Linear photometer (CB7366E)

This circuit was found in a 1967 Philips publication. Transistors support equivalents and modern equivalents can be used.

RMS Current Meter (CB5363E)
This circuit is from a 2005 Linear Technology application manual. The circuit uses a commercial...
Overtemperature Alarm (CB12156E)
We found this circuit in an English publication from 1982. The power MOSFET can be of any type and the...
Integrated Intercom (CB16336E)
We found this circuit in a 1982 documentation. An intercom to be good must be sensitive and have...