Regulated power supply (CB20555E)

This circuit uses the 7815 regulator to obtain a voltage for motor control num shield for PC. The circuit is from a documentation of 1996.

Car Battery Monitor (CB4374E)
This circuit was found in an English magazine Radio & Electronics Constructor of February 1977....
VU Meter Drive With The 741 (CB1438E )
This circuit is from a 1976 documentation. The diodes can be 1N34 or equivalent, and the power...
3V to 5V Converter (CB4823E)
This circuit is from a Maxim manual and can be used to power shields from batteries. The circuit...