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bob85, I am not sure what you are seeing or what type of circuit you have tested.

If a constant current is supplied to the base-emitter junction by the bias circuit, and there is a coupling capacitor to block the bias voltage and to allow the AC signal to be added, Kirchhoff's current law will be intact and the algebraic sum of the currents entering the base-emitter junction will be bias plus signal.

The load can change impedance values between 0 Ohms and some maximum ohm value which will be a function of the saturated supply voltage = Constant Current x Maximum Load Ohms.

The current doesn't change, so how can the class of operation change? I guess I am confused as well...

Maybe I should design you a circuit to test if you are willing?

[QUOTE="ken white, post: 168673, member: 2405"] bob85, I am not sure what you are seeing or what type of circuit you have tested. If a constant current is supplied to the base-emitter junction by the bias circuit, and there is a coupling capacitor to block the bias voltage and to allow the AC signal to be added, Kirchhoff's current law will be intact and the algebraic sum of the currents entering the base-emitter junction will be bias plus signal. The load can change impedance values between 0 Ohms and some maximum ohm value which will be a function of the saturated supply voltage = Constant Current x Maximum Load Ohms. The current doesn't change, so how can the class of operation change? I guess I am confused as well... Maybe I should design you a circuit to test if you are willing? [/QUOTE]

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