Discussion in 'The Projects Forum' started by abdus, Jun 10, 2010.
i want to design a class AB amplifier ranges from (30-50)w.
can anyone plz send me schemetic?
find one, make it.
Post in this thread if you have problems
the amplifier i was searching for was not there..
here i have found the CLASS-AB POWER AMP..
SEE FIG-5(i want to built this one)
so can u plzz help me with the component's value,that should give a power of 30 to 50 watt??
sorry buddy, they are not complete schematics.
Just tutorials on output stages.
but i want to built such an amp..
there is a 60W amp at tht site.
Did you not find it?
Ok, 30-50W is a nice number, but...
50W per channel or total?
How many channels?
50W for what load impedance - 2, 4, 6, 8, 16 ohms?
Answer ALL those questions, then it is possible to talk about the actual design.
Here is a page from the EDUCYPEDIA on amplifier classes:
There are more pages like that on audio subjects:
Audio: Amplifiers Audio compression techniques Digital audio General overview Amplifier classes Audio file formats DSP Midi MP3
Here..try the link
I did make this amp. It outperforms every cheap amps out there.
50W total.but need to design a class AB amplifier
8 or 16 ohms load impedence
25W into 8ohms -> peak voltage is sqrt(25*8*2)=20V
Depending on the output stage, the rails should be about 25-30V.
average current for one channel at full load is 14.1/8=1.8A, peak current 2.5A
The transformer for the power supply should be about 2x20V@2A, that is 80W to be on the safe side, could be a bit less powerful if you don't plan to use it at full power all the time.
The westhost amp looks nice, but be sure to use the circuit 1a, not the first one.
PSU smoothing caps nedd to be rated for 50V, at least 4700uF each, but more is better.
The 10ohm resistor and 100nF cap on the output should be rated for higher current, I would use at least 2W resistor and a quality film capacitor rated for 50 or 63V at least.