This circuit with 1% regulation aims at replacing mercury cells. We found it in a 1967 documentation. Transistors can be replaced with modern equivalents.
This circuit converts a positive voltage to negative, with maximum output current of the order of...
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...
The frequency of this circuit is approximately 1 Hz. Whenever the output is at low level, the LED...