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Old 22nd April 2012, 01:01 PM   #591
AJT is offline AJT  Philippines
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Quote:
Originally Posted by AndrewT View Post
11volts of sag on the PSU when driving rated impedance/resistance to maximum rated power does not meet my standards. Then you have to make a correction for the increased ripple due to the full power current demand and you will probably find that the available voltage from the PSU at it's minimum is 12 to 13V below the quiescent voltage.

If an amplifier sags by 20 or 30V at maximum rated power into rated impedance/resistance then in my opinion it does not meet any Power Amplifier Standard. As I said not fit for purpose.

you don't seem to know.....show me the standards.....ah, it's your opinion only.....

an ideal power transformer will have zero dc resistance and zero leakage resistance....but such transformer do not exist in real world....it is only in your imagination.....
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Old 22nd April 2012, 01:05 PM   #592
AJT is offline AJT  Philippines
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I completely disagree.

It tells me that the amplifier can. or cannot, or somewhere in between, deliver load current. Maybe it doesn't tell you.
it looks like you haven't built any transformer and a lot of amps.....then you will know....
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Old 22nd April 2012, 02:35 PM   #593
AndrewT is offline AndrewT  Scotland
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I have never built any transformers.
I have modified many transformers.
I have built many Power Amplifiers.
I am starting to get a handle on which parameters in which components lead to some of the sound reproduction qualities.

I have never claimed that an ideal transformer exists in real equipment.
I don't know why you bring in the herring to your argument. It devalues what you have to contribute.
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Old 22nd April 2012, 11:41 PM   #594
AJT is offline AJT  Philippines
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Quote:
I have never claimed that an ideal transformer exists in real equipment.
but that is the message you seem to project in your posts.....

real transformers have finite dc resistances and leakage inductance's.....so that when current flows thru its coils there is voltage drop, that is the nature of the beast....

now as to what drop is acceptable or not, i haven't seen any standards, if you know such please post it here....

all i know is that on full power testing for 5 minutes, the amplifier must survive it without getting burned down....

i have asked the question on power transformer size for power amplifiers in forums before, the answer i got that stuck in my head was, "get the biggest transformer that will fin in your box"......
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Old 23rd April 2012, 10:30 AM   #595
AndrewT is offline AndrewT  Scotland
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but that is the message you seem to project in your posts.....]
your conclusion is wrong.
For details go back to "my opinion" in post576 and read on.

And to save you calculating/guessing, that's a voltage loss of ~8.55V for the combined PSU and amplifier.
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Last edited by AndrewT; 23rd April 2012 at 10:34 AM.
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Old 23rd April 2012, 06:30 PM   #596
comasus is offline comasus  India
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Hi!Mile

how to add short circuit protection for sr200
and where is the pcb and component layout

Last edited by comasus; 23rd April 2012 at 06:36 PM.
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Old 5th May 2012, 01:18 PM   #597
nix is offline nix  Philippines
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Quote:
Originally Posted by alex mm View Post
..... Revised PCB this time , much better I hope ....



Hi Mr Apex Sir,
i try this pcb layout #145 but i have problem i got -48vdc at the output using 35 0 35 VAC trafo. I replace bc550 and bc560 to mpsa92/42 and mount in reverse position. sorry i dont have picture of my work. hope you can give me hint/clue on what could be the problem of my work if there is presence of high DC volts on output. thanks in advance.


these are the picture of my work..

SR200 - Photobucket Groups

regards,
nix
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Old 5th May 2012, 01:35 PM   #598
naf is offline naf  Indonesia
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@nix
are you forgot to connect input signal ground to psu ground?
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Old 5th May 2012, 01:47 PM   #599
nix is offline nix  Philippines
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@nix
are you forgot to connect input signal ground to psu ground?
No..Those black wire was connected to psu ground. I have plan to re do my work make another pcb by tomorrow. By the way thanks for your reply.

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Old 5th May 2012, 01:51 PM   #600
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Hi Naf...
How is your SR progress ? I am looking forward to hear about it..You won't be disappointed
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