This lockable two-position servo control system was found in documentation from the 1990s. The error amplifier can be an operational amplifier and the sensors are phototransistors.
This circuit was used to regulate the speed of small DC motors of cassette recorders. However, if the...
This circuit was found in Harris' 90s documentation. The used component is uncommon today. |...
This simple power reducer, based on capacitive reactance, was found in a 1995 documentation. The...