We found this circuit in a 90s Linear Technology documentation. The circuit uses components from the time and the indicator is of the analog type.
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...