We found this circuit in an 80's manual. The same configuration can be adapted to make use of modern operational amplifiers. The power supply is symmetrical.
This circuit can be used as a shield for microcontrollers. The circuit is from American...
This car battery power supply was found in the June 1990 issue of Radio Electronics magazine....
August 2017 - STMicroelectronics' BlueCoin development environment is available at Mouser...