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Old 16th April 2012, 01:52 AM   #11
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It is worth putting it into a nice enclosure, with separate power supply for even lower noise.
Look at it in the night, gorgeous sight with all these lights. Just singing
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Old 17th April 2012, 01:07 AM   #12
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Anyone knows these kind of smd resistors? They are the same kind as used into the original LC Phono. Thanks.
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Old 17th April 2012, 01:36 AM   #13
srh is offline srh  New Zealand
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Hi Algar_emi, The resistors are known as MELF.
Regards,
Steve.
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Old 17th April 2012, 01:45 AM   #14
mlloyd1 is offline mlloyd1  United States
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algar_emi:

that's beautiful work! i always liked that design with the clever use of the AD844.
nice to hear that it sounds good, too!

mlloyd1
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Old 18th April 2012, 12:08 AM   #15
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Thanks for the resistor info. Do you think they are carbon resistor, or MELF is merely a SMD format? Tx
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Old 18th April 2012, 12:14 AM   #16
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go to distrelec there you finf vishay metal film melf they are never carbon
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Old 18th April 2012, 12:16 AM   #17
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This are 1W. they come in lower wattage too.https://www.distrelec.de:443/metallf...mmb0207/710057
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Old 18th April 2012, 02:29 AM   #18
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I guest Distrelec doesn't sell to North America. Too bad I would I like to try the same type of resistor as LC uses.
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Old 1st September 2012, 12:21 AM   #19
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Hi. I thought I'll share with you step by step how it is a lot of work to build an enclosure for your project. I know that for me that the longest step of any project. I love my LC Audio phono preamp that I decided to install it into a nice enclosure.

As some of you may know I try to recycle old enclosures when I can. In this case it is a satellite TV received that had been collecting dust for so years now.

What is nice about commercial or industrial enclosures is that they are well built, even the cheap commercial ones. They are a strong, squared (important when trying to align metal parts), well designed, and well finished, all for free. With a little work (well a lot...) they can make the foundation of a nice enclosure.

The one I choose had a ventilated top, all steel construction (important for phono preamp shielding) and was just the right size. It has a switching power supply already mounted. I removed it, studied the circuit, cut the board, removed the unneeded parts and modified it to suit my needs. This way I was able to keep the AC entry connector and nice PCB fit. I also modified the bottom, removed the unneeded pcb standoff, and keep the ones I can reused. What is also great about the particular enclosure is that I can remove the rear panel with just two screws.

The top panel fits into a plastic front panel. I discarded the cheap front panel since I was planning the replace it with a nice brushed aluminum one. I had to cut some of the top metal tongue that inserts into the plastic front. The top is steel but still pretty thin, so I could still use my none ferrous bench saw blade using cutting oil. Check the picture, the end result is not bad.
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Old 1st September 2012, 12:31 AM   #20
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One good way of mounting PCB and parts is to use a sub plate mounted on the bottom with just a few screws. This way you spare the bottom of numerous holes and screw heads. It makes for an easier assembly job too. I like it in particular with a used enclosure. The sub plate matches the weird original mounting pattern then you can mount your own parts where you need it. I installed all my standoff for the PCB on the sub plate. As you can see this is a lot of drilled holes.

Since it is a phono preamp, I planned to have the ac power section shielded from the sensitive phono section. In order to do so I'll have all the big power transformers separated by a steel dividing wall (see in the middle of the case). The further increase the shielding I put mu-metal plate on the transformer sides. This mu-metal, self-adhesive material from 3M is just great. It is used in my Air Tight preamp as well. I know that a separate power supply is even better for noise rejection, but I hate all those little supplies that I have in my racks. If I can have all the parts in one enclosure I'll do it. This preamp was dead silent on the prototype with the transformers mounted close to the PCB. I expect no problem on the final product. We'll see.
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