Electro Stimulation Ward > Power Conditioning

Fo-Felix EMI Filter for AC mains 120/230v

<< < (3/3)

rollo:
  Do you have any before and after measurements to support EMI and common mode noise reduction ? What is total cost without labor ?


charles

Folsom:
I could produce a few measurements. But I warn you that graphs on power conditioners are to be taken with a grain of salt. The AC system is so complex that you can’t model or measure infinitely in one go, so you end up with something that may be a very different measurement from any other possibilities in any other stereos. So the secret is to understand what the AC types of noises and behavior are, rather than specific ones.

But really if you want to make it simple a reactance calculator will give you an approximate idea of how much noise it is possible to do some attenuation on. Just remember the caps are first so their impedance isn’t high per se, compared to the inductor.

To be even more simple about it, there is no mystery whether or not CMC’s work. But there are some gentle differences that become rather big when you’re listening, comparing filters like the original and mine. Did you see the difference in using a bunch of cap values and a single value? Turns out multiple values doesn’t hold the desires people want, as the differences in settling times makes everything screwy.

I don’t have a cost without labor for PCBs. If you mean the one-off, well that depends, are you wondering the price of one-offs or of multiples? I can assure you I don’t typically not charge any labor (or markup, I’m not an altruistic billionaire). One-offs take a surprising amount of time between all the parts, assembly, enclosure planning, tooling, etc.

If you want to DIY the board+connector was $13ea and CMC’s range from $8-12 or so each, caps $1~, resistors $2~, fuse stuff $1~. Other prices for parts are fairly common. Building your own is by far the most cost effective thing you can do - but that is really only something that people who won’t by commercial are willing to do.

rollo:
  Thanks for the answer answer. I hear a difference when using different power conditioners. Some it is tonality, others sound stage, others a non linear sound. They range in cost from $200 to 10K.
  Isolation transformers were the worst offenders sonic wise. Even the Promithius a custom wound and designed for audio produced a forward sound. The Richard Gray was bright. Have not tried a Blue Circle Isolation Transformer yet.
  The best result was using 3 dedicated lines off a sub panel with individual conditioners on each line. Separating the mono blocks and digital proved best. The sound was restricted using one dedicated line and one conditioner.
  This can get expensive fast if using mono block amps and dual mono preamp. Three digital sources as well.


charles

Folsom:
Now on GB #5!!!

P.I.:
Cool!   :thumb:

Navigation

[0] Message Index

[*] Previous page