ufelectronics.eu

BJT Transistor Amplifier Calculator

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by

Andrew
in

The last month, I’ve released the BJT Transistor Amplifier Calculator under this link: https://ufelectronics.eu/bjt_amp_calculator.

Below you can see some screenshots, head for a intro video on Youtube, or join a chat about it on Discord.

Screenshots

Screenshots from the Calculator

Intro video on Youtube

A updated video introduction can be seen on Youtube: https://youtu.be/F6OxV1kNuMo?si=Z-4_lQc3cDVW5_VD

Discord

Join the discussion in Discord: https://discord.com/channels/1373552306817339535/1373552494831206420

Add feedback and suggestions

Leave comments and feedback on both channels, or y by using the Contact form.

Design smarter, faster, and better transistor amplifiers – right from your browser.

The Transistor Amplifier Calculator is a powerful free online tool designed to simplify and accelerate the process of designing single-stage transistor amplifiers, including common emitter, common collector, and Class AB power amplifiers. Whether you’re a student, hobbyist, electronics educator, or hardware engineer, this tool gives you deep insight and practical output—instantly.

🔧 Key Features

  • Amplifier Configuration Support: Choose between Common Emitter (CE), Common Collector (CC), or Class AB push-pull amplifier types.
  • Smart Parameter Inputs: Set your preferred design constraint—target voltage gain, emitter voltage, or collector voltage symmetry.
  • Realistic Transistor Models: Choose from multiple real-world BJTs (e.g., 2N3904, BC517, 2N2222) with parasitic capacitances or use an idealized generic model.
  • Dynamic Resistor & Capacitor Calculations: Automatically computes values like R1, R2, Rc, Re, and Cin/Cout/Cbypass to match standard resistor series (E12, E24, or E96).
  • Interactive Graphs: Gain plot, signal swing plot, and transistor output characteristics visualized for clearer understanding.
  • Component Suggestion & Export: Outputs nearest standard component values and allows exporting results as CSV, XML, or clipboard copy for use in documentation or spreadsheets.
  • Live Schematic Preview: View the circuit schematic based on your amplifier type with an option to zoom in.
  • Built-in Formula Breakdown: Displays all calculations using LaTeX formulas for transparency and learning.
  • Dark/Light Mode + Zoom Controls: Optimized for usability and accessibility in any environment.

👤 Who Is It For?

  • Electronics Students & Learners: Ideal for understanding the impact of transistor characteristics on amplifier design.
  • DIY Audio Builders & Hobbyists: Design audio-frequency amplifiers for guitars, radios, and more without math headaches.
  • STEM Teachers & Educators: A perfect tool for classroom demonstrations or lab prep.
  • Prototypers & Engineers: Fast prototyping support with accurate and exportable data.

✅ Benefits & Value

  • Saves Hours of Design Time: Automatically does the heavy lifting of calculating key values and matching standard components.
  • Educational Insight: See how every parameter affects circuit behavior—great for building intuition.
  • Practical Realism: With real-world transistor models and output impedance/gain/swing calculations, it’s not just theoretical—it’s ready for the workbench.
  • Flexible & Shareable: Perfect for documentation, student reports, or collaborative development.

🎓 Designed and maintained by UFElectronics.eu, this calculator is freely available and actively developed with user feedback. Watch the tutorial video, experiment with real-world scenarios, and level up your analog design skills.

Try it today: https://ufelectronics.eu/bjt_amp_calculator