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Here is a simple DC motor speed controller circuit that can be configured to control the sweep rate of automobiles’ windscreen wiper. The circuit comprises a timer NE555 (IC1), medium-power driver transistor BD239 (T1), high-power switching transistor BD249 (T2) and...
Industrial timers are widely used in the industry for automatic controlling of electrical devices. Most timers available in the market are either complicated or poor in quality with unsatisfactory cost-to-performance ratio. This DIY industrial timer is panel-mountable and offers...
The 555 timer IC is used in a variety of timer, pulse generation and oscillator applications. It can be used to provide time delays, as oscillators and as flip-flop elements. The 555 timer IC is an integral part of...
Here is a small digital pulse tester that can be used to test and troubleshoot digital circuitry. The circuit is essentially a pulse generator activated by a single press-to-on switch (pushbutton). Momentarily pressing the pushbutton once generates a single...
In this circuit, an electrical signal is transmitted from one place to another riding over the laser beam.
Here is a battery charging indicator circuit of a simple charging monitor that indicates whether the storage battery of a solar power unit is being charged or not. It, however, does not tell the state of the solar panel. The...
This multi-utility flashlight consists of three sections: a flasher, a sound-to-light display and a white LED-based flashlight. Multi-utility flashlight circuit The flasher circuit is built around an NE555 timer IC that is wired as an astable multivibrator. It flashes a pair...
A water pump controller senses the level of water in a tank and drives the water pump. The circuit described here is built around timer IC1 (555). When the water level of the tank goes below the low level...
Wooden-case, battery-operated wall clocks with pendulums are available in the market. Some even have chimes. What is missing is the tick-tock sound of old mechanical pendulum clocks. Tick-tock sound generator circuit Shown above is the circuit of a tick-tock sound generator....
There are at least two popular applications of blinking a string of 110V/230V AC incandescent lamps. The first is audio-visual warning at construction sites or where repairing is going on. The second is to express joy and excitement during...