Discussion Overview
The discussion centers around the use of the circuit symbol "CR" as a reference designator for diodes in schematics, particularly its historical context and implications. Participants explore the evolution of rectifier technology, including crystal rectifiers, vacuum tubes, and semiconductor diodes.
Discussion Character
- Historical
- Technical explanation
- Conceptual clarification
Main Points Raised
- Some participants suggest that "CR" stands for crystal rectifier or current rectifier, indicating a historical reference to older rectifier technologies.
- Others note that "CR" has also been used to describe thyristors and triacs under the term "controlled rectifier."
- One participant expresses confusion about the timeline of rectifier technology, questioning the historical sequence from crystal rectifiers to vacuum tubes to modern semiconductors.
- Another participant provides details on the types of early solid-state rectifiers, mentioning point contact diodes and selenium rectifiers, and discusses the continued use of valve technology alongside semiconductors.
- A participant shares personal experience repairing antique radios, noting the use of the 35W4 tube and the transition to selenium rectifiers in newer models.
- There is a reflection on the perceived age of the radios, with a participant humorously commenting on their own age in relation to the devices.
- One participant speculates that the high failure rate of the 35W4 tube might have contributed to the switch to selenium rectifiers.
Areas of Agreement / Disagreement
Participants express various viewpoints on the historical context and terminology related to the "CR" designation, with no clear consensus on the specifics of the timeline or the implications of the term.
Contextual Notes
Participants reference various types of rectifiers and their applications, but the discussion does not resolve the uncertainties regarding the historical timeline or the definitions of terms used.