EC-19.5 The Design Cycle, and a First Build That Works
You can run one complete design cycle on something small — need, requirement, diagram, build, test, revise — and say honestly whether the result met what you wrote down at the start.
Before:nothing requiredUnlocks:PE1-4. Embedded C ProgrammingEC-13. Laboratory Practice, in Sequence
The value of this topic is finishing something. A reader who has completed one small build has a reference point for every abstraction that follows, and knows from experience that the first version does not work and that this is normal rather than a verdict on them. The engineering design course later formalises the same loop with reviews and verification; the board course later assumes you have already wired something up.
Work through these
The cycle: understand, propose, build, test, revise
Design is a loop rather than a line, and going round it twice quickly beats going round it once carefully. The step people skip is the first one, and skipping it is what produces a working device that solves the wrong problem.
NPTEL: Product Design and Development (IIT Roorkee) · CourseChoosing a first project small enough to actually finish
A good first build has three or four components, one clear behaviour and no part that has to be ordered from far away. Ambition at this stage produces an unfinished box rather than a lesson.
NPTEL: Electronics Equipment Integration and Prototype Building (IISc Bangalore) · CourseFrom a block diagram to a circuit you can put on a breadboard
Each block becomes a small group of components, and the arrows become wires carrying a voltage between them. Doing this once by hand is what connects the abstract diagram to the physical object.
Building it, and testing each block before the whole
Powering one block at a time and checking it behaves before adding the next turns one impossible fault into several findable ones. This is the single habit that most separates a build that comes together from one that does not.
NPTEL: Electronics Equipment Integration and Prototype Building (IISc Bangalore) · CourseWhen it does not work: dividing the problem in half
Measuring at the middle of a signal path says which half the fault is in, and repeating that finds it in a few steps. Guessing at the likely culprit and replacing parts is slower and teaches nothing.
NPTEL: Electronic Systems Design — Hands-on Circuits and PCB Design with CAD Software (IIT Delhi) · CourseWriting down what it does, what it cost, and what you would change
A short honest record of the finished build, checked against the one-page brief, is the point at which the cycle closes. Naming the one thing you would do differently is what carries forward into the next build.
NPTEL: Product Design and Development (IIT Roorkee) · Course
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- FreeNPTEL / IIT Roorkee · CourseNPTEL: Product Design and Development (IIT Roorkee)
- FreeNPTEL / IISc Bangalore · CourseNPTEL: Electronics Equipment Integration and Prototype Building (IISc Bangalore)
- FreeNPTEL / IIT Delhi · CourseNPTEL: Electronic Systems Design — Hands-on Circuits and PCB Design with CAD Software (IIT Delhi)
Links last checked 4 Sept 2026.
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