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FRDs (Fast Recovery Diodes) | Toshiba Electronic Devices ...
https://toshiba.semicon-storage.com/us/semiconductor/knowledge/e-learning/discrete/chap2/chap2-4.html
Rectifier diodes are used for low-frequency applications below 500 Hz, whereas FRDs are used for high-frequency switching from a few kHz to 100 kHz. Therefore, the reverse recovery time (t rr) of the diode characteristic, which is important for high-speed switching, is short. FRDs are also referred to as S-FRDs, HEDs, etc. according to the trr value.
audio lecture 23, why ultra fast recovery diodes?, silicon ...
https://www.youtube.com/watch?v=E9eGRPPFrYs
UF diodes reduce AC noise a little bit because they have very fast recovery time. We use silicon diodes when we design tube amplifiers for rectifier circuit. UF diodes reduce AC noise a little bit...
Fast Recovery rectifier diodes | Page 2 | diyAudio
https://www.diyaudio.com/community/threads/fast-recovery-rectifier-diodes.66542/page-2
In mains rectification that is no advantage at all. In fact, the fast switching is a disadvantage because the switch-off current cut-off generates lots of hf signal bursts that get into the supply and can muddle the audio. However, if you have a soft-recovery diode, then the hf is much less because the switch-off is very gradual.
What are Fast Recovery Diodes (FRD)? | Semiconductor ...
https://www.shindengen.com/products/semi/column/basic/diodes/frd.html
These diodes are designed for commercial frequencies, such as 50/60 Hz, and are not used on a switching circuit. FRD FRD stands for fast recovery diodes. They offer high-speed support and generally have a trr of approximately 50 to 100 ns. With a V F of approximately 1.5 V, it is rather large when compared to general rectifying diodes.
Rectifiers | DIY-Audio-Heaven
https://diyaudioheaven.wordpress.com/tutorials/power-supplies/rectifiers/
ultra fast soft recovery diodes in bridge rectifiers with AC at 50/60 Hz. There is debate about the relevance of this and if the use of these diodes help improve sound quality in audio applications. A subjective view point of improved sound quality is not to be dismissed.
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