This circuit was found in old documentation, however the components used are common today. The selection of times is done by switch and the 556 consists of a double 555.
This simple metal finder uses a 100 uA indicator. The exploration coil must be constructed in a...
This resistance meter has a linear scale, converting resistances to voltage. The operational...
This circuit was found in a 1995 documentation. Its purpose is to indicate voltage levels that are...