Content for PN2222A

PN2222A

The PN2222A is a common NPN bipolar junction transistor (BJT) used for general purpose low-power amplifying or switching applications. It is designed for low to medium current, low power, medium voltage, and can operate at moderately high speeds. he PN2222A is also a common replacement for the 2N2222 or 2N2222A NPN transistor.

Automated plants watering system

“Imagine a setup where technology integrates effortlessly with nature, allowing you to take control of your plant care routine. In the world of do-it-yourself (DIY) projects, few activities match the practicality of constructing your own Arduino-powered automatic watering system. Imagine …

FM Transmitter System Board

“In this project, we have designed an FM broadcasting transmitter system with a bandwidth of about 433MHz suitable for radio broadcasting. This is the simplest form of FM transmitter which has the capability of transferring broadcasted music or voice to …

Project  RF Listener

RF Listener

“So what is this thing? Basically it’s a handheld device that allows you to “hear” RF sources. Regular rf receivers single out a particular frequency and decode it into some type of information. This device on the other hand …

A digital quartz clock from scratch

“After 20+ years of programming, I wanted to get some understanding of the electronics that make my career possible. I had built the basic individual logic gates with transistors on a breadboard, but to build anything meaningful I needed loads …

Arduino Password Unlock Door Security System

“Hello! In this Instructables guide I will show you how to make your own password unlock door system by using the Arduino uno board. I made my own circuit by using the ATmega328 micro controller but this is an optional …

A 3.6V LiFePO4 charger for under 50c

“I like LiFePO4 batteries. They have a rather flat discharge at around 3.2V, which is ideal for powering 3.3V devices without a regulator. You can also use them in devices that take 2 standard AA cells by using …