Electronics Projects - Page 23 of 49

Servo Motor Tester Circuit Using 555 IC

March 22, 2017June 28, 2022 Engineeering Projects

I believe testing circuits are a must for project geeks since these testers save so much time in debugging circuits. People invest all their efforts and spend so much time completing one project but most of the time they don’t get the desired output. There can be multiple reasons behind this and generally, it is because the components like servo motors are at fault. The project Servo Motor Tester Circuit Using 555 IC was used in the project after isolating it from the project and helping us to detect if…

BLDC Motor Driver Circuit

March 21, 2017January 8, 2022 Engineeering Projects

After the BLDC motor driver circuit, had been introduced, its demand and use have increased past the mid- 20th century. Be it because of its flexibility that it can be converted into small size, or is it because it is much lighter than the conventional dc motor with brushes, the product is in the most preferred list of people. The device demands information about the rotor- position to set the favorable commutation angle. And, for this purpose, a Hall effect sensor is employed in the project. However, doing so can…

Listening Bug Circuit using op-amp LM386

March 17, 2017March 10, 2019 Engineeering Projects

Listening bug? What is that? Is it what strikes your head, the first time you see this title? Well, allow us to clear your confusion. Listening bug is a resemblance to that concept improves the quality of sound we hear. Input sound collected by the condenser microphone with high-sensitivity is supplied to the Listening Bug Circuit and adjustable sound gain is obtained at its output which improves the quality of sound for obvious reasons. Now, people can hear everything smoothly without risk of interruption and no talks will be missed.…

Car (Automobile) Battery Maintaining Circuit

March 11, 2017May 14, 2022 Engineeering Projects

Here is a simple circuit built around very common electronics components easily available in the local market which is used to protect car (automobile) batteries from deep discharge and also protect from getting damaged. Let’s get some facts about automobile batteries. We all know that battery itself has some self-discharge rate which depends upon battery capacity and the materials used to make it. Various reasons discharge a battery like an electrical installation in a car. When we do not use our automobile for a longer period the battery becomes fully…

DIY Hearing Aid Circuit using 555

March 8, 2017June 28, 2022 Engineeering Projects

The general circuit of Hearing Aid available over the internet used a normal transistorize circuit thus it consumes more power. So, here we are concentrated to design a circuit that consumes less power, DIY Hearing Aid Circuit using 555. For that, the circuit present here of DIY Hearing Aid Using 555 has an automatic triggering mode which consumes 96 mA at the time of amplifier trigger or you can say when sound is detected else it consumes only 6 mA which is very less. Other than less power consumption the…

Dual Polarity 5v from 9v Battery

February 28, 2017May 14, 2022 Engineeering Projects

Almost all electronic devices used in electronic circuits need a dc source of power to operate. The source of dc power is used to establish the dc operating point for the passive and active electronic devices in-corporate in the system. This day almost all circuits 5V regulated power supply but an operational amplifier requires a dual power supply (positive and negative) for proper operation, while we are using the battery power supply for a circuit then it would be difficult to get a dual polarity power supply. In order to…

Simple Battery Changeover Relay

February 24, 2017January 16, 2022 Engineeering Projects

circuit diagram of battery changeover relay

It is economical to use a battery eliminator but with frequent power failure in most developing countries, it becomes annoying to change over from battery eliminator to battery operation every time the electric supply fails. Thus, we had designed a simple battery changeover relay. A simple way to avoid the nuisance is by connecting the battery and power pack in parallel. But the advantage with such a system is that when the eliminator voltage falls, even slightly (say from 6V to 5V), though the performance of the set remains unaffected,…

Wireless Temperature and Humidity Indicator for Fridge

February 23, 2017September 14, 2018 Engineeering Projects

circuit diagram of receiver unit of wireless temperature and humidity indicator or fridge

There are various types of circuit used to indicate the temperature and humidity of fridge but it cannot measure relative humidity accurately. Because at the time of door opening of fridge relative humidity will rise or fall due to moister of surrounding. Thus, we had posted here “Wireless Temperature and Humidity Indicator for Fridge”. Here, we had posted a simple, small and handy wireless device which is used to measure temperature, humidity and relative humidity from inside the fridge. The circuit posted here used RF technology to transmit and receive…

Rotation Sensor using 555 IC

February 19, 2017June 28, 2022 Engineeering Projects

In this section, we discuss another application of the most popular IC, the 555 timers. Introduced in 1972 by the Signetics Corporation as a bipolar integrated circuit, the 555 is also available in CMOS technology and from several manufacturers. There are various projects we had already posted in the timer IC 555-based projects section. Now, we have come up with another interesting project called rotation sensor using the most popular IC of all time 555 Timer IC. When more conveyors or equipment are used in the processing system and anyone…

Zener Diode Tester Circuit

February 17, 2017January 28, 2022 Engineeering Projects

modified circuit diagram of zener diode tester

One of the most important uses of the zener diode is in making the constant voltage power supply. Its works are based on the fact that in the reverse breakdown (Zener) region, a small change in voltage across the zener diode produces a very large change in current through the circuit but the voltage across the Zener remains constant. In this article, we have posted two different circuits to test the zener diode i.e. general Zener diode tester circuit and modified Zener diode tester circuit Here, is a circuit that…

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