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PC Boards for v9?

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#142
SMathews and Mike,

I contacted Veteran a little while ago and he mentioned
some boards had bounced back through the mail
service and that he was resending them. (Mine
was amongst them.) So perhaps it affected yours
as well.

I'm keeping my fingers crossed since I haven't
actually received the boards yet. 🙂

Cheers,
Dennis
 
#144
BillWW said:


I went to a computer water cooling forum and out of all of their 20 or so fans they compared, I went with their quietest fan that happened to be a 220 Volt AC fan made by Sunon model DP200A-2123XST.

It is a 120 mm fan that runs at half speed on 110 AC volts for those in the USA. Even at full speed it is very quiet. It does not have any annoying ticking or clicking sounds that a typical DC 120 mm computer fan has. I have tried both and prefer this AC fan, which will be able to hook directly up to the AC line. It is a lot cheaper than most computer fans too and is a lot more quiet than any of the quietest computer dc fans.

You can even wire a 3 watt pot with this fan to slow it down if it is too loud or add a 5 or so uF capacitor to speed it up for additional cooling.

I have it now mounted on my heat tunnel and found when it is in the back away from me, I can not really hear it across my 12 foot listening distance in my dead silent room with all of the windows shut and nothing running such as the central air or heater.

If you use the 3 watt pot and turn it down to about 900 rpm, you can not even hear it 3 feet away. Very impressive. I would say some toroid transformers are louder than this fan!!! Great for our over biased class A amps!!! :hot:

Here is what I bought.

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=997-2123

http://www.alliedelec.com/Search/ProductDetail.asp?SKU=522-0049

Here is the direct quote about this fan and then the link to it.

"The Sunon DP200A-2123XST (2123XST) is a 240V AC fan and runs 1300-1350rpm on 120V. At this speed it makes more noise than the Globe Motors fans but only because of the higher RPM. Slowed down to around 900 rpm it is almost inaudible at 1 meter in open air and pushes a good amount of air. Even at the 1300rpm level it is much quieter than the Panaflo L1A DC brushless. Almost no motor or bearing noise, it is all airflow noise. Easily the best airflow vs noise ratio of the 120x25+mm lot. Probably one of the best 120mm fans available when undervolted. It has a better airflow to noise ratio than the Nexus (for a given airflow it's quieter than the nexus / for a given quietness it moves more air) and performs gloriously in restrictive environments. Reduce the RPM with a series resistor to desired level. For more information see ferdb's posts on page 2 and <this> thread by ferdb."

http://forums.silentpcreview.com/vi...&start=0&sid=7a13cd7203155b9aa08d587550c3743d]

Here is how to use the 3 watt pot or capacitors for additional cooling how to:

http://forums.silentpcreview.com/viewtopic.php?t=17002

Regards, Bill 🙂
Click to expand...

I noticed Allied is out of this fan, but they have a rhos lead free cadmium free etc green friendlier fan, is what the current production is.

http://www.alliedelec.com/Search/Pr...&MPN=DP200A-2123XST.GN&DESC=DP200A-2123XST.GN
 
#145
That's great news. Hopefully all will work out.

SMathews

Dennis Hui said:
SMathews and Mike,

I contacted Veteran a little while ago and he mentioned
some boards had bounced back through the mail
service and that he was resending them. (Mine
was amongst them.) So perhaps it affected yours
as well.

I'm keeping my fingers crossed since I haven't
actually received the boards yet. 🙂

Cheers,
Dennis
Click to expand...
 
#147
50 V caps

bluemartini said:
so what is the downside of using 50V caps in the ZV9 powersupply since I happen to have a bunch of them?
Click to expand...


Just run your power supply below 50 volt on the rails and you will be fine. You just won't get 10 or 15 watts like others. Instead, you might get 8 or 9/ 13/14 watts of power.

Bill
 
#148
Bill,

Thanks for the fan info. I picked up a Nexus a while back, which also seems to be well regarded. I intend to use it with a pair of Conrad MF18-151.5 heatsinks forming a channel.

But, I may prefer the Sunon since the Nexus requires DC voltage.

Paul
 
#149
Sunon

Paul Ebert said:
Bill,

Thanks for the fan info. I picked up a Nexus a while back, which also seems to be well regarded. I intend to use it with a pair of Conrad MF18-151.5 heatsinks forming a channel.

But, I may prefer the Sunon since the Nexus requires DC voltage.

Paul
Click to expand...


Well, since I posted the latest quantity there were 123 at the time. As of this evening, Allied only had 63 remaining! 😱 Someone must be building one big class A amp? :devilr:

Bill
 
#155
One channel up and running

Thanks for the boards which helped the assembly of the components. I mounted one channel of the board on a large heat sink I had lying around to check the adequacy for dissipation. I also used a variant for the power supply using surplus components I had in stock ie a 60 mh choke and 52V transformer ( C core) rated for 8 amps. These were wired up as choke input supply with 20000 mfd for one channel. Gave about 42V to the board.

Trial run in my existing set up shows great promise- far superior to the Conrad johnson Mv50 I have currently.
Thanks to Nelson Pass for the design and to Damian for the boards
 
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