Advanced Qualification · A-002 Advanced components and circuits · A-002-005-008
In amateur radio equipment, which is the major application for the silicon controlled rectifier (SCR)?
- A Power supply overvoltage "crowbar" circuit
- B Class
- C Microphone preamplifier circuit
- D SWR detector circuit
Correct answer: A — Power supply overvoltage "crowbar" circuit. From the official ISED question bank, verified word for word.
Why
A silicon controlled rectifier acts like a one-way valve that, once triggered, stays open until power is cut. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.