MD-04 · Chapter 11 · Measurement, Debug & Failure Analysis
Bench debug: a silent buzzer oscillator
On the bench is a small board with a Schmitt-trigger inverter RC oscillator meant to drive a buzzer at about 2 kHz. It's silent. You have the schematic and a scope. Find the fault, predict the frequency and measure it.
| Level | ●● onsite technical |
| Track | General board |
| Really testing | Method, sanity checks, scope fluency. |
Full worked answer: in the book, page 270 — what to say first, how to explain it, the numbers worth quoting and the follow-ups. About the book →
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