Solar timer (CB20498E)

This very low consumption circuit can be powered by a solar cell. The time indication is given by a microammeter.

Zener diode test (CB7958E)
Found in a 90s Popular Electronics, this circuit aims to find the voltage of a zener diode up to...
1.5 A Regulator (National Semiconductor) (CB1203E)
The LP380502SD-ADJ integrated circuit consists of a low voltage drop-out (LDO) regulator with...
50 to 150 MHz Oscillator (CB6513E)
We find this oscillator in a 1980s documentation. The frequency depends on the crystal and the...