8.1 Reading a device schematic by blocks

I declare: solidlikelyshaky

1. On a commercial schematic (an amp, a charger), circle the blocks and name them before reading a single component.
2. Follow the signal path from input to output and the power path from the plug to each stage, in pencil.
3. Read a service schematic’s conventions: named rails, multiple grounds, reference voltages, connectors between sheets.
4. Recognize at sight the canonical topologies (differential pair, current mirror, push-pull, series regulator, H-bridge) because they come back everywhere.
5. Summarize a device in a one-page block diagram, and say what each block requires of its neighbour.
6. Diagnosis: a schematic you don’t understand, find the ground and the rails first, then the big capacitors, then the output transistor; the rest falls into place around them.