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
 9th May 2012, 08:24 PM #1 Dr Zeus   diyAudio Member     Join Date: Oct 2010 ADS A/D/S P640 Repairing this amp for a friend because it was poping 30A fuses. I found one of the two rectifiers shorted internally so I replaced both of them. Amp now powers and plays on all channels, but the rail voltage is just a meer +-22vDC. Is that too low for this amp? Regulated voltage is ok (about +-15V) __________________ | Fluke 10 | Ramsey BS-601 | Topward 8102 | RS MiniAmp | Pyramid PS-15KX | DieHard |Big A\$\$ Resitor | Last edited by Dr Zeus; 9th May 2012 at 08:26 PM.
 9th May 2012, 11:13 PM #2 1moreamp   diyAudio Member   Join Date: Dec 2005 Location: Northern California ADS wasn't known for high voltage power amps, so unless the replacement diodes have some unusual Voltage drop issues its likely a acceptable rail supply for a 6 times 40 watt amp. If in doubt you could always setup a simple resistive test loads and scope the output of the amps channels into those loads driven by a clean sine wave just below clipping on the scope and measure the RMS AC voltage across the loads and use ohms law to calculate its power level. Here is a link to a online ohms law math calculator: Ohm's Law Calculators P = E 2 / R
 12th May 2012, 05:43 AM #3 JLH   diyAudio Member     Join Date: Apr 2005 Location: Indianapolis, IN That's about right for a 40Wrms per channel amp. Since it is a class A/B amp you can only get within about 4 volts of each rail before clipping sets in. So this is what I come up with for +/-22V rails: (44V - 8V) = 36Vpp 36Vpp = 12.7278Vrms 12.7278Vrms/4 ohms = 3.18195Arms 12.7278Vrms*3.18195Arms = 40.499Wrms Looks about right to me. __________________ Ah, how beautifully the orchestra sounds before a rain! In a dry sunny day there is no way for the instruments to sound this way!

 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 mike49504 Car Audio 27 1st March 2010 08:34 AM mike49504 Car Audio 8 8th October 2008 09:25 PM mike49504 Car Audio 1 5th September 2008 08:07 PM mike49504 Car Audio 3 8th August 2007 02:11 AM markp Multi-Way 0 15th December 2004 11:16 PM

 New To Site? Need Help?

All times are GMT. The time now is 09:27 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.