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Old 24th July 2009, 04:30 AM   #101
Stuey is offline Stuey  Australia
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...so the medical one is better for audio in hospitals.
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Old 24th July 2009, 05:28 AM   #102
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Of course. The other must not be used there and no audio is bad audio.
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Old 24th July 2009, 07:25 AM   #103
infinia is offline infinia  United States
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Quote:
Originally posted by PJPro
Errr. Anyone know the difference between a standard and medical filtered module? They're about the same price. Is one better for audio?
Hospital grade means it has specs on low leakage currents returning to earth. So for them, they simply omit all the Y caps, since AC currents normally flow there. The non hospital grade actually filter much better. These filters are directional, so by adding your own extra Y caps is even better for filtering stuff from getting inside vs out.

compare diagrams page 12 http://www.schurter.ch/pdf/english/G...nformation.pdf
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Old 24th July 2009, 10:00 AM   #104
AndrewT is offline AndrewT  Scotland
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Infinia,
you forgot that some folk refuse to read.
Worse they expect to be spoon fed.
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Old 24th July 2009, 06:22 PM   #105
PJPro is offline PJPro  England
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I took a look at that data sheet last night, unfortunately before your post infinia. I was unable to arrive at the same conclusion as you....and went with the medical filters. These have now been shipped.
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Old 24th July 2009, 06:34 PM   #106
PJPro is offline PJPro  England
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Quote:
Originally posted by AndrewT
Infinia,
you forgot that some folk refuse to read.
Worse they expect to be spoon fed.
I'm really grateful for any help, advice or words of wisdom people are prepared to offer to help me through this first build. If people don't want to help, then please refrain from posting.
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Old 24th July 2009, 06:46 PM   #107
PJPro is offline PJPro  England
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Quote:
Originally posted by infinia


Hospital grade means it has specs on low leakage currents returning to earth. So for them, they simply omit all the Y caps, since AC currents normally flow there. The non hospital grade actually filter much better. These filters are directional, so by adding your own extra Y caps is even better for filtering stuff from getting inside vs out.

compare diagrams page 12 http://www.schurter.ch/pdf/english/G...nformation.pdf
You are saying that I can place a couple of caps from live and neutral to earth to replace these Y caps? I notice that the M80 variant of the medical filter is supplied with these caps.

If I were to replace the Y caps, how do I go about working out the capacitance required?
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Old 24th July 2009, 07:09 PM   #108
infinia is offline infinia  United States
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Depends on what frequencies you are trying to reject. More C is better until the case size gets to big and the SRF gets in the way. So start with 2200 pF and maybe more staying with that case size no bigger. Mount directly to output pins with the leads trimmed short etc.
Which part did you order? those IEC input filters are really expensive, I use usually scavenge whatever I come across.
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Old 24th July 2009, 07:12 PM   #109
PJPro is offline PJPro  England
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Am I gonna be able to get my faston connectors onto the lugs if I have caps soldered on?
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Old 24th July 2009, 07:16 PM   #110
infinia is offline infinia  United States
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You can work it out I'm sure, if not maybe you can try to change your order to get the right IEC filter part.
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