Friday, May 21, 2010


This Kit contains the essential components to build a low
voltage, high power stereo 3W amplifier module using the
Rohm 12V Dual Power Amplifier, BA5406. Not included are
speakers or speaker cables. This is not only to save weight
in the Kit but also because such items are often a matter of
personal preference by the user. Some users may choose to
spend money to buy the top quality speaker cables,
connectors and speakers. While others may have all these
items already in their junk box
The kit is constructed on single-sided printed circuit
boards. Protel Autotrax & Schematic were used.

Add the lowest height components to the board first - the
resistors. Be careful to get the electrolytic capacitors in the
correct way around. The positive lead is marked on the
overlay. The negative lead is marked on the body of each
capacitor. The four MPE (metallized polyester) capacitors
can go in either way around. You can use your own
heatsink if less than 8 oC/W. Never operate the amplifier
without a heatsink attached.
The following items have to be supplied by you:
·  suitable 3, 4 or 8 ohm speakers
·  suitable cables
Solder the power & audio cables direct to the pads
provided on the PCB.

The BA5406 contains two sets of AF power amplifiers. It
delivers 5W x 2 into 3 ohm loads with a 12V supply. It has
minimal power-on pop noise and has immunity to supply
voltage drop. It also has minimal RF radiation.
Recommended supply voltage: 5-15V max. Typical 12V.
Ideally the power supply should be able to deliver over
2.5Amps. This means that a typical ‘cheap’ plugin power supply (wall wart) will not be good enough. The power
supply leads should be as short as possible. Quiescent
current 20-70mA, typically 40mA.

Resistors 1/2W or 1W carbon film, 5%:
2R2 red red gold R3 R4 ...........2
120R brown red brown R1 R2 ..........2
0.22uF, 224 MPE C1 C2 C11 C12............. 4
47uF/16V ecap C3 C4 C5 C6 C7 C8.............. 6
470uF/16V ecap C9 C10 ...........2
Heatsink HS-210 ...............1
12mm screw & nut................. 2sets
BA5406 IC ................1
K90 PCB .................1

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