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Old 15th May 2010, 12:24 PM   #101
Frex is offline Frex  France
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Join Date: Nov 2009
Arrow oscillator PCB 2nd group buy

Hello,

EUVL,
I prefer organize a second group buy for the oscillator pcb.
But for this next group buy, and mostly for simplify the order and to consider the needed time to do it, i don't ask the same price.
As the previous group, i start only the order if ten or more printed circuits board is asked.

The price for each PCB would be 30 for one. This price will include;
  • New order to PCB for at least ten boards.
  • Customs fees to my country
  • A good packing for the PCB (bubble envelope)
  • Shipping cost to you in international priority letter (no insurance).
  • The Paypal fees when you payed me.
  • A little contribution to this work.

I think it stays again at avery reasonable price.

All Diyers interested could send me a private message,
if you are enough i will open a new wiki for this new group buy.


AR2,

Thank you for your interest of the AA5381 ADC.

I can also organize a group buy for the ADC.
If a least 10 boards is ordered, i can sale it 40 each,
including all, as the 2nd oscillator group buy.
It's a very good price for a 4 layers class 5 PCB!
Of course, all design files will be send to each buyers.

DIYers interested must send me a PM, for be added to a "waiting list".
The order can be done if a least 10 boards is asked.

Regards.


Frex.
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Old 16th May 2010, 04:09 AM   #102
grenert is offline grenert  United States
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I just wanted to say I've received my oscillator boards and they are really nice quality. Thanks!
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Old 18th May 2010, 01:41 PM   #103
bbp is offline bbp  China
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Thanks to Frex's thread

I can't wait to build my own AN-67 generator ^_^
so, it come out after 2 days hard work
I test it with E-MU 1212M, balanced mono mode

It is really an excellent sinewave generator but only the 50Hz noise is not meet my expectation.


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
Attached Images
File Type: jpg AN-67 GRH.jpg (89.1 KB, 2160 views)
File Type: jpg AN-67 SELFTEST.jpg (97.8 KB, 2141 views)
File Type: jpg LOPE.jpg (139.6 KB, 1247 views)
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Old 18th May 2010, 01:53 PM   #104
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Quote:
Originally Posted by bbp View Post
Thanks to Frex's thread

It is really an excellent sinewave generator but only the 50Hz noise is not meet my expectation.
It MUST be placed in a steel container - like a cookie tin -- aluminum won't work.

Ordinary steel has its short comings, but should get the 50Hz signal down by 60dB or so. For more attenuation you can use a container within a container.

The oscillator has provision for balanced output -- if using this consider dual shielded twisted pair.

You might want to put 220u/100n on the power leads where they join the PCB -- you'll pick up a lot of 50/60Hz from the power leads.

Last edited by jackinnj; 18th May 2010 at 02:20 PM.
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Old 18th May 2010, 03:44 PM   #105
Frex is offline Frex  France
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Arrow EOSC10KV2 finished.

Hello,

I have finish the wiring and machining my own oscillator.It work very fine !
A little picture of what it look like.
Some measurements will come later .

Frex.

PS: bbp, your job is very cool .
Attached Images
File Type: jpg EOSC10KV2_01.jpg (79.4 KB, 443 views)
File Type: jpg EOSC10KV2_02.jpg (49.9 KB, 437 views)
File Type: jpg EOSC10KV2_03.jpg (53.1 KB, 318 views)
File Type: jpg EOSC10KV2_04.jpg (60.4 KB, 329 views)
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Old 18th May 2010, 03:48 PM   #106
iko is offline iko  Canada
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Very nice Frex! What are you using for psu?
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Old 18th May 2010, 04:06 PM   #107
Frex is offline Frex  France
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I terminate at this time a new +/-15V PSU based on SSR01/SSR02 ultra low noise PSU boards from P.Sjostrom. For the best performance, we can also use batteries. I find this last solution not very convenient.

Frex.
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Old 18th May 2010, 04:54 PM   #108
EUVL is offline EUVL  Europe
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Would you perhaps also be kind enough to explain your trimming procedure and measurement method ?

How is the 2nd Group Buy going ?
(I have sent you a PM a while ago.)


Thx,
Patrick
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Old 18th May 2010, 06:14 PM   #109
bbp is offline bbp  China
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Quote:
Originally Posted by jackinnj View Post
It MUST be placed in a steel container - like a cookie tin -- aluminum won't work.

Ordinary steel has its short comings, but should get the 50Hz signal down by 60dB or so. For more attenuation you can use a container within a container.

The oscillator has provision for balanced output -- if using this consider dual shielded twisted pair.

You might want to put 220u/100n on the power leads where they join the PCB -- you'll pick up a lot of 50/60Hz from the power leads.
Hi Jackinnj, I've sent the PCB file to the manufacture for a better factory made PCB, maybe the PCB will arrive the day after tomorrow.
As I know, you're the first person who made this osillator and post the test result public. I've read your post about 3~4years ago ^_^

I add a XLR connector in that version of PCB, which is not contained in this hand-made PCB
I'm going to use two 7.2V NI-CD batterys as the power supply, the batterys will not cost too much in my local market. Low-noise PSU based on OP-AMP is another good choice, like JSR series.

I don't know the wideband noise will increase or not if a high-pass filter is added following the oscillator, AD797 is a good choice I think.

My ADC in 1212M only performs -113dBFS residual noise @48K sampling rate with the input terminating. So, most of the time, I will use my VCS(Volume Control System) as a authentic-attenuator between the source and ADC. Once I set the attenuation to -20dB,the 50Hz noise and its harmonic freqency noise will be also cut-down 20dB.

compare the two graghic
original,oscillator provides 1Vrms balanced
Click the image to open in full size.

second,oscillator provides 4Vrms balanced and the VCS attenated to 1Vrms
Click the image to open in full size.




best regards
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Last edited by bbp; 18th May 2010 at 06:16 PM. Reason: modify the image link
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Old 18th May 2010, 06:37 PM   #110
bbp is offline bbp  China
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Join Date: Sep 2005
Quote:
Originally Posted by Frex View Post
Hello,

I have finish the wiring and machining my own oscillator.It work very fine !
A little picture of what it look like.
Some measurements will come later .

Frex.

PS: bbp, your job is very cool .
Thanks Frex,

I like your LAYOUT, you did a really great job ^_^
the position of components are reasonable, the axial capacitors look beautiful too

I done another ADC layout for my graduation project too, which is also based on CS5381KZ, maybe 5~6 days I can assembled the ADC and make the measurement.
The ADC part of 1212M is really good, but I want a ADC apart from my PC board ^_^

have a nice day
best regards
Lu
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