Mixer with Self-adjusting Height

For a step change in of magnitude AF, we may write in the Laplace domain  

The initial slope depends on the relative amplitude of the change and the time constant. The final steady state value, when becomes  

The change in level, when t- 0, as a result of a step change with magnitude AF, becomes  

Taking the limit to s is not required since the function is independent of 5. This means that the change in time is time independent and is therefore constant The final level, for becomes  

The level will show a continuous change in positive or negative direction, depending on the sign of AFa- 

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