First Lm3886 - Page 12

PJPro · 24th July 2009, 07:25 PM

Unfortunately, the goods have left the US and are at Stanstead (UK).

My solution would be to solder one lead of each cap onto the wires coming from the transformer and the other lead onto the earth wire. I'd then place these soldered ends into the crimps.

Is this regarded as a pucker solution?

infinia · 24th July 2009, 07:35 PM

If it were my call (RF design guy) I would solder the caps real close to the filter case and dress it down so there's still room for the faston. Or just solder everything and ditch the faston.

PJPro · 24th July 2009, 08:01 PM

Hmm. I could have spent less money and got a more elegant solution. It's a pity I didn't see your post before I placed the order.

What do these Y caps do for me? Can I live without them?

Juergen Knoop · 24th July 2009, 08:07 PM

Quote:

Originally posted by PJPro

What do these Y caps do for me? Can I live without them?

Yes, you can (live without them)!
regards

infinia · 24th July 2009, 08:11 PM

The Y caps really add quite a lot to the input filter both common and diff mode. 20-50 dB at HF.
If your case isn't fully metal enclosed ie shielded then its added value isn't all that great.

We want our DIY projects to be all that they can be and a bit more, besides in engineering as in life everything is a tradeoff. Can you live without a chip amp even? probably

PJPro · 24th July 2009, 08:29 PM

Maybe I'll see what they sound like without the caps first. I'm assuming that these filtered modules won't sound any worse than an unfiltered module......that would be a kick in the teeth!

Juergen Knoop · 24th July 2009, 08:29 PM

imho the difference is small. Medical filters will offer you a basic protection and rf will enter your amp at the other 'inputs' (audio in + speakerout) too.
And for the most annoying power line born switching distortions, those IEC filter inlets are useless...just toys..

regards

infinia · 24th July 2009, 08:56 PM

Quote:

Originally posted by Juergen Knoop
imho the difference is small. Medical filters will offer you a basic protection and rf will enter your amp at the other 'inputs' (audio in + speakerout) too.
And for the most annoying power line born switching distortions, those IEC filter inlets are useless...just toys..
regards

That's right you have to consider the whole (ie all in's and outputs). This powerline filtering is serious biz and getting more important everyday. Probably most garbage is due to computers and other household consumer devices that use cheap SMPS. the most effective solution is to attack the noise issues from whense they come. It's cheap (and easy if you know how) to add a couple of caps to get 30 dB of noise reduction in the band of SMPS high harmonic conductive emissions. I use toroids on all my computer ins and outs esp when interfaced with external audio and video.

So what does all this mean is... you are probably better fitting your new part on your household PC IMO is what your best option is.

PJPro · 27th July 2009, 09:31 PM

Well, the delivery from Mouser arrived today.......and it looks like I've ordered the wrong fuse holder. Damn! This is particularly disappointing as I entered into an online web chat with one of their tech guys (Chuck) to make sure I got the right one.

Here's a picture...

Basically, the module accomodates two pole fusing and I purchased a single pole fuse holder. I explained exactly what I needed. I assumed that the single pole fuse holder would come with a shorting bar or something.

Damn!

Have to say that the module itself is very well made though......not that it makes me feel any better!

pacificblue · 28th July 2009, 07:02 AM

Quote:

Originally posted by PJPro
I assumed that the single pole fuse holder would come with a shorting bar or something.

They sent you the wrong drawer.

24th July 2009, 07:35 PM	#112
infinia diyAudio Member Join Date: May 2005 Location: Californication	If it were my call (RF design guy) I would solder the caps real close to the filter case and dress it down so there's still room for the faston. Or just solder everything and ditch the faston. __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

24th July 2009, 08:11 PM	#115
infinia diyAudio Member Join Date: May 2005 Location: Californication	The Y caps really add quite a lot to the input filter both common and diff mode. 20-50 dB at HF. If your case isn't fully metal enclosed ie shielded then its added value isn't all that great. We want our DIY projects to be all that they can be and a bit more, besides in engineering as in life everything is a tradeoff. Can you live without a chip amp even? probably __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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24th July 2009, 07:25 PM	#111
PJPro diyAudio Member Join Date: May 2009	Unfortunately, the goods have left the US and are at Stanstead (UK). My solution would be to solder one lead of each cap onto the wires coming from the transformer and the other lead onto the earth wire. I'd then place these soldered ends into the crimps. Is this regarded as a pucker solution?

24th July 2009, 08:01 PM	#113
PJPro diyAudio Member Join Date: May 2009	Hmm. I could have spent less money and got a more elegant solution. It's a pity I didn't see your post before I placed the order. What do these Y caps do for me? Can I live without them?

24th July 2009, 08:29 PM	#116
PJPro diyAudio Member Join Date: May 2009	Maybe I'll see what they sound like without the caps first. I'm assuming that these filtered modules won't sound any worse than an unfiltered module......that would be a kick in the teeth!

24th July 2009, 08:29 PM	#117
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	imho the difference is small. Medical filters will offer you a basic protection and rf will enter your amp at the other 'inputs' (audio in + speakerout) too. And for the most annoying power line born switching distortions, those IEC filter inlets are useless...just toys.. regards

27th July 2009, 09:31 PM	#119
PJPro diyAudio Member Join Date: May 2009	Well, the delivery from Mouser arrived today.......and it looks like I've ordered the wrong fuse holder. Damn! This is particularly disappointing as I entered into an online web chat with one of their tech guys (Chuck) to make sure I got the right one. Here's a picture... Basically, the module accomodates two pole fusing and I purchased a single pole fuse holder. I explained exactly what I needed. I assumed that the single pole fuse holder would come with a shorting bar or something. Damn! Have to say that the module itself is very well made though......not that it makes me feel any better!

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