Can anyone give me some advice on how much ripple will be tolerable with my AlephX? My speakers are fairly efficient- about 92db/1W.
Can someone tell me how quiet their design is, and what kind of ripple they are seeing on the power supply rails? I'm trying to squeeze the last bit of voltage out of my supply by cutting down on the size of the coil in my pi filter, but I don't want to have a hum problem.
Thanks.
-NS
Can someone tell me how quiet their design is, and what kind of ripple they are seeing on the power supply rails? I'm trying to squeeze the last bit of voltage out of my supply by cutting down on the size of the coil in my pi filter, but I don't want to have a hum problem.
Thanks.
-NS
The unfiltered supply in something like an XA160 is 600 mV peak to peak, and the filtered voltage is about 1/10 that. This is adequate to get down into the 200-300 microvolt output range for total output noise with 30 dB gain.
Unfortunately it will not reduce overall noise by much more,
but it's welcome anyway. The next step would be to get the
transformer at a several foot distance.
but it's welcome anyway. The next step would be to get the
transformer at a several foot distance.
Nelson Pass said:
That is one thing that I am very worried about- I am using cheap surplus EI core transformers, and I still don't know which way is the best as far as orientation goes. I was going to lay them on their sides and orient them so that their windings are perpendicular to the output devices, which will be mounted much higher. The input stage pcb will be mounted roughly parallel to the core/frame, at as big of a distance horizontally as I can get, but in the same vertical plane (I'm hoping that the tranformer radiation pattern is something of a figure 8, and that keeping the input board inline with the frame will put it at a "null" point). Will this work, or do you have a better idea for me?
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