What can i made from 2x55VAC 1000W toroidal transformer ?
 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
 14th November 2017, 07:20 PM #31 asuslover   diyAudio Member   Join Date: Aug 2016 Location: USA That's right. I used edit again. No reason to argue here. Last edited by asuslover; 14th November 2017 at 07:24 PM.
diyralf
diyAudio Member

Join Date: Aug 2016
Quote:
 Originally Posted by AudioSan the point is: 2x55Vac sec transformer will give you around 375W average at 8ohm. 55x1.41=77.5Vdc rails. 77.5x0.707=54.8Vrms. 54.8x54.8/8=375W average at 8ohm and not 180W. however. this is a teoretical ideal world. in the real world there will be some voltage loss. how much depends on the amp.
That's 60% true. But the transistors eat power too for the heat sink. I have an 150W amp that dissipates 50W into the heat sink.

 14th November 2017, 07:36 PM #33 AudioSan   diyAudio Member   Join Date: Feb 2009 heat disipation got nothing to do with it. that do not change any voltage sving. it's the same calculation if its class A class A/B or class D or what ever. the heat disipation is the result of consumed current at the given voltage by the outputs. and there is ofcourse a couple of volts lost in the outputs too. i have a 25W amp that dissipates 125W at the heatsink at idle for each ch. but still, +/-24V rails still gives me 25W average at 8ohm.
diyAudio Member

Join Date: Dec 2002
Location: Calgary, Alberta
Quote:
 Originally Posted by diyralf The 40% "lost" refers to the heat dissipation from the transistors not the transformer.
Why are you are you arguing? You are still wrong.

Quote:
 Originally Posted by diyralf 55VAC -> 55Vrms@1000W -> 55Vrails -> 55V/sqrt(2) = 38Vrms -> sqr(38V)/8ohm=180Watt rms
This calculation is simply wrong. If the transformer is rated for 55VAC at 1000VA then the rails can be +/- 76VDC. The output can be 54Vrms - active device headroom required, not 38Vrms. Don't ******** that you accounted for real world losses, those don't magically equate to sqrt(2).
__________________
There are still unbridgeable divisions between cultures. How can two peoples ever come to understand each other when one of them is ignorant of Totò? Umberto Eco

 15th November 2017, 09:33 AM #35 diyralf diyAudio Member     Join Date: Aug 2016 With 1000W load, your headroom is 54V. That means 54Vp for output. 54Vp means 38Vrms. Don't mix up peak and rms.
 15th November 2017, 10:37 AM #36 AudioSan   diyAudio Member   Join Date: Feb 2009 like you do? its not 54V peak. peak voltage would be around 77V
 15th November 2017, 12:20 PM #37 AndrewT   R.I.P.   Join Date: Jul 2004 Location: Scottish Borders nothing wrong with any 4year old Thread. The rectifier passes the peak of the sinewave to the smoothing capacitors. A dual 55Vac 1kVA transformer could have a peak voltage of around 124Vac on the bridge rectifier. That would give ~ 175Vdc across the two smoothing capacitors, i.e. +-87Vdc __________________ regards Andrew T.

 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         Holton Precision Audio         CSS         Dx Classic Amplifiers         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 sekhar Power Supplies 5 11th July 2010 11:25 PM SQLGuy Solid State 13 31st December 2009 06:41 PM Ghianni Power Supplies 8 15th November 2006 04:44 PM Jan Dupont Swap Meet 0 19th October 2005 08:05 PM

 New To Site? Need Help?

All times are GMT. The time now is 04:07 AM.