# All Circuits and Electronics

Circuits Geek is a free resource online portal with tutorials on various concepts related to Electronics. Yon can also find various mini-projects and guides which you can try yourself. Use Advanced Search tool to search for the tutorial or projects you want to try out.

### Arduino based Hand Gesture Control of Your Computer

You might have seen Hand Gesture Controlled Robots, where the motion of a robot is controlled by the gestures of the hand. Another interesting project based on a similar principle

### Sallen and Key Filter

The Sallen and Key Filter design is a second-order active filter topology which we can use as the basic building blocks for implementing higher order filter circuits, such as low-pass (LPF), high-pass

### Digital Comparator

Digital or Binary Comparators are made up from standard AND, NOR and NOT gates that compare the digital signals present at their input terminals and produce an output depending upon the condition of those inputs.

### How to Burn Bootloader on ATmega328 using Arduino UNO?

In this project, I will show you how to burn bootloader on ATmega328 Microcontroller. Using this method, you can use your ATmega328 Microcontroller as a standalone on a custom design

### MOD Counters

The job of a counter is to count by advancing the contents of the counter by one count with each clock pulse. Counters which advance their sequence of numbers or

### Passive Low Pass Filter

In other words they “filter-out” unwanted signals and an ideal filter will separate and pass sinusoidal input signals based upon their frequency. In low frequency applications (up to 100kHz), passive

### Resistor Colour Code

There are many different types of Resistor available which can be used in both electrical and electronic circuits to control the flow of current or to produce a voltage drop in many

### Electrical Waveforms

In the Oscillators  tutorials we saw that an oscillator is an electronic circuit used to generate a continuous output signal. Generally this output signal is in the form of a sinusoid at

### Operational Amplifier Building Blocks

We have seen that we can connect resistors to a basic operational amplifier to produce various inverting and non-inverting outputs and configurations along with their respective gains. So to make

### Butterworth Filter Design

In applications that use filters to shape the frequency spectrum of a signal such as in communications or control systems, the shape or width of the roll-off also called the