Building a symmetrical psu B1 buffer
 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

 Pass Labs This forum is dedicated to Pass Labs discussion.

 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
regiregi22
diyAudio Member

Join Date: May 2009
Quote:
 Originally Posted by Malka07 Thanks Again Andrew and Regiregi22, Correct me if im wrong, but my understanding is that when resistors are used in parralel, there wattage is added on, so for example a 68r(1 watt)//68r(1 watt)//15r(5 watt) would be equivalent to a 10r(7 watt) resistor??? However im not sure if i correct in this understanding Alon
With these exact values, you will have a nearly equal disposition. The 15r one is nearly 5 times lower in value than the others (5x15=75), so it will burn 5 times more power. Being the others 1w and this one 5w, you have them almost matched. They will result in a 10r equivalent resistor, with a 7w ratting. I think you'll be fine.

Am I wrong in something?
__________________
diyAudio, doing it as big as you can, JUST BECAUSE WE CAN!

 17th June 2010, 07:57 PM #1522 Tea-Bag   not politcally affiliated diyAudio Member     Join Date: Feb 2006 Location: Kennebunk I beleive they will all dissapate equally I believe, making it effectively a 3Watt max combo. __________________ GB 2017 #2 CLOSED, Boards on Order | Hot-Rod DCB1 boards and kits In Stock, PM | M2C Boards In Stock
regiregi22
diyAudio Member

Join Date: May 2009
Quote:
 Originally Posted by Tea-Bag I beleive they will all dissapate equally I believe, making it effectively a 3Watt max combo.
They won't, just because they have different values, so they will pass different currents.
It's easy: Power is Current times Voltage. So, having all of them the same voltage applied, what will vary is current. Then, P=VxI, will give you higher wattage consumption.
Just ohm's law.
__________________
diyAudio, doing it as big as you can, JUST BECAUSE WE CAN!

Blues
diyAudio Member

Join Date: Sep 2003
Location: The Milky Way
Quote:
 Originally Posted by Blues Alon, The power will still be distributed accordingly with the most on the lower resistance as more current is passed.
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html

 18th June 2010, 09:42 AM #1525 AndrewT   diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders the best formula for this comparison is P=V^2/R find the power dissipated by any single resistor across the 2.04V of the CCS. then total the dissipations for total losses. __________________ regards Andrew T.
 18th June 2010, 09:55 AM #1526 westers151   diyAudio Member   Join Date: Dec 2008 I just wanted to confirm my understanding of what I've read with regards to potentiometer values. Back in post #138 it was said the sweet spot was a 20K pot, but anything between 15K and 25K would work without having to change the 220K resistor value. Is a 20K pot still considered to be good? I'm looking at pairing the B1 with a ladder attenuator and if a 20K pot is still good then it opens up my choices with regards to sourcing (buy or build myself rather than just building). Thanks
 18th June 2010, 10:44 AM #1527 Salas   diyAudio Chief Moderator     Join Date: Oct 2002 Location: Athens-Greece 20k is good.
 18th June 2010, 10:47 AM #1528 westers151   diyAudio Member   Join Date: Dec 2008 Thanks.
regiregi22
diyAudio Member

Join Date: May 2009
Quote:
 Originally Posted by westers151 I just wanted to confirm my understanding of what I've read with regards to potentiometer values. Back in post #138 it was said the sweet spot was a 20K pot, but anything between 15K and 25K would work without having to change the 220K resistor value. Is a 20K pot still considered to be good? I'm looking at pairing the B1 with a ladder attenuator and if a 20K pot is still good then it opens up my choices with regards to sourcing (buy or build myself rather than just building). Thanks
yeah, 20k is still alright. Time has passed by, but the design itself remains the same
__________________
diyAudio, doing it as big as you can, JUST BECAUSE WE CAN!

 18th June 2010, 11:43 PM #1530 ClaveFremen   Reality first! diyAudio Member     Join Date: May 2005 Location: Milan, Italy Hello, in BOM a 2x12V 50VA transformer is indicated. Can a 2x12V 30VA R-Core one be suitable? Thanks in advance __________________ Dario ClaveFremen "Bailando Salsa en el Sietch"

 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 Babowana Pass Labs 328 20th February 2010 02:14 AM

 New To Site? Need Help?

All times are GMT. The time now is 03:39 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 © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.