Studio Reference Amplifier - Page 254 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Reply
 
Thread Tools Search this Thread
Old 18th June 2017, 12:27 PM   #2531
44250 is offline 44250  Serbia
diyAudio Member
 
44250's Avatar
 
Join Date: Jan 2011
Location: Ugrinovci-Zemun-Belgrade-SERBIA
Send a message via AIM to 44250
I have sent pcb-lay files of latest SR300 with minor changes to be etched by a friend of mine. I have checked it one more time and it seemed all right. as soon I assemble it I will post results.
  Reply With Quote
Old 23rd June 2017, 08:45 AM   #2532
44250 is offline 44250  Serbia
diyAudio Member
 
44250's Avatar
 
Join Date: Jan 2011
Location: Ugrinovci-Zemun-Belgrade-SERBIA
Send a message via AIM to 44250
...and here they are:
Attached Images
File Type: jpg DSC_0023.jpg (595.5 KB, 264 views)
  Reply With Quote
Old 24th June 2017, 03:56 PM   #2533
delange is offline delange  Belgium
diyAudio Member
 
Join Date: Jan 2012
Location: De Parel van het Pajottenland
I'm preparing to build the SR200 amplifier.
This is a rather lengthy thread and can't find all relevant information.
As far as I understood, these are the specs:

* 200 watts / 8 ohm
* Suggested supply is +/- 65 volts (max = +/- 70 volts)

Question: what is the rated output power at 4 ohms when using a dual 65 volts supply?

Really looking forward to the build.
  Reply With Quote
Old 24th June 2017, 04:08 PM   #2534
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
dual 35Vac gives ~+-50Vdc and that allows ~200W into 4ohms.
dual 40Vac gives ~+-58Vdc and that allows ~160W into 8ohms.
dual 45Vac gives ~+-64Vdc and that allows ~220W into 8ohms.

The only combination driving 4ohms that stays within the 200W limit is with the 35Vac transformer.
__________________
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote
Old 24th June 2017, 08:06 PM   #2535
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by apexaudio View Post
DC protect with triac without diac.
several years ago I have create the schematic for Linn's power amp modell "KLOUT" - go to the pdf file No 3-6 (post #51) under
tweaking classic Linn LK1 & LK2 / LK280
maybe interesting ideas for various kind of protecting together with serial voltage regulation.
  Reply With Quote
Old Yesterday, 05:48 PM   #2536
delange is offline delange  Belgium
diyAudio Member
 
Join Date: Jan 2012
Location: De Parel van het Pajottenland
Quote:
Originally Posted by delange View Post
I'm preparing to build the SR200 amplifier.
This is a rather lengthy thread and can't find all relevant information.
As far as I understood, these are the specs:

* 200 watts / 8 ohm
* Suggested supply is +/- 65 volts (max = +/- 70 volts)

Question: what is the rated output power at 4 ohms when using a dual 65 volts supply?

Really looking forward to the build.
Hi Mister Apex,

Is the above assumption about power supply rail correct?
And what is the output power at 4 ohms?

Thank you!
  Reply With Quote
Old Yesterday, 09:24 PM   #2537
diyAudio Member
 
apexaudio's Avatar
 
Join Date: Feb 2010
Location: Serbia
Quote:
Originally Posted by delange View Post
Hi Mister Apex,

Is the above assumption about power supply rail correct?
And what is the output power at 4 ohms?

Thank you!
The output power at 4 ohms is 320W with +/-70V but I suggest to use +/-60V with 4 ohms load and power will be 240W with proper heatsink.
Regards
  Reply With Quote
Old Today, 08:49 AM   #2538
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
240W into 4r0 is ~43.8Vpk.
If using a supply rail that sits at +-60Vdc when quiescent current is flowing then that leaves a margin for PSU sag and losses through the amplifier of 60-43.8V = 16.2Vdrop
In my opinion that indicates a badly built amplifier or using an amplifier for a load that is lower than the rated load.

I would expect a good power amplifier to drop between 5Vlost and 10Vlost from the quiescent supply when delivering maximum power to the rated load

I reported figures for a Leach clone many years ago running on a 40Vac transformer with supply rails sitting at +-58.5Vdc and the maximum output (unclipped) was over 300W into the resistive dummy load.
But the amplifier was not rated for that 4ohms load, at best it was rated for a 6ohms reactive load and I used it on 8ohms speakers only where it achieved >170W into 8r0.
__________________
regards Andrew T.
Sent from my desktop computer using a keyboard

Last edited by AndrewT; Today at 08:52 AM.
  Reply With Quote
Old Today, 08:57 AM   #2539
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by delange View Post
Hi Mister Apex,

Is the above assumption about power supply rail correct?
And what is the output power at 4 ohms?

Thank you!
use your calculator.
P = I*V = I^2*R = V^2*R
P=Ipk*Vpk/2 = Ipk^2*R/2 = Vpk^2/R/2
This last version: P=Vpk^2/R/2, when rearranged gives Vpk=sqrt(P*R*2)
__________________
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote

Reply


Hide this!Advertise here!
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Crown Studio Reference I: beefing up the power supply elac310 Power Supplies 4 28th April 2010 12:50 AM
Reference Amp for studio exhausted mule Solid State 0 5th June 2006 05:39 AM
studio amplifier project? rotation Chip Amps 2 2nd February 2006 04:33 AM
Any website reference for diy Audio Research REFERENCE amp and Manley Studio amp bmpa Tubes / Valves 4 19th April 2004 05:11 AM
Any information , website reference for diy Hi-End computer studio sound card? bmpa Digital Source 5 16th April 2004 04:57 PM


New To Site? Need Help?

All times are GMT. The time now is 03:13 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki