Learn the circuits. Design the systems.

Five free engineering tools from Cursory Solutions, covering electronics and electrical power: a reference library of 142 electronic circuits, SMPS converter filter calculators, an induction motor design calculator, power-system single-line diagrams with AC state estimation, and 7 engineering textbooks in Urdu. Everything is free and runs in the browser.

Circuits

Browse, search and study electronic circuits — schematics, PCB layouts, hex files, firmware source code and bills of materials, across embedded, digital and analog electronics.

SMPS filter design

Calculators for the common switch-mode power supply topologies — asynchronous and synchronous buck, boost, inverting buck-boost, Cuk, SEPIC, Zeta and flyback. Enter your voltages, current, switching frequency and ripple targets to get inductor, capacitor and transformer values as you type.

Induction motor design

Stator sizing for a three-phase induction motor: poles, output coefficient, bore diameter and stack length, flux per pole, winding and distribution factors, turns per phase, slot and tooth geometry, yoke thickness and air-gap MMF — each shown with the formula behind it.

Power system diagrams & state estimation

Load an IEEE Common Data Format case to draw an interactive single-line diagram, or add a measurement file and run a full AC weighted-least-squares state estimator: Y-bus assembly, observability analysis by SVD rank, Gauss–Newton iteration, and chi-squared and largest-normalised-residual bad-data detection.

Urdu engineering books

Free Electrical and Electronics engineering textbooks written in Urdu by Khalid Khan Yousaf Zai, covering electronics, electric machines, digital circuits, electromagnetics, circuit analysis, engineering mathematics and calculus — readable online chapter by chapter.