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.

Bootstraped Source Follower (CB6156E)
This configuration was found in an English magazine from 1965. It is valid for any junction FET. The...
First-order active filter with the 741 (CB25593E)
This circuit for a frequency of 1 kHz uses a symmetrical source. Other operational circuits can be...
Inductance Meter (CB12449E)
The transistors in this circuit from a 1994 technical publication may be BC548 and the 12 V supply...