Simple RPM Counter using IC 555

RPM counters are used to measure Speed of Motors (AC/DC) or any Rotating Object. They measures and indicates current Rotating Speed of Motor. They are very essential in applications like Speed Cont...

Day and Night Indicator using IC 555

The main aim of the Day and Night Indicator circuit is to help us to turn on the lights as the night falls automatically and as the dawn sets in the Day and Night Indicator automatically gets switc...

DIY Homemade Melody Door Bell Circuit

In most of the homes the door bells are conventional ding-dong type. Most of us don’t like its sound. Due to mechanical moving parts with spring mechanism its long term durability is question...

How to make Smart DC fan

In almost all flats the elevators (lifts) are essential. In high rise buildings there are 2 or 3 or even more lifts. These lifts are major source of electrical energy consumption. Why? The lifts re...

Electronic Mosquito Repellent Circuit

This circuit is very much easy to understand and use. A circuit with minimum components repel mosquito Large number of things like coils, creams, oils is available in the market to repel mosquito. ...

Circuit and mechanism of a quartz watch

1. Battery
2. quartz oscillator
3. microprocessor
4. circuit board
5. coil magnet motor

...

Intelligent motor control centre

Serial communication network equipment is used to couple all the microprocessor based units. Figure 7.5 shows the basic arrangement of a typical system. The number of switchboards and motor control...

How to make Emergency Light

The circuit of automatic emergency light presented here has the following features: 1.When the mains supply (230V AC) is available, it charges a 12V battery up to 13.5V and then the battery is disc...

TV remote control Blocker

Just point this small device at the TV and the remote gets jammed . The circuit is self explanatory . 555 is wired as an astable multivibrator for a frequency of nearly 38 kHz. This is the frequenc...

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