Found in Electronic Design, this circuit with the 555 has the extended times by using the transistor in the timing network.
This circuit uses a 4 ½-digit indicator of the type TIL33oA (1 unit) and TIL321A (4 units). Driver...
The circuit shown consists of a NO and NC sensor system for alarms. The output must be connected to a...
From a 90s Popular Electronics, this circuit emits pulsating signals for different types of...