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In Reply to: RE: Cree shottky in HV . posted by Wojciech on March 28, 2015 at 06:45:43
Here , I found a comment by Neff from one of his postings
..." I experimented with Cree no noise diodes, but as advised by others now use simple UF4007 diodes..."
????
What others? and why they advised against Cree diodes ? Almost all I read on this board is that Cree is next best thing to sliced bread , hmmm
Follow Ups:
The diodes are just one piece of the power supply. It almost sounds like you have an ultrasonic oscillation if you are getting annoying sibilance. Sometimes changing parts will make a marginally stable circuit become unstable. Bad sound from diodes comes from the noise they are injecting and radiating. How close are the diodes physically to your signal section? Try using a hash choke.
The proximity of PSU to signal circuit is a no issue . But you're right , I have to check for ultrasonic junk. The effect is subtle but rather annoying so I didn't think it might be a sign of instability.
Thanks!!
You would be surprised. Oscillations at Mhz or Ghz have a range if impacts. If you are hearing something annoying, there will be crap riding on your B+ rail. Cree Schottky diodes don't produce ultrasonic crap from switching noise on their own, this is why they are good.One thing to look for since the advent of lead free parts are solder joints that look good, but are not. I have run into solder joints that look perfect in every way, that were ultimately bad. Very hard to track down. If your solder joints on your Crees are not perfect, they will transmit junk.
Edits: 03/29/15
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