Author Topic: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x  (Read 234881 times)

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Offline Nuno_pt

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #50 on: October 23, 2016, 09:22:25 pm »
The price from the link that @zlymex post from tabao shows $0.24 each, plus shipping from @zlymex to both US & EU host's.
The shipping from @zlymex to each host (1 in US, 1 in EU) would be divided by all in each group.
Then each one in that group (US & EU) would pay the shipping from the host to is address to the host.
Also from my point of view makes more sense after @zlymex give the shipping price for each host, and we've close the numbers of the buy, that all should pay directly to @zlymex, leaving that way only the last shipment to pay to the host.

From what I get till now, here are some numbers;

Europe:
@Theboel - 20
@eliocor - 30 (Buy Limit)
@pmcouto - 30 (Buy Limit)
@Squantor - 30 (Buy Limit)
@pelule - 30
@branadic - 30
@hammy - 30
@ Nuno_pt - 30
@Cerebus - 20
@manganin - 30 (Buy Limit)
@2N3055 - 20
@MosherIV - 3
@janode - 20
@Alex Nikitin - 30 (Buy Limit)
@babysitter - 30
@plesa - 30



US:
@evb149 - 30 (Buy Limit)
@MatteoX - 30 (Buy Limit)
@orin - 20
@VintageNut - 25
@Galaxyrise - 20

Asia - 20


Anyone missing?

Updated & Buy Limit impose to 30 for person, because of the explanation below given by @zlymex, after this there could be organize another group buy for those that need more parts, but this propose is to try the 2DW23x series for drift beside the LM399/LTZ1k.

Updated
« Last Edit: October 25, 2016, 07:38:57 am by Nuno_pt »
Nuno
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Offline Cerebus

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #51 on: October 23, 2016, 09:48:45 pm »
Put me down for 20 or whatever turns out to be the nearest convenient quantity.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline manganin

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #52 on: October 23, 2016, 09:51:42 pm »
200 pcs / EU
 

Offline 2N3055

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #53 on: October 23, 2016, 10:19:45 pm »
Can I have 20 pcs/EU please?
 

Offline martinr33

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #54 on: October 23, 2016, 10:54:04 pm »
Mine came from here:

https://world.taobao.com/item/35862405041.htm?fromSite=main

I think that is the same supplier. The ones I have have a colored dot on the side, and a black diamond logo, part number and date code on the top. One batch is 2016, the others are 2015.

I opened a couple up, they have a white silicone seal not an epoxy seal. I'll try to get the silicone off, get some pictures.
 

Offline zlymexTopic starter

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #55 on: October 23, 2016, 11:36:49 pm »
Well, that amount(summarized by Nuno_pt) certainly exceed my expectation.
Like I said, I'll buy 200-300 pcs and ship to one oversea location(USA) at my own expense.
The purpose of the 'group buy' from my point of view is for test for EEVBLOG members, therefore I hope not exceed 20-30 pcs each.
The reason for the limit is the availability from one seller, also because of the customs here which may have very strict rule for random packages.
Again, This zener has the best noise property I've ever tested, but the T.C. is just average, and drift is a question mark.
 

Offline zlymexTopic starter

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #56 on: October 24, 2016, 12:01:50 am »
The price from the link that @zlymex post from tabao shows $0.24 each, plus shipping from @zlymex to both US & EU host's.
The shipping from @zlymex to each host (1 in US, 1 in EU) would be divided by all in each group.
Then each one in that group (US & EU) would pay the shipping from the host to is address to the host.
Also from my point of view makes more sense after @zlymex give the shipping price for each host, and we've close the numbers of the buy, that all should pay directly to @zlymex, leaving that way only the last shipment to pay to the host.

From what I get till now, here are some numbers;

Europe:
@Theboel - 20
@eliocor - 30 to 50
@pmcouto - 50
@Squantor - 20 or more
@pelule - 30
@branadic - 30
@hammy - 30
@ Nuno_pt - 30
@Cerebus - 20
@manganin - 200


US:
evb149 - 25 to 250
MatteoX - 25 or more
orin - 20


Anyone missing?
Thanks very much for the plan and summery. One reason(the expense on me) is that I have difficulty in receiving money from where I reside.
There is no worry thought for this zener to sold out even the group test results are positive because the zener is in production.
The there one slight worry though, the quality may vary among batches. The taobao link I posted is the one which I've tested and proofed to have low noise.

The reason I bought 550pcs of 2DW234 from another seller is because one of my friends bought some samples before and tested to have narrow distribution of zero TC current. The seller got 1100 pcs and we bought them all. These 2DW234 were dated 13-2(Feb 2013) and we cannot find any others seller selling the same thing. New devices, although low in noise, they tends to have large(but similar) distribution of zero TC current, regardless of the part number.
 

Offline Cerebus

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #57 on: October 24, 2016, 12:54:43 am »
also because of the customs here which may have very strict rule for random packages.

I think customs only cares about incoming packages, not outgoing packages.

Not Chinese customs. They clear outbound packages too. When I order things from China that come with tracking codes I often explicitly see the step in the tracking details. For example, from an order that's currently in transit:

09-Oct-2016 09:41   Departure export customs   SHENZHEN

For the most part they seem to go into export customs and come straight out again, but I've had orders that have sat in Chinese export customs for several days.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline Cerebus

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #58 on: October 24, 2016, 12:56:57 am »
One reason(the expense on me) is that I have difficulty in receiving money from where I reside.

Or they can pay me to my PayPal or WellsFargo account, then I can transfer money to you in CNY from my SPDB account.
I live in US and I have both US and Chinese bank accounts.

This is how people end up in 'extended screening' at the air port. The NSA connect you to a series of payments that take a circuitous route via a Chinese bank account...  ;)
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline VintageNut

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #59 on: October 24, 2016, 01:08:01 am »
The price from the link that @zlymex post from tabao shows $0.24 each, plus shipping from @zlymex to both US & EU host's.
The shipping from @zlymex to each host (1 in US, 1 in EU) would be divided by all in each group.
Then each one in that group (US & EU) would pay the shipping from the host to is address to the host.
Also from my point of view makes more sense after @zlymex give the shipping price for each host, and we've close the numbers of the buy, that all should pay directly to @zlymex, leaving that way only the last shipment to pay to the host.

From what I get till now, here are some numbers;

Europe:
@Theboel - 20
@eliocor - 30 to 50
@pmcouto - 50
@Squantor - 20 or more
@pelule - 30
@branadic - 30
@hammy - 30
@ Nuno_pt - 30
@Cerebus - 20
@manganin - 200


US:
evb149 - 25 to 250
MatteoX - 25 or more
orin - 20


Anyone missing?


25 pcs for me. If Zlymex ships to me, I will ship to the other people in the US. I can also ship USPS to Indonesia. I have Paypal and I can receive the shipping fees. I have participated in sharing components on Diyaudio.com  These parts will go fast.

If Zlymex can only get 300 pcs, there will not be an ability to send 200 pcs to anyone. Everybody be realistic about how many of these parts are available.

The idea is for people to try these Zeners to see if they are lower noise and can work as a reference for DIY metrology at home.

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Offline MosherIV

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #60 on: October 24, 2016, 06:52:24 am »
Hi

Can I have 2 or 3 peices please?

Thanks
 

Offline zlymexTopic starter

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #61 on: October 24, 2016, 07:15:51 am »
Thank everyone for the info/suggestions/comments.

Initially in this post, I just share some information, providing aliexpress.com(same boss as taobo) links, because I know many people buy electric parts there even with free shipment. Then I heard some bad news that they didn't ship or wrong parts, plus Nuno_pt suggest me to help, that's when I came in.

I've just asked our company's postal office that there is only one postal company to mail to USA, which is EMS China, although the price is high(240 RMB for 500g), I can cope with that. I've never heard ePacket, may be I've never mail anything abroad, may be that service is not available to my area, may be I didn't ask other places.

I'm buying 2DW232 from taobao now, the data code is 15-4, for which I've bought and tested before.

If everything is Ok(my spot check, postal, tests by recipients), and anyone need large quantity, a real group buy can be start later. But if that is still by me/taobao, I will again buy small samples first.

Again, this is a trial at my expense, I don't have any connections with the seller at taobao or the 17th radio factory. If anyone need some piece of 2DW232 for test, leave your comments here, my intention is to get more people involved in testing. For those who have said needing more than 30 pcs, lets see if there are something left.
« Last Edit: October 24, 2016, 07:25:46 am by zlymex »
 
The following users thanked this post: hammy, Nuno_pt, Squantor

Offline Nuno_pt

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #62 on: October 24, 2016, 10:11:53 am »
Post with quantities updated above, because of this Zener is still in production and can be bought in another group buy with the help from @zlymex, and also because of what @zlymex explain above, the limit will 30 pieces for each person, at a later stage another group buy can be organize and the ones that want more can buy on the second round.

This small quantities of 30 is to choose the best's and to make some PCB's, and look at the comparison about drift in relation to the more use Zeners like LM399/LTZ1k, and see if they can be use also for references in a home lab.

240RMB is 33€ at today exchange, for the EU group with the current committed members the shipping cost from @zlymex to the EU host is 33€/11 members = 3€ each members + ~0.24€ each Zener + shipping from the EU host to each one.

So for 30 pieces that will be 0.24€ each x 30 pieces = 7.20€ + 3€ shipping from @zlymex to EU = 10.20€, plus the shipping from the host to each.
Nuno
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Offline manganin

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #63 on: October 24, 2016, 10:20:28 am »
200 pcs / EU

My new 100 input scanner will be ready soon. Or actually two of them.

The seller's price at Taobao looks like USD $0.25 each

Cheap enough for a statistical experiment. If available in large quantity...
 

Offline Alex Nikitin

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #64 on: October 24, 2016, 10:48:34 am »
Count me in for 50 pieces.

Cheers

Alex
 

Offline janode

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #65 on: October 24, 2016, 03:42:43 pm »
 

Offline babysitter

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #66 on: October 24, 2016, 04:03:02 pm »
If not too late, i will take 30 pcs too.
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Offline BravoV

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #67 on: October 24, 2016, 04:06:42 pm »
Me 20

Offline janode

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #68 on: October 24, 2016, 04:07:13 pm »
My bet is they simplt relabelled old stock transistors and sold them. Try them for gain, it might be a Germanium PNP transistor with a badge job.

I'm too young for germanium transistors  :-DD I measured Vf 0.7V so silicon. Vz ~5.6V @ 5mA. It would have been more fun to find out they were something weird rebadged, but no..
 

Offline Cerebus

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #69 on: October 24, 2016, 04:12:57 pm »
I'm too young for germanium transistors  :-DD I measured Vf 0.7V so silicon. Vz ~5.6V @ 5mA. It would have been more fun to find out they were something weird rebadged, but no..

I'm old enough to remember scraping the paint off the outside of glass encapsulated OC71s to convert them into phototransistors.  :(
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline Echo88

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #70 on: October 24, 2016, 06:21:42 pm »
Can someone tell me, how all of you are gonna make use of the low noise while maintaing extremely low drift? Wouldnt it be more reasonable to just stick together a few LTZ1000 to get sqrt(n) noise reduction, while having a very low drift, backed by decades of experience?  ???
 

Offline Nuno_pt

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #71 on: October 24, 2016, 06:22:34 pm »
Update, just missing @BravoV since I can't see is flag.

For now:

383 for EU.
115 for US.
20 for Asia.


Let's see how many @zlymex was able to buy,  and then figure a way to split them if enough for all at same time, or we've to buy the rest on the second round.

For now also if put only 30 pieces for each one, base on the 300 units that @zlymex told.
« Last Edit: October 25, 2016, 07:41:25 am by Nuno_pt »
Nuno
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Offline Nuno_pt

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #72 on: October 24, 2016, 06:33:21 pm »
Can someone tell me, how all of you are gonna make use of the low noise while maintaing extremely low drift? Wouldnt it be more reasonable to just stick together a few LTZ1000 to get sqrt(n) noise reduction, while having a very low drift, backed by decades of experience?  ???

On the first page @zlymex show that the 2DW23x has lower noise then the LTZ, but what we'll see is the long time drift, if it's something like the LTZ with can be good since for let's say 4 modules it cost around $1 plus shipping, while the same 4 LTZ it's $200 plus shipping.

For me will be an experiment about long time drift.
Nuno
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Offline plesa

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #73 on: October 24, 2016, 06:36:32 pm »
Count me in, please. 30pcs (buy limit)
 

Offline TiN

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Re: Ultra Low Noise Reference 2DW232, 2DW233, 2DW23x
« Reply #74 on: October 24, 2016, 06:40:28 pm »
Subbed  :popcorn:
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