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Electronic Circuits
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  • 🏠 Home
  • 🔬 Projects
    • Audio Amplifier
      • Transistor Amplifier
      • Integrated Circuit Amplifier
    • Power Supply
      • Linear Power Supply
      • Switched Power Supply
    • Battery Chargers
    • Embedded System
      • Arduino
      • ESP32/ESP8266
      • Raspberry
      • Arduino Mini Course
    • RF Transmitters
  • 🖥️ CPD/IT
  • 🧰 Online Tools
    • Online Engineering Calculators and Tools for Professionals and Students
    • Resistor Color Code Calculator – 4, 5 and 6 Bands with Full Chart
    • SMD Resistor Calculator – Convert Codes to Ohms Instantly
    • Online HTML, CSS, and JavaScript Code Editor – Free!
    • Online Tone Generator – Sine, Square, Triangle, Sawtooth, Pink Noise and White Noise
    • Force Unit Converter – N, kgf, lbf, dyn and kp
    • LED Resistor Calculator – Find the Ideal Current-Limiting Resistor
    • Weight Unit Converter – mg, g, kg, lb, oz and Tons
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Electronic Circuits
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DIY TL072 Hi-Fi Preamp: Professional Build + PCB Layout

  • Electronic Circuits
  • 29/01/2026
  • Circuits to Assemble, Equalizer and Preamps

HI-FI Preamplifier Circuit with TL072 IC + PCB 🌐 You can read this article in: Português | Español Hello, electronics and high-quality audio enthusiasts!  Today we will dive into the fascinating world of HI-FI preamplifiers with a simple yet extremely…

Read MoreDIY TL072 Hi-Fi Preamp: Professional Build + PCB Layout
slmgr-command-windows

SLMGR on Windows: Practical Guide to Activation and Licensing

  • Electronic Circuits
  • 23/12/2025
  • CPD/IT, System Tools

Windows command line interface displaying SLMGR commands for license management. 🌐 You can read this article in: Português | Español Hello Everyone! Have you ever encountered Windows activation messages at the most inconvenient time? As an operating systems specialist with…

Read MoreSLMGR on Windows: Practical Guide to Activation and Licensing
diy-4-channel-mix-lm3900

4-Channel Audio Mixer with LM3900 (Full Project + PCB Layout)

  • Electronic Circuits
  • 20/12/2025
  • Circuits to Assemble, Equalizer and Preamps

4-Channel Audio Mixer with LM3900 + PCB 🌐 You can read this article in: Português | Español Hello Everyone! Today, we’re going to embark on a fascinating project: we’ll build an audio mixer circuit, functioning as a sound mixer with…

Read More4-Channel Audio Mixer with LM3900 (Full Project + PCB Layout)

ESP8266 vs ESP32 vs Arduino: Which One to Choose for Your IoT Project?

  • Electronic Circuits
  • 14/12/2025
  • Arduino, Embedded System, ESP32/ESP8266

Comparison of the three most popular microcontrollers for IoT projects 🌐 You can read this article in: Português | Español Hello Tech Enthusiasts! If you’re starting an Internet of Things (IoT) project, you’ve probably faced the question: ESP8266, ESP32, or…

Read MoreESP8266 vs ESP32 vs Arduino: Which One to Choose for Your IoT Project?

Build a Pro 10-LED VU Meter with LM3915: Ultimate DIY Guide + PCB

  • Electronic Circuits
  • 10/12/2025
  • Circuits to Assemble

VU Meter 10 LEDs using the LM3915 IC – Bargraph + PCB 🌐 You can read this article in: Português | Español Hello, electronics enthusiasts! Are you looking for a practical and visual way to monitor the audio level of…

Read MoreBuild a Pro 10-LED VU Meter with LM3915: Ultimate DIY Guide + PCB

3-Band Passive Equalizer: Complete DIY Project Guide + PCB

  • Electronic Circuits
  • 08/12/2025
  • Circuits to Assemble, Equalizer and Preamps

3-Band Passive Equalizer with Bass, Midrange and Treble Control + PCB 🌐 You can read this article in: Português | Español Hello, electronics enthusiasts and audio lovers! Today we’re going to dive into the fascinating world of audio equalizers with…

Read More3-Band Passive Equalizer: Complete DIY Project Guide + PCB
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