[Qcwa] does anyone know how?

[qcwa@mailman.qth.net]

A push-pull amplifier has two tubes (or transistors) which are connected to 
operate 180 degrees out of phase.  Therefore, when one tube is "pushing" 
electrons, the other is "pulling" electrons.

Typically, push-pull amplifiers operate in class B or class AB.  In class B, 
one tube conducts during the positive half-cycles and the other conducts 
during the negative half-cycles.  In class A, both tubes would conduct during 
the entire cycle.  Class AB is in between class A & class B.

Any amplifier can be configured to oscillate (often when you don't want it 
to).  So, a push-pull oscillator is merely a push-pull amplifier set to 
self-oscillate.

Hope this helps.

73, Ray, K9DUR
BSEE


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