Low Frequency Analog and Digital Signal Generator - Page 3 - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th April 2014, 11:04 AM   #21
diyAudio Member
 
Max Headroom's Avatar
 
Join Date: Jan 2013
Location: West Australia, straight over the road from the beach, natural ambient sounds only.
Quote:
Originally Posted by altor View Post
Thank you, Damien.
Waiting for your measurements.
+1 .

Dan.
  Reply With Quote
Old 16th April 2014, 05:22 PM   #22
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Demian has access to some really great jitter measuring equipment, too. he is the go to guy to eval such designs. I am getting ready to leave country for awhile but still want one.

THx-RNMarsh
  Reply With Quote
Old 2nd May 2014, 09:39 PM   #23
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
Hi Altor,

If understood well, the only difference btw the ready "JKGEN 384-12" and the 4-kit "JKGEN 384-12 Kit" is the case, cables and front rca's and others?

Then the "JKGEN 384-12 DIY Kit-2" is including everything but non assembled (except case, cables and front rca's and others)?
  Reply With Quote
Old 3rd May 2014, 08:55 AM   #24
diyAudio Member
 
Join Date: Oct 2003
Location: Europe-Asia
Quote:
Originally Posted by lemon View Post
Hi Altor,

If understood well, the only difference btw the ready "JKGEN 384-12" and the 4-kit "JKGEN 384-12 Kit" is the case, cables and front rca's and others?
Yes.

Quote:
Then the "JKGEN 384-12 DIY Kit-2" is including everything but non assembled (except case, cables and front rca's and others)?
It also does not includes resistors, capacitors, connectors, and other "not so important components".
Only Main PCB + Output&DAC PCB + FrontPanel PCB + IC + TFT +Encoder + Clock PCB (assembled).

P.S. All the prices at the site www.altor.co are temporary, and can be changed in the future.
__________________
Regards, Alex
www.altor.co
  Reply With Quote
Old 4th May 2014, 07:50 PM   #25
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
Thanks for the answering.
At the JKGEN 384-12 Kit the components are soldering?
  Reply With Quote
Old 4th May 2014, 07:58 PM   #26
diyAudio Member
 
Join Date: Oct 2003
Location: Europe-Asia
Quote:
Originally Posted by lemon View Post
Thanks for the answering.
At the JKGEN 384-12 Kit the components are soldering?
At "Kit" - yes, at "Kit-1" and "Kit-2" - no.
__________________
Regards, Alex
www.altor.co
  Reply With Quote
Old 6th May 2014, 08:17 PM   #27
1audio is offline 1audio  United States
diyAudio Member
 
Join Date: Mar 2004
Location: SF Bay Area
Blog Entries: 3
I have been meaning to post some measurements but two thinks happen everytime I start. First, I find that the limits are the DAC I'm testing. Second, that I can find some small tweaks to the measurements to get better results, but they are all at the DAC side. The generator is essentially "perfect" and anything you measure is in the DAC.

I'll try to illustrate this soon.
__________________
Demian Martin
Product Design Services
  Reply With Quote
Old 6th May 2014, 09:50 PM   #28
1audio is offline 1audio  United States
diyAudio Member
 
Join Date: Mar 2004
Location: SF Bay Area
Blog Entries: 3
Default JTest measurement example

Here are two Jtest measurements using the JK generator's Jtest as a source over coax spdif into the demo board for the ESS9018 mobile version. On the 24 bit version the 1 bit modulation at 24 bits is lost in the noise (not really a 24 bit DAC but none are) and the 1 bit modulation is clearly visible on the 16 bit version. There are no clear jitter artifacts in either plot.

The JK source is essentially perfect in this set of plots (and any departures from perfect are in the DAC).

I'm set sort of the same as the jitter plots in Stereophile reports. They are not identical because the AP digitizer does not run at an audio sample rate. They should be similar however.
Attached Images
File Type: png ESS9018 mobile Jtest 16 bit.PNG (60.5 KB, 213 views)
File Type: png ESS9018 mobile Jtest 24 bit.PNG (54.7 KB, 211 views)
__________________
Demian Martin
Product Design Services
  Reply With Quote
Old 6th May 2014, 09:59 PM   #29
1audio is offline 1audio  United States
diyAudio Member
 
Join Date: Mar 2004
Location: SF Bay Area
Blog Entries: 3
Default Another Jtest

Here is another Jtest, this time for an AKM AKD4414 demo board. Its very similar, except you can see a little modulation on the sidebands adjacent to the carrier.

This uses the AK4118 as the line receiver.

This is where I start exploring the cause etc. and get nothing done. . .
Attached Images
File Type: png AKD4414 Jtest 16 bit.PNG (33.9 KB, 168 views)
__________________
Demian Martin
Product Design Services
  Reply With Quote
Old 6th May 2014, 10:07 PM   #30
1audio is offline 1audio  United States
diyAudio Member
 
Join Date: Mar 2004
Location: SF Bay Area
Blog Entries: 3
Default THD measurement

This is the THD of the AKD4414 board at 0dBFS or max out. This is a worst case point for many DACs. Again the distortion measures to .00026%. The THD+N is limited by the 100 KHz band of the measurement and the lower input level on the EMU1616m I'm using. At the -10 setting the EMU is clipping so I'm using +4 and the signal is about 12 dB below full scale on the EMU input.
Attached Images
File Type: png AKD4414 997 Hz distortion 0 dBFS.PNG (37.2 KB, 164 views)
__________________
Demian Martin
Product Design Services
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Kramer Tools Model 830 Digital/Analog Generator ungie Swap Meet 7 18th February 2012 08:30 PM
Digital Audio Signal Generator prairiemystic Digital Line Level 3 23rd April 2010 10:47 AM
Low Distortion Signal Generator EchoWars Everything Else 150 6th March 2010 03:56 PM
Digital Freqency To Analog Frequency dswiston Everything Else 1 1st December 2004 04:21 AM
low frequency generator computer software? player_low Parts 3 30th October 2004 06:16 AM


New To Site? Need Help?

All times are GMT. The time now is 06:27 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2