Optical potentiometer (CB22159E)

This voltage-controlled potentiometer using an LDR was found in an English documentation. LDR is common and LED of any type.

22 W BTL Amplifier TDA1519A (CB15379E)
This amplifier is from the Philips Databook of 1990. The circuit is suitable for automotive use...
Three Transistors Radio TR3D (CB18389E)
This is a Japanese commercial radio from the 60s. The circuit is listened to by phone and is...
High CMRR Instrumentation Amplifier (CB4930E)
Found in a 1980s documentation, this amplifier features high common mode rejection. The operating...