# 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.

### DeMorgan’s Theorem

As we have seen previously, Boolean Algebra uses a set of laws and rules to define the operation of a digital logic circuit with “0’s” and “1’s” being used to

### MOSFET Amplifier

In our previous tutorial about FET amplifiers, we saw that simple single stage amplifiers can be made using junction field effect transistors, or JFET’s. But there are other types of

### Relay Switch Circuit

The advantage of relays is that it takes a relatively small amount of power to operate the relay coil, but the relay itself can be used to control motors, heaters,

### The Demultiplexer

The data distributor, known more commonly as a Demultiplexer or “Demux” for short, is the exact opposite of the Multiplexer we saw in the previous tutorial. The demultiplexer takes one single input data line

### Arduino based Door Monitoring System using Reed Switch

In this DIY Project, I will show you how to design a simple Arduino based Door Monitoring system using Reed Switch. A Door Monitoring System is a simple application which

### Interfacing 16×2 LCD with Raspberry Pi

In the previous project of the Raspberry Pi Series, I have shown you how to blink an LED using Raspberry Pi and Python Program. Moving forward in the series, in

### Interfacing Stepper Motor with STM32F103C8T6

In this tutorial, I will show you the procedure for Interfacing Stepper Motor with STM32F103C8T6 MCU based STM32 Blue Pill Board. I will first give a brief overview of the

### Transistor Biasing

The steady state operation of a transistor depends a great deal on its base current, collector voltage, and collector current values and therefore, if the transistor is to operate correctly

### Simple LED Flasher

The electronics student or hobbyist’s always likes to make various circuits for their home or school and especially ones that flashes a few lights, and there are many circuits and

### Harmonics

In an AC circuit, a resistance behaves in exactly the same way as it does in a DC circuit. That is, the current flowing through the resistance is proportional to

### Binary Decoder

The name “Decoder” means to translate or decode coded information from one format into another, so a binary decoder transforms “n” binary input signals into an equivalent code using 2n outputs.

### The Electromagnet

We now know from the previous tutorials that a straight current carrying conductor produces a circular magnetic field around itself at all points along its length and that the direction