Another realization of Bob Cordell's THD Analyzer - Page 2 - 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 22nd July 2010, 07:28 AM   #11
diyAudio Member
 
Join Date: Dec 2007
The input control level box.
After several attempts, I opted for trimmer capacitor to obtain constant amplitude on the entire range.
To next...
Attached Images
File Type: jpg Input Level Box.JPG (51.9 KB, 523 views)
  Reply With Quote
Old 3rd August 2010, 12:54 PM   #12
diyAudio Member
 
Join Date: Sep 2006
Quote:
Originally Posted by giulianodes View Post
The input control level box.
After several attempts, I opted for trimmer capacitor to obtain constant amplitude on the entire range.
To next...
Nice work!!

I'm sorry I did not catch this thread earlier.

Best regards,
Bob
  Reply With Quote
Old 3rd August 2010, 01:57 PM   #13
diyAudio Member
 
Join Date: Dec 2007
Thanks Bob,
the compliment said by you is worth more.

I take this opportunity to know the reason about this?
Quote:
The circuit does not oscillate in the range of 200 kHz if resistors (E) - (F) connections are Longer Than 2 / 3 inches. It Is Worse even if I use shielded cable.
If Increase the value of C (LN) only (ie 470pF), then the circuit Takes to swing (frequency appropriate to the capacity added) by and bypass cap series resistors.
I do not think the PCB tracks are Longer Than The original circuit wiring.
Which is the reason for that?


Thanks in advance
Giuliano
  Reply With Quote
Old 28th August 2013, 03:02 AM   #14
diyAudio Member
 
mrsavage's Avatar
 
Join Date: Nov 2011
Location: Columbus, Ohio
Default Interested in PCB's for Cordell's THD or clone

I's insterested in either the original Cordell's THD PCB's or the clone in this
thread. ANY interest, please post and lets see what happens.
  Reply With Quote
Old 28th August 2013, 03:54 AM   #15
mlloyd1 is offline mlloyd1  United States
diyAudio Member
 
mlloyd1's Avatar
 
Join Date: Feb 2001
Location: illinois
you should ask giulianodes if willing to share his PCB designs.

mlloyd1
  Reply With Quote
Old 28th August 2013, 05:28 AM   #16
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Could we get any updates from Bob before making new versions of his original design. What could be improved, if anything? reed relays instead of switches? Different IC's for oscillator?

Glad it got redone so other people can make it.

Thx-RNMarsh
  Reply With Quote
Old 28th August 2013, 05:47 AM   #17
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Good idea.

I think there are a few areas which can improve with an update.
The least is balanced input / output from analyzer and oscillator.
Here you can find my humble attempt at that :

My implementation of the Cordell Distortion Analyser

Also Glen has done a lot of work on Bob's design. See :

An Audio T.H.D. Analyser


Patrick
__________________
xen-audio.com
  Reply With Quote
Old 28th August 2013, 03:06 PM   #18
diyAudio Member
 
Join Date: Dec 2007
Hi everyone,
I see that this project will never fade!
For various reasons, job, family etc ... I have not yet completed it.
Guilty even of too many options that I decided to add: Frequency counter and two RMS digital voltmeter (for IN and OUT signal).

I am happy to share the PCBs files with you.
But PCBs are Circad format. If it is not 'a problem for you.
If necessary, I have the standard Gerber files.

If someone wishes, I have available a complete set of PCBs.
They are designed for use with 9V mini relay (AGN20009) instead switches.
Gift a few 2N4091, for those who buy the PCB.

As soon as possible, if you wish, I provide the link with all files.

Have a nice day

Giuliano
  Reply With Quote
Old 28th August 2013, 06:12 PM   #19
davada is offline davada  Canada
diyAudio Member
 
Join Date: Jul 2004
Location: Fort St John, BC Canada
Can you generate gebers from you software.
This probably the easiest way.
__________________
David.
  Reply With Quote
Old 29th August 2013, 10:33 AM   #20
diyAudio Member
 
Join Date: Dec 2007
Hi,

this the Gerber Cordell THD files link.
https://www.dropbox.com/sh/ix4balwfq3vurzo/iTlXkNm5l7

I am available for any information

BR
giuliano
  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
Chip THD% Analyzer jackinnj Equipment & Tools 1 27th December 2007 09:28 PM
Realization system 2.1 franck1234 Full Range 8 8th August 2007 04:17 PM
Switch realization for this idea rtarbell Parts 4 7th March 2007 03:14 PM
thd analyzer-on-a-chip unclejed613 Everything Else 0 2nd January 2007 10:18 PM


New To Site? Need Help?

All times are GMT. The time now is 06:28 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