Circuit Maker <<questions>> - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 6th August 2006, 08:41 PM   #1
diyAudio Member
 
bogdan_borko's Avatar
 
Join Date: Nov 2005
Location: serbia, zajecar
Default Circuit Maker <<questions>>

How to measure distortion in circuit maker 2000?
How to do Fourier analysis and measure harmonics in dB?
  Reply With Quote
Old 6th August 2006, 08:59 PM   #2
diyAudio Member
 
bogdan_borko's Avatar
 
Join Date: Nov 2005
Location: serbia, zajecar
I hope you understood what i`m asking for...
I meant "Harmonic distortion".
thanks
  Reply With Quote
Old 6th August 2006, 09:08 PM   #3
Steven is offline Steven  Netherlands
diyAudio Member
 
Steven's Avatar
 
Join Date: Oct 2003
Location: The Netherlands
Default Distortion in Circuitmaker 2000

Select Analog Mode in Simulation, then go to Analyses Setup (F8), enable Transient/Fourier analysis and click on that button. In Transient and Fourier Analysis Setup enable Fourier (check box). At this moment I have the default timing selected (5 cycles, 50 points per cycle). Use a sine generator in the circuit diagram as input, e.g. at 1 kHz. Probe the output, or any point in the circuit.
Default the fourier analysis shows a linear frequency scale as the X-axis and volts or amps on the Y-axis. Right click on the Y-axis to get a pop up where you can select Primary Y-axis with Magnitude in Decibels. Then adjust the scaling, normally in the left pane, to e.g. 20dB per division and adjust the offset to get the harmonics in the graph. Distortion is calculated from the ratio of the harmonics and the fundamental.
Attached Images
File Type: png circuitmaker.png (19.4 KB, 715 views)
__________________
The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973
  Reply With Quote
Old 6th August 2006, 09:29 PM   #4
diyAudio Member
 
bogdan_borko's Avatar
 
Join Date: Nov 2005
Location: serbia, zajecar
thanks a LOT!

What is a good result in these measurements?
  Reply With Quote
Old 6th August 2006, 09:43 PM   #5
diyAudio Member
 
bogdan_borko's Avatar
 
Join Date: Nov 2005
Location: serbia, zajecar
this is not good...?
could you comment?

it is a push pull mosfet class a power follower I`m simulating... it has no feedback, classic source follower...
Attached Images
File Type: gif hd1.gif (5.9 KB, 650 views)
  Reply With Quote
Old 6th August 2006, 10:01 PM   #6
Steven is offline Steven  Netherlands
diyAudio Member
 
Steven's Avatar
 
Join Date: Oct 2003
Location: The Netherlands
Your harmonics are more than 60 dB below the fundamental, so distortion is approximately 0.1%, not bad for an open loop design.
__________________
The Analog Art shows no sign of yielding to the Dodo's fate. The emergence and maturation of monolithic processing finesse has perhaps lagged a bit behind the growth of the Binary Business. But whereas digital precision is forever bounded by bits, there is no limit excepting Universal Hiss to the ultimate accuracy and functional variety of simple analog circuits. - Barry Gilbert, 1973
  Reply With Quote
Old 7th August 2006, 09:49 AM   #7
diyAudio Member
 
bogdan_borko's Avatar
 
Join Date: Nov 2005
Location: serbia, zajecar
how did you calculated 0.1%?
  Reply With Quote
Old 7th August 2006, 11:09 AM   #8
sreten is online now sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Quote:
Originally posted by bogdan_borko
how did you calculated 0.1%?
Hi,

0.1% is a thousanth = 10 to the power - 3 x 20 = - 60dB.

From the graph 2nd and 3rd dominate so I'd say ~ 0.2%.

/sreten.
  Reply With Quote
Old 7th August 2006, 12:10 PM   #9
diyAudio Member
 
bogdan_borko's Avatar
 
Join Date: Nov 2005
Location: serbia, zajecar
thanks a lot guys!

I`ve searched the forum but haven`t found much about
what harmonic affects the sound the most (I just now the 2nd harmonic is "good") and what harmonic should we look at when we design the amplifier...

ANy link will be helpfull.
thanx!
  Reply With Quote
Old 7th August 2006, 12:17 PM   #10
sreten is online now sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

wieght the harmonics thus for degradation :

(harmonic number)squared / 4.

so 2nd = same, 3rd = x 9/4, 4th = x 4, 5th = x 25/4, 6th = x 9, etc

For 1khz 20 khz = x 100 or + 20dB, higher harmonics cannot be ignored......

/sreten.
  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
Trying to learn Circuit maker Ryssen Everything Else 33 3rd November 2011 07:21 PM
Convert formats beteen Eagle/Circuit maker Ryssen Everything Else 0 1st August 2007 11:49 PM
circuit maker library help... Flavio88 Solid State 1 2nd September 2006 04:08 AM
Triode spice models for Circuit maker bogdan_borko Tubes / Valves 3 15th August 2006 12:38 AM
Problem in Circuit Maker 2000 xitronics Everything Else 0 4th December 2005 08:04 AM


New To Site? Need Help?

All times are GMT. The time now is 10:13 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright Đ1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2