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Electronics and communication engineering, explained calmly
Clear explainers, calculators and practice for ECE students everywhere, with a focus timer and a cat for company while you study. Free, no account needed.
Learn ECE, one question at a time
Worked explainers for every core ECE subject, from circuits to electromagnetics. Coming next: Verilog, verification, memory, RISC-V, GPUs, DSP, hardware security.
- Networks
- Electronic Devices
- Analog Circuits
- Digital Circuits
- Signals and Systems
- Control Systems
- Communications
- Electromagnetics
How Far Does the Fermi Level Move When You Dope Silicon?
Each tenfold rise in doping moves silicon's Fermi level by 59.5 mV, since EF − Ei = kT ln(ND/ni): 0.347 eV for 10¹⁶ donors. Worked numbers, limits and mistakes.
Why Does a Zener Diode Hold Its Voltage, and When Does It Stop?
In breakdown a Zener's current can swing widely while its voltage barely moves, but only above a minimum. A worked regulator design shows where it stops.
How Many Flip-Flops Does a Mod-N Counter Need?
A mod-N counter needs ⌈log₂N⌉ flip-flops: 4 for mod-10, 7 for mod-100. Why ripple counters pass through wrong counts on the way, and how to read them safely.
Build: calculators and tools
RC and RL time constant
Time constant, cutoff frequency and settling time of a first-order circuit.
dB conversions
Power and voltage ratios to and from dB, and mW to and from dBm.
VSWR and return loss
Converts between the reflection coefficient, VSWR and return loss.
Practice
Careers
GATE ECE
Preparing for GATE EC in India? Solved past papers, the 2027 dates and syllabus, and a score calculator.
Ready for GATE EC practice
4 solved GATE EC papers (2023 to 2026)Every question with the official answer and a worked solution.Topic-wise PYQs for 9 subjectsPast questions grouped by subject, newest paper first.9 formula sheetsEach formula with its symbols, units and a worked example.Free calculatorsGATE score, a practice virtual calculator and 5 ECE calculators.
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