Obtain Parts
All Components can be found at RadioShack.
Multipurpose PCB with 417 Holes
5-15 Volt DC power supply (4 AA or 1 9v Battery)
8 Ohm Speaker
Audio Source e.g. iPod
8-Pin Retention Contact
IC1 IC LM386 Audio Amp IC
R1 Resistor 10 Ohm
R2 Resistor 1K Ohm
R3 Potentiometer 10K Ohm
R4 Resistor 10 Ohm
C1 Capacitor 220 Micro Farad
C2 Capacitor 10 Micro Farad
C3 Capacitor 220 Micro Farad
Step 2: Place Components
Arrange components the best you can using the wiring diagram. i placed them as close together as i could, but it may be easier to spread them out a little more or breadboard this circuit first. I highly suggest breadboarding first just to get a feel of the arrangement, prior to soldering.
Step 3: Observe Diagram
Look through the wiring diagram to see what components need to be connected to what prior to soldering. This is a basic wiring diagram, one of a hundred I found online, very basic. The one i used was from this website http://www.rason.org/Projects/icamps/icamps.htm.
Step 4: Solder Components
Solder components carefully to ensure there are no shorts, also ensure all connections are made at all points.
Step 5: Clean Up and Test
Trim component leads and clean solder joints. Be sure to double check connections to make sure a connection isn't left out. Hook up a 5-15 Volt DC power supply, your audio source, and 8 Ohm speaker and test it out. Be sure to ground out the audio sources audio low line and ground out the speakers ground wire to the circuits ground.
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