Car Burglar Alarm using two 555 timers

This is a simple Car Burglar Alarm circuit that uses a dual contact relay and two 555 timers, each of them working as a monostable multivibrator.

The alarm will activate the car horn, approximately 5 seconds after either door is opened and has not been properly closed.

This simple humidity sensor circuit using a 555 timer, shows us the humidity level that a ground under test has. To achieve the goal, a couple of probes are used.

These probes are placed on the ground to be tested.

This ON-OFF Switch circuit using a 555 timer is simple, useful and easy to implement.

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

555 IC Tester Circuit (PCB)

This 555 IC tester circuit, allows us to make sure that this integrated circuit works properly. This same test can be achieved by operating the 555 as astable multivibrator, but this test does not allow
to observe its operation in detail.

12 VDC to -12 VDC converter circuit with a 555 IC.

This 12 VDC to -12 VDC converter circuit gives -12VDC (negative 12 volts) from a power source of + 12VDC (positive 12 volts), with very few components.

Refrigerator door alarm circuit with two 555 timers

This refrigerator door alarm circuit alerts you when the door has been left open. Very important, because the power consumption increases when this happends. It uses the popular 555 timer IC

Time Delay circuit using Triac and 555 timer

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

Event Sequencer Using 555 Timer

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.

Tone generator using two 555 timers

This circuit uses the well-known 555 integrated circuit to generate a range of sounds that are heard through a small loudspeaker.

This automatic night light using 555 circuit automatically turns on the lights at the time when there is no daylight.

This circuit is perfect for lighting alone places like the garden, the front door of the house, 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.

5 to 30 Minute Timer Circuit using 7555 IC

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).