This circuit is from LinearTechnology Applications of 1997. The circuit uses components of the time used to raise the voltage of a battery from 3 to 6 V.
We found this circuit in a Radio Electronics from February 1966. The transistor is from the time...
The circuit in figure 10 uses two of the 4001's four ports to trigger a relay in a timed manner. The...
This circuit is from American documentation. The components used are still common. The power...