This circuit was obtained in a documentation about old neon lamps. The circuit indicates when a home appliance with thermostat and heating element is on.
This Sample & Hold circuit configuration is from an American 1980s documentation. The circuit uses...
By LED flashes you can get an idea of the degree of moisture in the soil. The sensors are wires...
Found in an old Popular Electronics, the purpose of this circuit is to give a strong discharge in an...