High impedance stage (CB20564E)

This high input impedance amplifier stage was found in a 1963 documentation. The transistor germanium of the time.

5 V x 5A Regulator (CB15033E)
This circuit was found in an old French documentation, but it is current if we use the BC547 for...
Charge & Discharge Current Monitor (CB5406E)
This circuit is from a 2005 Linear Technology manual. The circuit is powered by 3.3 V but can...
Transformerless Power Sup (MSB001E)
This Power supply is intended to Power small loads with currents up to 30 mA. The voltage depends...