This circuit was found in General Electric documentation from 1964. It makes use of a PUT, called the PNPN planar key at the time. The circuit has two supply voltages.
August 2016 - Mouser Electronics already has in stock the new MCP1501 voltage references from...
Instead of LED bulbs, LEDs with a series 470 ohm 1k resistor can be used in this 80's circuit....
We find this automatic battery charger in an 80s ON Semiconductor circuit and application manual. Bridge...