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Old 18th June 2017, 01:27 PM   #2531
44250 is offline 44250  Serbia
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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.
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Old 23rd June 2017, 09:45 AM   #2532
44250 is offline 44250  Serbia
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...and here they are:
Attached Images
File Type: jpg DSC_0023.jpg (595.5 KB, 772 views)
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Old 24th June 2017, 04:56 PM   #2533
delange is offline delange  Belgium
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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.
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Old 24th June 2017, 05:08 PM   #2534
AndrewT is offline AndrewT  Scotland
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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.
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Old 24th June 2017, 09:06 PM   #2535
tiefbassuebertr is offline tiefbassuebertr  Germany
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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.
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Old 25th June 2017, 06:48 PM   #2536
delange is offline delange  Belgium
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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!
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Old 25th June 2017, 10:24 PM   #2537
apexaudio is offline apexaudio  Serbia
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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.
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Old 26th June 2017, 09:49 AM   #2538
AndrewT is offline AndrewT  Scotland
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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.
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Last edited by AndrewT; 26th June 2017 at 09:52 AM.
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Old 26th June 2017, 09:57 AM   #2539
AndrewT is offline AndrewT  Scotland
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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)
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Old 20th July 2017, 10:25 AM   #2540
behrad is offline behrad  Iran
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hi friends
i built a 2.1ch system for my com A few months ago:
2*sr100 amplis
psu-10
zobel network
+33/-33 2a traffo
1.2 kva detex smps(Under Construction)
1500w class d ampli from detex(for subwoofer)
and apex vu meter
the sound quality is very good and detailed

i have a problem
when signal source is connected and audio volume is 30% and upper sound is good and not problem but when audio volume is 0% my traffo gets hot after one hour!
why?
IMG_20170719_230430.jpg
IMG_20170719_230542.jpg
IMG_20170719_230612.jpg

respectfully
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