Adjustable reference (CB21540E)

We found this circuit with 5.3V zener in a Philips publication from the 60s. The op amp could be a modern equivalent.

CMOS Touch Switch (CB12091E)
This circuit, obtained in a 1983 magazine, can drive loads up to 100 mA if the transistors are...
Monostable LM139 (CB15529E)
It is possible to design a monostable multivibrator around a voltage comparator of the four...
Voltage inverter (CB23691E)
This voltage inverter circuit is from a Radio Eklectronics from October 1965. It was used in...