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 found in the November 1992 issue of Radio Electronics magazine. The circuit has...
This 70 kHz oscillator is used to erase tapes in pre-recording. The circuit is from 1968 General...
This circuit is from a 1977 National Semiconductor manual. The circuit directly indicates the...