One particularly lucrative design was the Automatic Gain Control circuit. Commonly interlocks are added to a control circuit. The space between L1 and L2 represents the voltage of the control circuit. A control circuit may fail in complex ways. Another control circuit employing fault mode logic gates was U.S. Pat. The above differential cylinder is also called a regenerative cylinder control circuit. A control circuit can be used to peak power. When the control circuit triggers one group of transducers, they push the rotor one step. Unfortunately, the silicon diode's different characteristics caused the automatic gain control circuit to fail. Sometimes a digital automatic gain control circuit is implemented in the demodulator. The optical coupling allows the control circuit to be electrically isolated from the load. The acceleration (vibration) signal is processed by a control circuit and amplifier. Control circuit design varies greatly among the different manufacturers and models. An elaborate control circuit was created that could switch between the two motors. GreenChip SR is a control circuit for the output stage of power supplies.