20 watts rms using class A is going to be expensive and generate lots of heat. A modern class A/B amp of the same power rating would be much more practical and you will not be able to hear a diffence in sound if your honest.
Hi guys i need to build a simple circiut that can show switching response time in the relays that has got base timers in them ,and also check all contacts of the relay and its coil for funtionality.
Thanks everyone for the answers that gave me,but the problem with that circuit is that is a projekt that i have..so i must stick woth the characterisitcs that that they have gave me..
What circuits are needed for the specified amplifier:
1) 600 ohm input impedance.
2) Enough voltage gain so that 10mV input produces 20W output into 8 ohms.
3) Class-A.
4) Attenuate frequencies below 100Hz.
5) Attenuate frequencies above 10kHz.
6) A power supply for it.
7) Cooling for it.