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Old 16th January 2013, 12:34 AM   #1411
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Looks like spaceship or maybe a "big package"

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Originally Posted by Idefixes View Post
First try for TSSA_BIGBT_HP single layer. 165x135mm. TLP627 is not connected out for moment
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Old 19th January 2013, 10:13 PM   #1412
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Question excellent diagram

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Originally Posted by Lazy Cat View Post
This update enables TSSA BIGBT HP to be even more universal:
- serial diode MUR160 plus 22 ohm resistor in power supply rails helps to improve PSRR
- +/-OPT pins enables to connect separate power supply for the front-end (MUR160 and 22 ohm are omitted)
- power supply LED indicators for both front-end and output stage are present
- serial compensating resistor added to NTC (serves to calibrate NTC thermal response)
- serial resistors added to SK75 heatsink's GND connection (serial RC filter)
- 1 uF/63V decoupling capacitors added close to VAS transistors supply rails
- TLP627 input now accepts 12 V remote signal (serial resistor added)
- LT1034 replaced by TL431
- R2-R9 values stated for +/-50 V power supply rails

And that's about it.
I never saw such 8one amplifier, very good contribution.
Thanks Lazy Cat
Best regards Sergio.

POSTSCRIPT: Have the pcb
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Old 19th January 2013, 10:30 PM   #1413
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Talking pcb

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Originally Posted by Idefixes View Post
Definitively you have "the eyes"...frenche expression

Marc
Have the pcb in pdf format to do it in the plate method is that it is an excellent PCB. and iIn addition to the suggestions corresciones and Lazy Cat'm great.
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Old 20th January 2013, 10:25 AM   #1414
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Quote:
Originally Posted by SERGIODS View Post
I never saw such 8one amplifier, very good contribution.
Thanks Lazy Cat
Best regards Sergio.

POSTSCRIPT: Have the pcb
Yes it is nice and compact CFB amp, thanks for kind words Sergio.

Probably Marc will be the first to assemble TSSA as he already populated PCBs to certain level.
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Old 20th January 2013, 12:54 PM   #1415
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Quote:
Originally Posted by Lazy Cat View Post
Yes it is nice and compact CFB amp, thanks for kind words Sergio.

Probably Marc will be the first to assemble TSSA as he already populated PCBs to certain level.
Yes i do beut weather is against me....i wanted to populated second board and achieve first test this morning........but when i oppened yese this morning i just can cry : this night ia rain under negative tempco, i took the whole morning to scrape iced an defrost car......

Marc
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Old 20th January 2013, 03:56 PM   #1416
RNMarsh is offline RNMarsh  United States
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Quote:
Originally Posted by Joachim Gerhard View Post
I really like the basic idea of post 1.
I personally think that i can not hear better then 0,1% low order distortion so to make the circuit more complicated to get PPM distortion is not so attractive to me when it looses the simplicity.
The lower limit/threshold of hearing seems to be somewhere between .1 and .01%. So, I would make it 5-10 times better than that for each component in the 'system'... so that if the entire playback system was measured, the THD would be under that threshold. The simplist design which can do this and all other audible artifacts is the best design.
Thx-RNMarsh
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Old 20th January 2013, 04:19 PM   #1417
Salas is offline Salas  Greece
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Including the loudspeakers?
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Old 20th January 2013, 04:34 PM   #1418
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Quote:
Originally Posted by RNMarsh View Post
The lower limit/threshold of hearing seems to be somewhere between .1 and .01%. So, I would make it 5-10 times better than that for each component in the 'system'... so that if the entire playback system was measured, the THD would be under that threshold. The simplist design which can do this and all other audible artifacts is the best design.
Thx-RNMarsh
The lower threshold is indeed relatively high .. But if you have multiple components that adds 0.1% it starts to be dominant.
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Old 20th January 2013, 04:34 PM   #1419
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Originally Posted by RNMarsh View Post
The simplist design which can do this and all other audible artifacts is the best design.
We can only agree, Richard. While i believe the actual methods to measure errors are far to represent the all landscape.
It is time for a young and courageous engineer to work an a method and to propose the measurements instruments able to evaluate all the errors at once in the real music landscape.
Comparing an calculating the differences that occurs dynamically with real music, digitally and computer based.
We will loose a lot of fun, fighting in forums :-)
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Old 20th January 2013, 05:36 PM   #1420
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