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In Reply to: RE: You may be posted by beppe61 on June 09, 2016 at 00:23:23
With that power supply, there is an instability issue in the MHz range. Basically, to get rid of most of it, you will need to decouple the power supply pins of the NE chip with 0.1uF npo ceramics and a 4.7u PP cap across the power pins.This occurs not only on one, but three units. You'll need a wide band scope to see all this clearly and also put the unit on load to make sure.
Edits: 06/09/16Follow Ups:
"With that power supply, there is an instability issue in the MHz range."
Without you providing supporting evidence for your bold proclamations they cannot be useful to anyone.
You will need to provide evidence of your findings for them to be taken seriously.
Who do you think you are? Don't believe me and buy one of these.
Hmm. The exact same answer someone who was trying to hide the fact they have absolutely no clue might have given....Hmm
Yeah, who do you think you are anyway? Everyone here makes purchasing and modification decisions based on posts by internet buffoons. What's wrong with you?!
Hi thanks a lot for the very kind and precious advice
I think I will be able to do what you recommend
I can only see noise floor up to 48kHz
Are you aware of very good 12V/2A psu
maybe?
Kind regards,
bg
Edits: 06/09/16
It'll cost you bought : ie Paul Hynes.
But you can make one from the ALW version of the superregultor (with heatsinking) or use a Bellioson ready made unit (with heatsink). The former needs quite a lot of work.
Thanks a lot again for the helpful advice.Usually i see in the specifications noise figures given up to 100 kHz.
I wonder what kind of issues noise located above 100kHz (i.e. in the MHz region) can cause.
Some clock irregularity/instability maybe ?
with my current set-up i can only check the noise floor up to 48kHz (using 96k sampling rate)I looked at the usual regulator chips and as you said before they are quite uneffective at suppressing higher Hz noise.
There are some a little better but kits using them are very rare.
I will look for the brands you mention.
In the meantime have found the Belleson site.
Thanks a lot again.
Kind regards,
bg
Edits: 06/09/16 06/10/16 06/10/16
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