Lets see
how to make an audio amplifier
which you can use with any of your
musical instruments like
guitar,piano and with ipod and other
devices.So Lets begin the journey....
Disclaimer: If following this guide
anything damages i shall not be
held responsible.Do it at your own
risk.
STEP 1: COMPONENTS
You need the following components
1- LM 386 semiconductor (IC)
2- 100 micro Farad capacitor
3- 220 micro Farad capacitor
4- 10 ohm resistor
5- 5 kilo ohm variable resistor
6- 100 ohm variable resistor
7- 0.01 capacitor
8- 0.047 capacitor
9- Wires
10- 9V Battery clip
11- 9V Battery
12- 3.5mm stereo jack male
13- 3.5mm stereo jack female
14- Project board (or you can use
dotted board and solder)
You can find these electrical
components from your nearest
electronics store.These all
components are easy to find and are
common so you won`t have a hard
time to find it.
STEP 2: CIRCUIT DIAGRAM
The circuit which we are going to
make is.
Thanks to cld000 for schematic
drawing.
STEP 3: PLACING THE IC
1- Place the LM 386 in the project
board as show in the image.
2-If you pick the IC in front of you
(so you can read what is written on
it) then the lower left pin is 1 and
the pin number increase
anticlockwise.Take a wire and join
the 3rd pin to 4th pin(GND pin).
STEP 4: 0.0.1 CAPACITOR
Join the one pin of 0.01 capacitor
with the 2nd pin of IC. The other pin
of the capacitor should be joined
with the INPUT.
STEP 5: GAIN CONTROLLER
4-Now join the 1st pin of IC with the
A pin of the 5 k ohm variable
resistor.
Join th A pin of this variable resistor
with the C pin.Lastly join the 8th pin
of IC with the B of this variable
resistor.This becomes the GAIN.
STEP 6: 100 MICRO FARAD
CAPACITOR
5-Join the +ve side of the 100 micro
Farad capacitor with 6th pin of the
IC.The -ve of this capacitor should
be joined with GND pin (4th pin of
IC).
STEP 7: 10 OHM RESISTOR &
0.047 CAPACITOR
6-Join the 5th pin of IC with one
side of 10 ohm resistor, the other
side of the resistor should be joined
with the one pin of 0.047 capacitor.
The second pin of the capacitor
should be joined with the GND pin
(4th pin of IC).
STEP 8: VOLUME CONTROLLER
7-Now again join the 5th pin of the
IC with the +ve side of 220 micro
farad, the -ve side of the pin should
be attached with the A of the 100
ohm variable resistor.The B pin of
the variable resistor should be
connected to the GND pin (4th pin of
IC).This becomes the Volume
controller.
STEP 9: INPUT AND OUTPUT
8-Join the +ve pin of the 3.5mm
stereo jack female with the C of the
100 ohm variable resistor.And the
GND of the female jack should be
attached with the GND of the IC (4th
pin of IC).
9-Join the +ve of the 3.5 mm stereo
jack male with the other side of the
0.01 capacitor and join the GND of
the male jack with the GND of the IC.
STEP 10: TESTING
10- Last but not the least join the
+Ve of 9V battery with the 6th pin of
IC and -Ve of the battery with the
4th pin of IC.
Congratulation !!! you have made
your own simple audio amplifier.
Now the time to check it out.Join the
male jack with your mp3 player or
musical instrument and female with
the speakers.Now adjust the Volume
and Gain to get the best and loudest
possible sound.I should notify you
that with this amplifier only one
speaker will work.And do the
adjustment from low to high.Do the
adjustment carefully or it can
damage your speakers.
You can change the input jacks as
your requirement.You can add a 220
micro farad variable capacitor
instead of simple 220 micro farad
capacitor to change the bass.
ENJOY !!!!
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