IMHO, even your first image has too much noise for this regulator; might be from your scope probes. Also, you have to be very careful what capacitors you use at Vout. You might want to try removing all those smd caps, and just use one larger size electrolytic, and test it first with a resistor load.
Salas,
The strange thing is the sound did improved on 1.2R. There is no sign of resolution loss, noise or anything. I suspect my previous power supply may have this problem, I just didn't notice before. I will switch back to old PS tonight and see how it goes, thanks.
The strange thing is the sound did improved on 1.2R. There is no sign of resolution loss, noise or anything. I suspect my previous power supply may have this problem, I just didn't notice before. I will switch back to old PS tonight and see how it goes, thanks.
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Salas,
The old PS has been re-installed. Still, the problem remains, so the cause is clearly not 1.2R. This is beyond my knowledge, I wish someone could show me some directions. I've tried several combinations of bypass technique without any sign of relief. Anyhow, 1.2R is definitely a great PS for digital. A big improvement over my previous PS.
The old PS has been re-installed. Still, the problem remains, so the cause is clearly not 1.2R. This is beyond my knowledge, I wish someone could show me some directions. I've tried several combinations of bypass technique without any sign of relief. Anyhow, 1.2R is definitely a great PS for digital. A big improvement over my previous PS.
Supply_decoupling.pdf and a tons of other good articles can be found with Google
Here's another Bob Pease pearl that might be of help:
Bob Pease describes circuit solutions that solve common-mode noise problems.
Bob Pease describes circuit solutions that solve common-mode noise problems.
hello
i have this regulator Salas shunt reg. +5V to +3.3V modificaton - My Photo Gallery
i want to get from it 300ma.what value should r1 have? do i need to do other modifications?
i want to use it to power some digital circuits
thanks
i have this regulator Salas shunt reg. +5V to +3.3V modificaton - My Photo Gallery
i want to get from it 300ma.what value should r1 have? do i need to do other modifications?
i want to use it to power some digital circuits
thanks
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