Found in a 1949 Radio Electronics, this 4-tube circuit was fed directly from the mains with a half-wave rectifier.
This circuit is recommended by Texas Instruments in the datasheet of the TL317, equivalent to...
November 2016 - Texas Instruments' new TLV8802 nano-power operational amplifiers for wireless...
The basic configuration for a 4017 when used as a decade divider with one-of-ten decoded outputs...