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.
Similar to other circuits found in this section, this circuit is from a 1996 Electronics World;...
This two-digit timer was found in the 1983 Special Projects issue of Radio Electronics magazine. The...
The circuit shown is from Motorola's Linear Databook published in 1990. As the CI is uncommon...