Electronic is fun to learn, especially if you can learn it by building your own circuits. To help you with that, Circuit Digest provides you with a list of popular Electronic circuits and Electronic projects with well illustrated circuit diagram and detailed explanation for a complete do-it-yourself experience. All projects are tested and verified with a working video for a hassle free learning experience. Whether you are an expert or beginner in electronics, we have something interesting for all of you. Below is our huge collection of 200+ free electronic circuits that you can build today.
Most of the Analog Electronic circuits require dual power supply rails for proper balanced operation; this gets especially critical if we are designing Operational amplifier circuits. Negative supply voltage is also required in digital systems like A/D converters, op amps and comparators. In all these cases, the current requirement will be low, but generating such a -5V…
Relays are frequently used in our electronics applications specially when we need to drive high loads from microcontroller circuits. So in this DIY project, we make a 4-Channel Relay Driver Circuit to be used in relay based applications. In-here we have designed an isolated PCB for 4 relays to operate 4 AC appliances at a time. We have put a three pin screw terminal…
The simple current source is not perfect for variable loads as the current through load also changes with the load resistance. The solution for this problem is a Constant current source like Howland Current Pump Circuit.
The Howland Current Pump was invented in 1962 by Professor Bradford Howland from MIT. It consists of an operational amplifier IC…
In the previous tutorials, we demonstrated detailed design of 3.7V to 5V Boost Converter using MC34063 and 12V to 5V Buck Converter using MC34063. Today we will use the same MC34063 IC to build a DC to DC Boost Converter circuit which can convert small voltage like 3v to higher voltage upto 40v. So here MC34063 IC is used a Adjustable DC-DC Converter.
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Light fence circuit is used to detect the presence of any human or object in a particular area. The detecting range of Light Fence Circuit is about 1.5 to 3 meters. It’s quite simple to design the circuit using LDR and Op-amp. This portable circuit can work smoothly with a commonly available 9V battery and the alarm sound generated from the buzzer is loud enough to detect…
The Great American Businessman and Inventor of light bulb – Thomas Alva Edison once said that “We will make electricity so cheap that only the rich will burn candles”, which certainly has become the case today. From small house to paved roads to big industries, we can notice AC lights illuminating our environment after the sun goes down. Earlier lighting systems employed…
We can consider the Volume Meter as an Equalizer, which is present in the Music systems. In which we can see the dancing of lights (LEDs) according to the music, if the music is loud, equalizer reaches to its peak and in low music it remains Low. We have also built a Volume Meter or VU meter, with the help of MIC, OP-AMP and LM3914, which glows the LEDs as per strength of…
Every Electronic device or product requires a reliable power supply unit (PSU) to operate it. Almost all devices in our home, like TV, Printer, Music Player etc. consists of a power supply unit built into it which converts the AC mains voltage to a suitable level of DC voltage for them to operate. The most commonly used of type of power supply circuit is the SMPS (Switching…
Flashlight or Torch is very useful in emergency situations like power failure. These flashlights are battery-operated, and we have to charge regularly in particular intervals. But what if you don’t have electricity and your flashlight is dead? In that situation, Mechanical chargeable Flashlights is very good option, which can be charge by rotating the lever attached to it.…
A latch circuit can ‘hold’ the circuit in either on or off state until any external signal is applied to it. Latch circuit retains its position (either on or off) even after the input signal is removed and can store one bit of information as long as the device is powered. For active high signal, it stores one, and for active low signal, it stores zero.
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Capacitors seem all fine till you get to the point where a power supply fails or refuses to perform optimally. And if the problem is noise, there is a simple fix, you just add more capacitors. But that does not solve it. What could be wrong?
The problem arises from the naïve assumption that capacitors (to a large extent) are ‘ideal’ devices, while…
Candles have been of great use since ages, it has been guiding humans during night even before Edison came up with the idea for bulbs. Today, from Churches to kitchens, Candles are used not only to provide light when needed but also adds up to the aesthetics and provides a warm feeling. While ordinary candles work fine, they melt away pretty fast making the place nasty and…
