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Old 9th November 2012, 12:30 PM   #3601
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Quote:
Originally Posted by naf View Post
Dear MiiB, please don't get me wrong.
Why don't you provide your sim with the models for active devices ? It is impossible to help -you if we don't even know the voltage of the PSU you will use.
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Old 9th November 2012, 01:06 PM   #3602
wahab is offline wahab  Algeria
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Quote:
Originally Posted by naf View Post
,
based on ssa bjt basic please check my component value.
With no drivers for the power transistors distorsion
will be very high , something like 1% at 1Khz and 5W on 8 ohms ,
and as such it wouldnt even reach the hifi standards of the 60s....
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Old 9th November 2012, 03:27 PM   #3603
naf is offline naf  Indonesia
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Originally Posted by wahab View Post
With no drivers for the power transistors distorsion
will be very high , something like 1% at 1Khz and 5W on 8 ohms ,
and as such it wouldnt even reach the hifi standards of the 60s....
Thankyou very much Sir Wahab, i see your post about SSA Allbjt with driver, in post #196, so with my schematic above i got around 1% at 1khz? and only 5W on 8ohms?
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Old 9th November 2012, 03:52 PM   #3604
Sheldon is offline Sheldon  United States
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Quote:
Originally Posted by wahab View Post
With no drivers for the power transistors distorsion
will be very high , something like 1% at 1Khz and 5W on 8 ohms ,
and as such it wouldnt even reach the hifi standards of the 60s....
Not all distortion is created equal, so I can testify that the simple amp can sound very good at modest power levels. A bigger problem for the simple BJT version, will be getting to a stable operating point. You will need a good current source to replace the resistors R3,R5 for the front end, and you will need to incorporate LC's NTC thermal compensation scheme.

Sheldon

Last edited by Sheldon; 9th November 2012 at 03:54 PM.
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Old 9th November 2012, 04:17 PM   #3605
wahab is offline wahab  Algeria
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Quote:
Originally Posted by naf View Post
Thankyou very much Sir Wahab, i see your post about SSA Allbjt with driver, in post #196, so with my schematic above i got around 1% at 1khz? and only 5W on 8ohms?
Of course the max power is higher , in the vicinity of 50W and the 1%
distorsion is for 5W , at higher power it will rise to a few % at 16W
and so on while distorsions such as intermodulation will also skyrocket.

As said ,better to add drivers to the power devices (or use darlingtons
wich are a driver and a power transistor packed in a single case),
that s necessary to have a good enough amplifier.

There must be a variation in this extensive thread that was checked
through a build that should suit your needs.


Quote:
Originally Posted by Sheldon View Post
Not all distortion is created equal, so I can testify that the simple amp can sound very good at modest power levels.
Equal or not , without drivers it is high and i think that no one will contest this point whatever the burned to the rope "good sounding" argument...
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Old 9th November 2012, 04:51 PM   #3606
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Originally Posted by Lazy Cat View Post
Requested by many, SSA BIGBT HP, SSA CCS schematics and final product successfully made in June 2012
Hi Lazy Cat, Sorry for looking at this circuit so late in the day. Great job ! Its not over yet, according to some models, you will have many more spawns
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Old 9th November 2012, 04:51 PM   #3607
shaan is offline shaan  India
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Quote:
Originally Posted by naf View Post
Dear LC,
based on ssa bjt basic please check my component value.
Hi naf.

Good to see that you want to go further with SSA than just stop and type and discuss and etc.

Your schematic seems okay, but some points...

1. Use fixed resistors of 1K2 value in place of R3 and U2.

2. Use offset control at the input like your last SSA. Two 10K trimmers + 1uF + 1Meg. Much easier.

3. Use 10K for R17. 1K for R7. Remove R18.

4. R4 and R8 should be 1Watt type.

5. C3 in not essential. So you can omit it.

p.s. Please ignore whatever whoever says about the merits/demerits of your schematic, it's purely their own prejudice. YOU are building YOUR own amplifier, YOU decide if it sounds good or not.

All the best.
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Old 9th November 2012, 05:06 PM   #3608
wahab is offline wahab  Algeria
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Originally Posted by shaan View Post

YOU decide if it sounds good or not.

.
As last ressort negating the nature s laws....

It will have distorsion higher than 1$ chip amplifiers , whatever you decide
and the guy has the right to know it before listening to your sectarians opinions.

Last edited by wahab; 9th November 2012 at 05:09 PM.
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Old 9th November 2012, 05:25 PM   #3609
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Quote:
Originally Posted by wahab View Post
... before listening to your sectarians opinions.
Please, could-you comment your own SSA build and share your experience about-it ?
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Old 9th November 2012, 05:55 PM   #3610
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Esperado View Post
Please, could-you comment your own SSA build and share your experience about-it ?
That s not the point , the guy asked for some infos about his schematic
and he got some from different members.

As for the experience i will rely on yours instead....

Seriously , would you build for yourself what is seemingly the worst iteration
of this amp.?..

And why didnt you build this version to check if it wasnt better sounding
that what you have at hands ?.

I guess that we both know the reason , but whatever it s somewhat
strange to see people proposing to others some food that they wouldnt
even considerate for themselves.

The guy said that he s not experimented in this field , so why should
he learn the things the hard way when there s is seemingly a lot
of people that could provide him good solutions to get an acceptable
amplifier in respect of today s standards.

That wouldnt take him more efforts than be thrown wasting money and time building a version whose caracteristics are unworthy of a midi mid-fi compact stereo amp.
Quite the contrary.
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