Perfect Square Wave with 555 – A simple circuit that uses the 555 timer to produce a stable perfect square wave. Formula, examples.

This off-delay timer is ideal when we want to schedule the automatic shutdown of a device after a predetermined time, using the well known 555 IC

High current pulse generator using a 555 timer and a voltage regulator. This circuit can be useful for DC Motor control. Light control, etc.

This 5 to 30-minute timer circuit achieves times ranging from 5–30 minutes using the 7555 integrated circuit (CMOS version of the popular 555 timer).

Electronic Doorbell circuit that lets know that someone is at the door. Made with 555 timer and 4017 decade counter allowing to change the tone of each note

Long duration timer or long delay time with NOR gates. This very simple circuit allows us to turn off the TV or radio in the event that we fall asleep

This circuit has many applications on places where it is necessary to activate and deactivate (connect and disconnect) an electrical or electronic device.

This automatic night light using 555 IC turns on lights when there is no daylight. The circuit is perfect for lighting single places such as the garden, the front door of the house, the entrance to the garage, etc.

With this sound activated flash circuit, you can achieve incredible pictures of the most unexpected moments. Pictures like a water balloon that just burst and the water still floats in the air, or when an object of any type explodes.

This circuit is very interesting because it can detect or warn of the absence or delay of an expected pulse, which under normal conditions should be received at predefined intervals.

This Time delay circuit using Triac and 555 Timer is very useful when we want to activate or switch on, appliances or devices that work on alternating current (AC), after a preset time.

This event sequencing circuit uses several 555 timer to control an event sequence, where an event does not start if the previous event has not ended.