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.
The purpose of this circuit is to improve a trigger circuit using a zener diode. The circuit was...
The Exclusive-NOR function can be achieved simply by adding one more NAND gate as an inverter to...
This simple Philips circuit from the 1960s can use any general-purpose transistor. The signal is...