This circuit was obtained in an American publication of 1970, making use of components of the time. Components may be replaced by equivalents.
This circuit was obtained in an old Elektor. It is a reference, since the integrated products of the...
The circuit shown in the figure can be used to connect a loudspeaker to an amplifier only after...
With the light falling on the LDR, the relay closes its contacts by activating a warning system. The...