A circuit: [describe].
Explain block by block: what
each section is for, what the
non-obvious components do, and
which part is the first suspect
if it fails.

Explain a Schematic Block by Block

Block by block, ending with the first thing to suspect.

Prompt

Here's a circuit: [describe or paste it]. Explain it block by block — what each section is for, what the non-obvious components are doing, and which part would be the first suspect if it stopped working.