phase splitter issue
 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

 Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

 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
 Thread Tools Search this Thread
 1st December 2011, 12:38 AM #111 Dimitris AR   diyAudio Member   Join Date: Nov 2011 Location: Athens My opinion is that , in Concertina the output impedance of the anode to the ground is nothing else than the output impedance of an common cathode triode amp , and the output impedance of the cathode to the ground is equal to the output impedance of a cathode follower triod buffer . Of course we have equals output voltages in the two circuit if they aren't connected to anything else , or if they connectet to easy loads , but if we connect them to harder loads and start to drive the Concertina harder , we will see that the voltage of the anode start to fall comparing it with the voltage at the cathode , that happens because they haven't equal impedances , the anode have higher one ..
 1st December 2011, 12:40 AM #112 CPaul diyAudio Member   Join Date: Nov 2011 The analogy must be considered for all cases, not just the one you prefer. Last edited by CPaul; 1st December 2011 at 12:43 AM. Reason: removved last sentence; shouldn't have been there.
 1st December 2011, 12:42 AM #113 CPaul diyAudio Member   Join Date: Nov 2011 Let us speak in generalities, but in generalities that are compatible with your demand for impedance tests of a balanced Cathodyne that maintain balance during testing. I have a circuit with nodes A and B between which I want to determine the impedance Zab. To do so, I need to somehow create a loop that puts current Itest into node A, out of node B, past a point outside the circuit, and returns it to point A. I need to measure the change in voltage deltaV between A and B due to that current and that current only. I can then divide. deltaV by Itest to get Zab. If there is no current flowing through A or B, I can’t measure Zab. In your circuit, node B is ground and there is no current flowing through it. So you can't measure the impedance between nodes A and B.
 1st December 2011, 12:45 AM #114 CPaul diyAudio Member   Join Date: Nov 2011 Agreed, Dmitris, if there is only one harder grounded load that is switched between the Plate and Cathode for comparison.
 1st December 2011, 12:55 AM #115 Dimitris AR   diyAudio Member   Join Date: Nov 2011 Location: Athens We agreed only in this case ? , but we can not ignore the fact that from the begining the two outputs have different impedances .
 1st December 2011, 01:04 AM #116 CPaul diyAudio Member   Join Date: Nov 2011 Agreed. Even with equal loads, anode impedance is much higher than that of the cathode.
 1st December 2011, 01:10 AM #117 Dimitris AR   diyAudio Member   Join Date: Nov 2011 Location: Athens That exactly what i am saying too .
 1st December 2011, 02:25 AM #118 Wavebourn   Designer & Technologist diyAudio Member     Join Date: Sep 2006 Location: Pleasant Hill, CA You can't say that. Because doing measurements changing loads separately you disbalance Concertina, so it is not a Concertina anymore. Try to change both loads at once, equally, to keep it balanced, and calculate both resistances separately. Edit: What is remarkable, chemist SY understands electronics better than the majority on this forum, including many Electrical Engineers. What is so special in chemical education, so it so superior to education of Engineers? __________________ The Devil is not so terrible as his math model is! Last edited by Wavebourn; 1st December 2011 at 02:31 AM.
SY
On Hiatus

Join Date: Oct 2002
Location: Chicagoland
Quote:
 Originally Posted by CPaul As an Electrical Engineer of 30 years, I'm familiar with equivlent circuits.
Excellent. Go back to my figure 3 showing two amplifiers with two outputs.
__________________
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."

Chris Hornbeck
diyAudio Member

Join Date: May 2011
Location: Little Rock
Quote:
 Originally Posted by Wavebourn What is remarkable, chemist SY understands electronics better than the majority on this forum, including many Electrical Engineers. What is so special in chemical education, so it so superior to education of Engineers?
I think what's throwing so many folks is that the concertina has a floating output but its feedback is not symmetrical. If tested with equal and opposite currents driven into its outputs (IOW, as a concertina works) point impedances will measure equal. But if measured with equal but not opposite currents, or just single currents, driven into its outputs point impedances will not measure equal (because its no longer a concertina).

So we have arguments about angels dancing on the heads of pins.

Thanks,
Chris

 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 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     Car Audio     diyAudio.com Articles     Music     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         Aussie Amplifiers         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 famousmockingbird Tubes / Valves 16 10th May 2011 10:40 PM Hojvaelde Tubes / Valves 9 6th May 2011 08:32 PM grungeman91 Tubes / Valves 2 5th May 2011 02:58 AM guwakzhai Power Supplies 7 23rd December 2010 06:51 PM Gold_xyz Tubes / Valves 17 21st February 2008 10:48 AM

 New To Site? Need Help?

All times are GMT. The time now is 01:32 PM.

 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 © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki