Audio Amplifier
www.kitronik.co.uk
Build Instructions
Before you put any components in the board or pick up the soldering iron, just take a look at the
Printed Circuit Board (PCB). The components go in the side with the writing on and the solder goes on
the side with the tracks and silver pads.
You will find it easiest to start with the small components and work up to the taller larger ones.
Step 1
Start with the three resistors (shown right):
R1 is a 10K (brown, black, orange coloured bands)
R2 is a 100
(brown, black, brown coloured bands)
R3 is a 1
(brown, black, gold coloured bands)
The text on the PCB shows where R1, R2 & R3 go. Make sure that
you put the resistors in the right place.
Step 2
Solder the Integrated Circuit (IC) holder in to IC1. When putting this into the board, be
sure to get it the right way around. The notch on the IC holder should line up with the
notch on the lines marked on the PCB.
Step 3
There are three ceramic disc capacitors, the smaller one is a 470pF capacitor
and is printed with the number 471. This should be soldered into C1. The other
two capacitors are 100nF capacitors and are printed with 104. These need
soldering in to C2 and C3.
Step 4
The other three capacitors are electrolytic capacitors, the two smaller capacitors are
marked 100
F. Place these two capacitors in to the board where it is labeled C4 and
C5. Make sure the device is the correct way around. The capacitors have a ‘-’ sign
marked on them which should match the same sign on the PCB. The bigger
capacitor is a 220
F, which should be soldered in to C6.
Step 5
The three connections to your amplifier PCB need to go through the strain relief
holes as shown in the picture on the right.
Start with the connection labeled Speaker. The kit is supplied with ½ a meter of
twin cable with a 3.5mm Jack connector on one end. This cable will be used to
connect both the speaker and the MP3 player. You will need to cut a length from the end that does
not have the jack connector on which will be used to connect the speaker. Make sure you leave
enough cable so that you have a long enough lead to connect your MP3 player!
Take the piece of wire that you have cut off and strip the ends of the wire. Connect one end to the
two terminals on the speaker and the other end to the board marked speaker. It does not matter
which way around these connections go.
The middle connection is for the power. The PP3 battery clip (shown left) should be
attached to the power connection. Connect the red wire to ‘+’ and the black
wire to ‘-’.
