Found in an American documentation from the 90's, this circuit aims to light a neon lamp with voltages from 5 to 15 V. It is a small inverter that operates close to 15 kHz.
This circuit for signals around 4.5 MHz for old analog TV was found in the September 1992 Radio...
This circuit warms a light bulb slightly so that the wind through it alters the filament...
Suggested by Sprague in the 90's documentation, this circuit applies to AC motors. The...