Engineers Garage
 
A EE World Online Resource
April 24, 2025
 
 
Audio Filters: Understanding sound waves – Part 1
Audio circuits process and manipulate electrical signals for sound, performing functions like filtering, mixing, and amplifying. This series covers three designs: audio crossover, equalizer, and mixer circuits.
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What to look for in a BJT transistor datasheet
A bipolar junction transistor is characterized by several specifications. Whether you are looking for a transistor to use as a switch or an amplifier, the transistor specifications must match the circuit requirements.
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IoT-based heart rate monitoring system
In this project, we are going to make a heartbeat monitor system that will be able to send the readings in bpm to the doctor directly through the internet using the MQTT protocol from anywhere in the world.
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Audio Filters: The working and classification of microphones – Part 3
Microphones convert sound waves into electrical signals using various technologies: dynamic (coil-magnet), condenser (charged plates), ribbon (metallic strip), and crystal (piezoelectric). They feature different directional patterns including omnidirectional, bidirectional, and cardioid for various applications.
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EDITOR'S CHOICE
 
A Designer’s Guide to IOT
Learning Guide to IoT A learning guide for IoT (Internet of Things) will help understand the basic concepts, tools, technologies, and steps involved in building IoT solutions. Here’s a step-by-step guide to help you navigate through the different aspects of IoT: Introduction to IoT Definition: IoT refers to a network of physical devices, vehicles, appliances,…
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A guide to bipolar junction transistors
Bipolar junction transistors (BJT) are three-terminal semiconductor devices that function as amplifiers or switches. They come in NPN and PNP types, operating in active, saturation, or cutoff regions for various applications including signal amplification, power control, and digital electronics.
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Cell Phone Controlled Robot Without Microcontroller: Step by Step Guide
Cell phone-operated robot moves in different directions based on phone keypad input, using DTMF technology to receive commands remotely through a mobile call within the service provider's coverage area.
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