Construction of circuit
You will need to collect the following equipment before you start soldering your circuit:
Soldering iron and stand
Solder wire
Side cutters
Pliers
Procedure for construction
1.
Solder the resistors into your PCB. Take care to insert the correct resistor into the correct
place by checking the coloured bands
2.
Solder the diodes in place. Ensure that the silver band on the diode aligns with the markings
on the PCB
3.
Solder the power switch in place
4.
Solder the stereo socket in place
5.
Solder the TEA2025B in place. Ensure that the notch in the chip aligns with the notch on the
PCB. Be careful because the legs are close together - make sure you don’t connect the legs
together with solder bridges as this will stop the circuit working. An I.C. socket is not used as
the PCB acts as a heat sink.
6.
Solder the LED in place. Ensure that the longer leg aligns with the + on the PCB
7.
Solder the terminal blocks in place ensuring that the holes for the wires face outward
8.
Solder the DC power socket in place
9.
Solder the non-polarised capacitors in place
10.
Solder the electrolytic capacitors in place. Be careful to ensure the longer legs are inserted
into ‘+ve’ hole.
Speakers
The PCB has been designed to power 2 full range speakers. If you have chosen a kit that is not
supplied with speakers, you will need to add your own. These should have either a 4 or 8Ω
impedance and the power rating should be equal to or greater than the maximum power output of
the amplifier.
If you are using a kit which has speakers supplied, you will need to solder the speaker cable to the
speakers.
1.
Cut the speaker cable into 2 equal lengths
2.
Peel the two halves of the speaker cable apart about 25mm at each end (see diagram)
3.
Strip about 5mm of insulation from the ends. Twist the strands of each loose end to keep
them tidy and then tin the wires
4.
For each speaker, solder the side wire with the black stripe to the + speaker terminal and the
plain side of the wire
Connecting Speaker Outputs
1.
Take the first speaker and connect the wire with the black strip into the +VE side of the
terminal block marked LEFT
Содержание RKAmp2
Страница 4: ......