Found in the 1969 neon lamp documentation, using neon lamps this circuit provides 18 V regulated with 0 to 4 mA current. The lamps are types of the time.
We found this parking light circuit for automotive use in a Texas Instruments optoelectronics...
This circuit can be used in a signal level indicator with LEDs. The circuit is from an Electronics Now...
We found this configuration in a 70s American documentation. The circuit makes use of operational...