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  • 119 x 555 Timer Circuits

    Browse through a total of 119 555 timer circuits and projects including the timer’s datasheet. There are simple circuits for begginers and advanced engineers.

    555 datasheet   555 duty cycle   555 metronome   555 reset function   555 time delay relay   inverted 555 timer   pulse generator  

    Automatic Hand Dryer Circuit Now and again ardent hobbyists looking to add something special and individual to their rest room/bathroom want an automatic hand-dryer. This design guide exhibits that you need barely anything more than a handful of inexpensive components and the right enclosure. Here is how to build a versatile hand-warmer at a low cost!...
    Edge-Triggered 555 Monostable Multivibrator While the 555 oscillator IC is a very versatile device, it can also be quite tricky and solutions are not always obvious. Such is the case with this edge-triggered 555 monostable circuit. By differentiating the trigger signal, the monostable multivibrator times out normally regardless of the trigger signal length. 555...
    Door Opening Alarm with Sound Alert The door opening alarm circuit or “Front Office Visitor Alert” is used for alerting you when a customer is at your office/shop. It will produce a beep sound when each new customer or visitor is entering, and will automatically switch OFF after few seconds. Schematic of the Door Opening Alert Circuit 555 datasheet In this...
    Two-Door Buzzer with Display The Two-door Buzzer with Display is applicable and well suited to be used in a house having two gates or doors that are distant from each other. It helps the person inside the house by providing an alarm and a number display determining which door where the visitor is. It also saves time and effort as the owner does not need...
    Dew Heater Controller For Telescope Dew (condensed moisture) is one of the astronomer’s worst enemies, and all telescopes are subject to the dew problem. If no precautions are taken, it can easily destroy a perfect observing night, as it forms on mirrors and lenses, thus it is required for almost every amateur astronomer to have some kind of dew control...
    Crazy Multicolor Flashing LED Globe! Nowadays, single-color and multi-color flashing LEDs are easily available, which obviates the requirement of external chips to produce fascinating lighting effects. What can we do with one piece of such a single color flashing LED, and two pieces of multicolor flashing LEDs? Here is an ultrasimple circuit of an LED Globe wired...
    Zener Diode Tester Circuit Diodes whose reverse-breakdown characteristics are controlled precisely during manufacture are called as Zener diodes and are intended specifically for operation in the reverse breakdown mode primarily as inexpensive voltage references. An uncomplicated circuit application of a ZD is the common shunt voltage regulator. If you...
    Piezo Trigger Switch Circuit Piezo Trigger Switch circuit described here is a microcontroller-compatible shock/impact sensor switch module works on 5VDC supply. The whole circuit can be assembled on a 5×7 cm common circuit board. The piezo-ceramic element (PZ1) can also be mounted on the PCB without any difficulty. The module gives a “Logic-High” (H)...
    Power Failure Alarm This minuscule power failure alarm circuit is a power supply monitoring device that will set off a piezo-speaker when the ac mains mains supply cuts off. It is very helpful to indicate the loss of power supply to some power-critical instruments such as a lifecare device installed in a hospital. Alarm activation at the right...
    Fascinating Flowervase: Sound Activated Motor Driver If you are looking for an idea to build your own simple electronic gift, your search may end here! Described is a minimalist design for you, realized using a handful of discrete components. The major component in this design (Sound Activated Motor Driver) is an inexpensive, and widely available robotic motor, which is nothing...