Found in a 1969’s EDN, this circuit provides 4.5 V with a 100mA current for digital logic. The circuit uses transistors from the era.
Found in an 80's Electronic Design, this circuit is based on the ICL7107 which is not an easy...
This circuit is used as a magnetic field sensor and is based on a Texas Instruments HaII Effect...
This circuit was found in a Japanese documentation of the 70's. It uses transistors of the era and is...