Amplifying Stage (CB6127E)

This circuit is from a 1967 publication. The configuration holds true for modern transistors having a feedback across R2.

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20 kHz band pass filter (CB9778E)
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800 Hz Sinusoidal Oscillator (CB13572E)
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Servo Control (CB12050E)
This control for a small servomotor with a current of a few hundred milliamps was found in an...