Hello,
I'm having some trouble with a class B amplifier. What I am trying to do is combine a class A (as pre amp) and a Class B amp (push pull)to drive a 8 ohm speaker. I know this will not produce the best quality sound but it's a learning curve.
So far im still in the simulating fase, but i cant get it to work properly. The pre amp amplifies the Voltage signal properly when no load is attached to the output (+/-200 mV to +/-5 V). But when i connect the B class amplifier ( http://cnx.org/content/m32262/latest/ ) the output of the pre amp drops significantly.
As i understand it the input impedance of the class b is approx hfe*Re. Incase of a 8 ohm speaker this is 800 ohm (hfe=100), this seems to be quite low. And is probably the cause of the drop in amplification, what am i doing wrong? here?
Thanks,
I'm having some trouble with a class B amplifier. What I am trying to do is combine a class A (as pre amp) and a Class B amp (push pull)to drive a 8 ohm speaker. I know this will not produce the best quality sound but it's a learning curve.
So far im still in the simulating fase, but i cant get it to work properly. The pre amp amplifies the Voltage signal properly when no load is attached to the output (+/-200 mV to +/-5 V). But when i connect the B class amplifier ( http://cnx.org/content/m32262/latest/ ) the output of the pre amp drops significantly.
As i understand it the input impedance of the class b is approx hfe*Re. Incase of a 8 ohm speaker this is 800 ohm (hfe=100), this seems to be quite low. And is probably the cause of the drop in amplification, what am i doing wrong? here?
Thanks,