Simple and low cost. The
optimal supply voltage is around 50V, but this amp work from 30 to 60V.
The maximal input voltage is around 0.8 - 1V. As you can see, in this
design the components have a big tolerance, so you can build it almost
of the components, which you find at home. The and transistors can be
any NPN type power transistor, but do not use Darlington types... The
output power is around 60W.
- capacitor C1 regulates the low frequencies (bass), as the
capacitance grows, the low frequncies are getting louder.
- capacitor C2 regulates the higher frequencies (treble), as the
capacitance grows, the higher frequencies are getting quiter.
- this is a class B amplifier, this means, that a current must flow
through the end transistors, even if there is no signal on the input.
This current can be regulated with the 500Ù trimmer resistor. As this
current incrases, the sound of the amplifier gets better, but the end
transistors are more heating. But if this current decrases, the
transistors are not heating so much, but the sound gets worse...
14. 9. 2005.
Download this project in .doc format