Non-inverting amplifier (CB9018E)

Found in documentation from the 70s, this circuit uses an operational one from that time. It goes for modern equivalents.

Very High Voltage generator (CB15714E)
This circuit generates voltages of tens of thousands of volts for projects such as electrostatic filters...
Resistor voltage control (CB20758E)
This circuit was found in an old American documentation. The operational used is of the...
NiCad Charger (CB15654E)
Rechargeable Nicad batteries type AA, C or D can be recharged with this circuit, which is nothing...