Build a low cost wifi repeater with NodeMCU

We are in the age of the Internet of Things (IoT)! Today, you can remotely control your home gadgets/devices like air conditioners, room heaters, water heaters, etc. from anywhere, and can easily build or buy off-the-shelf appliances. For every Wi-Fi based IoT enabled device, you need an internet connection, or you can say an uninterrupted […]

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Introduction to the TL074 operational amplifier

An operational amplifier is an integrated circuit whose main function is to enhance weak electrical signals. Typically, an op amp consists of two inputs and one output. The op amp amplifies the signal and creates a voltage difference between the two inputs. There are different types of op amp ICs on the market depending on […]

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8051 Microcontroller Pin Description and Basic Circuit

The basics of the 8051 microcontroller have been covered previously, including its history, features, packaging, and some practical applications. In this article, the editor will continue to introduce the 8051 microcontroller pin diagram, pin description and other details, including the basic circuit of the 8051 microcontroller. Of course, it will be easier to understand the […]

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How to Build a 555 Timer Based Siren Circuit

After hearing the sirens of a nearby police car, one might wonder how the tone came about. You'll be surprised to learn that the brains behind these tones are not microcontrollers, but the humble NE555 timer IC. If you know anything about electronics, you must have heard of the 555 timer IC and its 3 […]

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Build a Line Following Robot Without Using a Microcontroller

A line following robot (LFR) is a machine that follows a line, which may be a black line or a white line. The follower bot is beginner friendly and easy to understand and build. While line follower robots are popular and common to build with Arduino or other microcontrollers, let's try to build the same […]

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Introduction to the pins and functions of 80C51 single chip microcomputer

First, let’s connect the pin diagram of the single chip microcomputer. If so, the specific functions are introduced below. 1. Power supply: ⑴ VCC – chip power supply, connected to + 5V; (2) VSS – grounding terminal; 2. Clock: xtal1, xtal2 – inverting input and output of crystal oscillation circuit. 3. Control line: there are […]

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Component constants related to VCC pin of power IC

This paper will determine the VCC pin related component constants of the power IC used in this design. VCC pin is the power pin of power IC bd7682fj. The internal control circuit of bd7682fj works by applying voltage to VCC pin. As we all know, if the input voltage of this power supply circuit is […]

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