Any sensor or piezo capsule can be used as a sensor in this circuit. The integrated circuit is also common in our days and a table of sensor voltage levels.
The circuit shown in the figure can indicate the presence of static charges by lighting a 6 or 12 V...
This double time constant circuit for resistive loads was found in documentation from the 1980s. The...
This simple circuit was found in the Spanish magazine “Todo Electronica”, in an edition of 1996....