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Old 16th March 2012, 10:44 PM   #5641
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Quote:
Originally Posted by hotiron View Post
Yep have all the parts except the zvn3310 Found a VN10KM so I ran it in the sim and noise dropped to 3 nano Volts.
Need to get this thing built and see how it performs in the real world.
hotiron, this looks very promising. Looking forward to your impressions.

Is it done yet?
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Old 16th March 2012, 11:29 PM   #5642
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Quote:
Originally Posted by tonyptony View Post
I was going along the lines of what TheGimp said above - mount the mechanism on the copper plate and then use a nice box as a "shell" to support the periphery gear (display etc). I like TG's idea of actually suspending the plate somehow inside the box. If it's done this way will it matter if the box is of some plastic construction?
Let me phrase it this way: I am yet to come across a type of plastic that would benefit the sound in some way. My theory is that the resonant properties of plastics are inherently bad and this is also is the reason why plastics have never been widely adopted for use in musical instruments.
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Old 16th March 2012, 11:59 PM   #5643
billo44 is offline billo44  United Kingdom
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Quote:
Originally Posted by CeeVee View Post
Billlo 44,

You are right but answering questions is ok too.
Peter, who suggested the ERO has since changed to V-CAP, experimenting and sharing data is also ok.

I did state that one of the single most important mods to make, and that is amply documented here and in Peter's threads, is to have a very good shunt supply for the 5V.
This mod should be included as standard configuration, so huge is the change for the better.
Reason why i posted a pic of it.

I fully agree.
That sounds very much like the findings other people reported.
I want to try the bobken reg, also I want to add my name for one of Uncle Leons special caps... I'm not an 'unbeliever', just felt the need to rememeber it is all subjective.

I was trying to put together bobken regs last year and couldn't find the 15R caddock MP330 among other components.

I wonder if we could have boards and a GB on these regulators?
I think there would be much demand.

I have the BOM I was working on... Here;-
https://docs.google.com/spreadsheet/...nY4cnh3ZXMzNHc

It's currently open to editing, please post if you add an edit. I'll keep an archive. Or edit and post a new link as you wish. Or post a part choice/source and I'll add it to the BOM.

This is OK isn't it? I'm not too hot on forum protocol sorry?

Cheers
Bill
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Old 17th March 2012, 12:31 AM   #5644
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Quote:
Originally Posted by uncle_leon View Post
Let me phrase it this way: I am yet to come across a type of plastic that would benefit the sound in some way. My theory is that the resonant properties of plastics are inherently bad and this is also is the reason why plastics have never been widely adopted for use in musical instruments.
Okay uncle. I was hesitant to go with a copper plate in a metal (aluminum) box only because of possible ground or eddy current issues.
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Old 17th March 2012, 12:58 AM   #5645
TheGimp is offline TheGimp  United States
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I thought eddy currents were limited to ferrous alloys.
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Old 17th March 2012, 01:16 AM   #5646
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Not quite http://en.wikipedia.org/wiki/Eddy_current
Metals indeed may bring problems of electrical nature, especially the ferrous ones - but as case materials they are usually good, especially cymbal alloys.
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Old 17th March 2012, 02:24 AM   #5647
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So what if it was done this way? -

Use a metal chassis (let's say aluminum as it is the most likely choice for those who might go this route). Everything mounted on the copper plate. Suspend the plate from the chassis. Anything interfaced to the chassis is done so it is insulated from the chassis. Might be tricky, but should be possible.
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Old 17th March 2012, 06:19 PM   #5648
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Any advice I could give would be mere speculation on my part, as there are great many factors at play here. I was only warning about plastics because they sound rubbish pretty consistently.
If you can afford to, try a few different mounting strategies/materials and choose the one that sounds best to you. If not, what you described seems like a pretty good approach.
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Old 18th March 2012, 02:04 AM   #5649
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Hi Fran,

Think I'll give your RF attenuators recommendation a try.. I just like to know currently which combination works best for you... 10dB + 15dB ? Another question, instead of putting the 2 RF attenuators in series, have you tried putting the 2 attenuators at either ends of the DAC and Shigaclone.. and any difference ? .. my rack's quite close to the back wall.. might be a tight squeeze if I put the 2 attenuators back to back.

Quote:
Originally Posted by woodturner-fran View Post
Oh yeah - another thing. I've mentioned them a load of times in this thread but no-one has used them (here) other than me.

A better sounding alternative (IMHO) is to use RF attenuators to drop the signal to 0.5V or lower. These attenuators are precision lab devices available from minicircuits.com and cost about 12-15$ each. Look up part# HAT-6-75. Its the precision 75dB ones you want.

I would recommend anyone to try them, maybe buy 1 x 6dB, 1 x 10dB and 1 x 15dB. You can stack them in series to try out different levels. Note that they are BNC only, so you want to figure on that.


Fran

Last edited by BTW; 18th March 2012 at 02:08 AM.
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Old 18th March 2012, 09:45 AM   #5650
Turbon is offline Turbon  Sweden
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Quote:
Originally Posted by billo44 View Post
I fully agree.
That sounds very much like the findings other people reported.
I want to try the bobken reg, also I want to add my name for one of Uncle Leons special caps... I'm not an 'unbeliever', just felt the need to rememeber it is all subjective.

I was trying to put together bobken regs last year and couldn't find the 15R caddock MP330 among other components.

I wonder if we could have boards and a GB on these regulators?
I think there would be much demand.

I have the BOM I was working on... Here;-
https://docs.google.com/spreadsheet/...nY4cnh3ZXMzNHc

It's currently open to editing, please post if you add an edit. I'll keep an archive. Or edit and post a new link as you wish. Or post a part choice/source and I'll add it to the BOM.

This is OK isn't it? I'm not too hot on forum protocol sorry?

Cheers
Bill
I second a call for a GB on the regulators. I want 2 of them.

Brgds
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