Graetz Bridge Questions
 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

 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
 20th April 2009, 03:54 PM #1 kacernator   diyAudio Member   Join Date: Jan 2008 Graetz Bridge Questions Hi, I am little confuse about graezt (diode) bridge rectifier circuit. Lets say I have 0-20V 1A secondary winding. If I rectify that with graetz bridge cap input filter I will get voltage of 1.4*20V. But how about current? I read somewhere that graetz is only 60 percent efficient, so that means I can only draw 600mA from secondary max? If I do draw the 600mA from graetz bridge will the actual load on transformers secondary be too 600mA? Thanks.
jan.didden
diyAudio Member

Join Date: May 2002
Location: The great city of Turnhout, BE
Re: Graetz Bridge Questions

Quote:
 Originally posted by kacernator Hi, I am little confuse about graezt (diode) bridge rectifier circuit. Lets say I have 0-20V 1A secondary winding. If I rectify that with graetz bridge cap input filter I will get voltage of 1.4*20V. But how about current? I read somewhere that graetz is only 60 percent efficient, so that means I can only draw 600mA from secondary max? If I do draw the 600mA from graetz bridge will the actual load on transformers secondary be too 600mA? Thanks.

The 1A spec is an RMS spec. It's not exacrtly the average current, but somewhat similar.The 20V is also an RMS voltage and that gives you 20Watts RMS capability. So if your rectified voltage is 26V (you lose about 2V in the rectifier diodes) and you would want to take 1A out of it you try to take 26Watt! So in this case you can only take say 0.6 or 0.7A to keep within the xformer spec.
And indeed, that 0.65A DC from the rectified voltage translates to about 1A RMS from the secondary!
You CAN take 1A from the rectified DC but probably the xformer sec will drop too much and the xformer will become too hot...

Jan Didden
__________________
Cable: a potential source of trouble interconnecting two other potential sources of trouble - Erik Margan
Linear Audio pubs and articles . The SilentSwitcher now at diyaudio store SilentSwitcher. Keeping in touch with SY.

 20th April 2009, 05:42 PM #3 kacernator   diyAudio Member   Join Date: Jan 2008 Thank you very much!

 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         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 bg4533 Digital Source 11 25th March 2010 06:32 PM Reptile Car Audio 8 8th May 2008 05:04 PM alexg Tubes / Valves 3 9th April 2008 03:45 PM gilid Parts 5 24th July 2002 11:52 PM

 New To Site? Need Help?

All times are GMT. The time now is 08:50 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 © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki