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Old 24th December 2012, 06:02 AM   #3711
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WOW how many connector's pins just for a controlled inrush sequence. Over engineered?
BTW nicely put together, good job.
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Old 24th December 2012, 05:52 PM   #3712
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Smile Marry Christmas to everybody

@ LC @

I wish You a really nice day today when .... is visiting You
to bring You lot's of new & refreshing inspirations and as
we already got lot's of Yours nice 'Gifts' . . . I'm sure that more to come ...
I wish You a Marry Christmas
& the same wish to everybody here . . .

Andreas
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Old 24th December 2012, 09:42 PM   #3713
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Thanky you Andreas

Marry Christmas to you and to all dear friends from the forum.

Andrej
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Old 25th December 2012, 01:17 PM   #3714
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Quote:
Originally Posted by Lazy Cat View Post
WOW how many connector's pins just for a controlled inrush sequence. Over engineered?
BTW nicely put together, good job.

Thanks. It has not only soft start (current inrush limiting) function, but many more: 12V trigger in/out, push button switch, remote control and even option for DC detection circuit.

Another great design LC
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Old 31st December 2012, 04:58 PM   #3715
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Thanky you Andreas

Marry Christmas to you and to all dear friends from the forum.

Andrej
To All Music & Sound Lovers

I Wish a Happy New Year 2013

Andreas
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Old 1st January 2013, 09:34 AM   #3716
shaan is offline shaan  India
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HI ALL! WISH A HAPPY AND MUSICAL NEW YEAR 2013 TO ALL FELLOW DIY-ERS!
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Old 3rd January 2013, 06:06 AM   #3717
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Default Error correction

Happy new-year for all of you, SSA friends.
For this new year, would-you be interested to explore a way to reduce by ~20db the distortion of your SSA amplifier ?
(It had something to do with my (orphan) protection circuit and DC servo:
An ultimate amp protection circuit ?
No change of the amp itself, before is in red, after in green.
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Old 3rd January 2013, 06:33 AM   #3718
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Esperado View Post
Happy new-year for all of you, SSA friends.
For this new year, would-you be interested to explore a way to reduce by ~20db the distortion of your SSA amplifier ?
(It had something to do with my (orphan) protection circuit and DC servo:
An ultimate amp protection circuit ?
No change of the amp itself, before is in red, after in green.
good investigation.
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Old 3rd January 2013, 06:59 AM   #3719
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Quote:
Originally Posted by Esperado View Post
Happy new-year for all of you, SSA friends.
For this new year, would-you be interested to explore a way to reduce by ~20db the distortion of your SSA amplifier?
Happy New Year dear Esperado.

Of course I/we would be interested for great improvement, if such good idea is wise to reveal at all. Maybe you could make more out of it if not publish it here but rather in good idea's office.
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Old 3rd January 2013, 08:01 AM   #3720
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Time out for suspense :-)
It used an idea i had several years ago, refreshed by the reading of: http://hifisonix.com/wordpress/wp-co.../AFEC-V1.0.pdf (By one of our good members: Bonsai).

I had set-it for exploration with those concerns:
Use of OPAs in current-feedback, to stay in the SSA spirit :-) and because we need here very fast OPA, to reduce HF phase errors as much as possible.
This imply the Amp Out had to be plugged in the - side (low impedance) of the comparator (U2). So we will need to invert the phase of the result with the next OPA (U1) .
Of course, you can use a very fast voltage feedback OPA as well, but they are harder to find.
The gain of the firt OPA is st to go near the rails with the max input signal's level. This, in order to minimize the clipping bad behavior of this Error correction technology. But a hard clipping before the input would be a good (better) response too.
The R10 has to be carefully adjusted in order to minimize the output level at 100 Hz (to avoid any phase problem). In real life, it will be a trimer.
Then, at 3Khz, C22 has to be adjusted to reduce the same level (compensation of the Power amp's delay at HF).
At the end, you will adjust the overall gain of U1 to get the best distortion/ stability result.
It is possible to go further, but it will be a little tricky.

The overall idea is to isolate the distortion, comparing out and in of the power amp, like in my protection circuit. This error will be added in the feedback loop, reducing further the original distortion without changes of the overall open loop and closed loop gain.
An other advantage is this will help to set the offset, as it works like a DC servo.
Do not care about some strange useless resistances here or here, they are to help-me to explore different things and cut some wires easily.

Up to you all to play with this idea.
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Last edited by Esperado; 3rd January 2013 at 08:17 AM.
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