We found this circuit in an Electronics Now from the 1990s. The circuit crashes when light strikes the sensor. Instead of the alarm a relay can be used to drive higher power devices.
This circuit is from an old documentation. Integrated circuit 723 is not common today. The power...
This small receiver for the medium wave range was found in Radio Electronics magazine from July...
This astable multivibrator configuration causes two LEDs to alternately flash at a frequency...