how to make a clean square wave?
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
Lars Clausen
diyAudio Member

Join Date: Oct 2003
Location: The Lab
Quote:
 1 x f + 1/3 x 3f + 1/5 x 5f + 1/7 x 7f....
If f=1 kHz, isnt 3f then 3 kHz?

And since 1/3 x 3 kHz is 1 kHz, isn't then 1/3 x 3f the same as 1 x f ?

So 1 x 1f + 1 x 1f + 1 x 1f ... or just infinity f

Did i miss something?

bigparsnip
diyAudio Member

Join Date: Apr 2003
Location: Cambridge
I think what it should be is a bit more like the thing below (try typing that into v-bulletin) which holds true of all repeating signals, not just square waves (they just hapen to have much larger percentages of the higher harmonics than some other signals like sine, or triangle waves).
Attached Images
 fourier equation.gif (557 Bytes, 88 views)

Mr Teal
diyAudio Member

Join Date: Nov 2003
Quote:
 Originally posted by Lars Clausen If f=1 kHz, isnt 3f then 3 kHz? And since 1/3 x 3 kHz is 1 kHz, isn't then 1/3 x 3f the same as 1 x f ? So 1 x 1f + 1 x 1f + 1 x 1f ... or just infinity f Did i miss something?

Lars, what he meant was 1A x 1f + 1/3A x 3f + 1/5A x 5f ... etc, where A = amplitude.

 6th September 2004, 10:55 PM #24 HFGuy   diyAudio Member   Join Date: Sep 2004 Location: Toronto, Ontario Who says Math cant be fun ? Fourier Series of a Square wave ∞ x(t) = ∑ (4V/ k* pi) sin (kwt) V = amplitude k =1 Where k is odd So basically you get the fundamental w (angular freq) and odd harmonics decreasing at a rate of 1/k w = 4V / pi 3w = 4V / 3pi 5w = 4V / 5pi and so forth until finity or you stop caring

 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 Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Room Acoustics & Mods     Music     diyAudio.com Articles     Car Audio     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post lineup Solid State 20 9th October 2006 12:15 AM Circlotron Analogue Source 18 25th January 2003 06:44 AM

 New To Site? Need Help?

All times are GMT. The time now is 01:31 AM.

 Home - Contact Us - Advertise - Rules - diyAudio Store - Sponsors - Privacy Statement - Terms of Service - Top - Opt-out policy

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.