When the power is cut off, this circuit keeps the flashlight on for a while, allowing it to be located. The circuit is from a Radio Electronics from September 1992.
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
This circuit generates sinusoidal signals from 15 Hz to 15 kHz. The circuit is from Electronics Now...
In the figure a circuit that is the basic application of NE567 for the detection of a tone applied to...