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Old 13th April 2012, 09:29 AM   #71
sonnya is offline sonnya  Denmark
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I would remove the Caps marked with red. At high frequencies they will feed noise through.
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Old 13th April 2012, 09:41 AM   #72
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I agree sonnya

Any more suggestions? As that would brings us to an optimal consensus version.
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Old 13th April 2012, 09:48 AM   #73
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In TSSA I will use these two BIGBT output beauties.
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Old 13th April 2012, 10:46 AM   #74
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Hi, LC could adapte the TSSA HP for +/-50Vdc? It would be really nice from you.

For fun il will try the liitle pcb for TSSA TT.

Marc
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Old 13th April 2012, 11:10 AM   #75
AndrewT is offline AndrewT  Scotland
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the simplest !

post71 shows ~75 components.
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Old 13th April 2012, 11:12 AM   #76
Salas is offline Salas  Greece
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Testing/ironing out TSSA BIGBT, allowing/confirming a range of PSUS 45V-70V and issuing a board would be a happy practical conclusion of the Andrej ideas threads. What is the projected power range for those supply voltages?
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Old 13th April 2012, 11:29 AM   #77
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by Lazy Cat View Post
In TSSA I will use these two BIGBT output beauties.
At low power category the SSA will face a very tight competition with other class-A amps. And especially the BIGBT output may not be suitable for this kind of competition. But at high power category (class-AB) the SSA may become a winner.
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Old 13th April 2012, 02:41 PM   #78
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Quote:
Originally Posted by AndrewT View Post
the simplest !

post71 shows ~75 components.
This one is HP-high performance version, based on TSSA, logically that it has more components, performing specialized jobs.

The only one named the simplest-TSSA from post #1 has 17 parts all together, successfully tested by sonnya.

Exact essence of this and SSA thread lies in Salas words:
Quote:
Originally Posted by Salas View Post
Testing/ironing out TSSA BIGBT, allowing/confirming a range of PSUS 45V-70V and issuing a board would be a happy practical conclusion of the Andrej ideas threads.
All varieties of the SSA circuit has the purpose of thread evolution and maybe, I say maybe, from all the posts we'll squeeze out only one little diamond.
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Old 13th April 2012, 02:54 PM   #79
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Hi LC, what is the +/-Vdc rail limit to use with #57 schématic?

Marc
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Old 13th April 2012, 03:21 PM   #80
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Quote:
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Hi LC, what is the +/-Vdc rail limit to use with #57 schématic?

Marc
Definitive limiting factors are BC550/560 Uce max. and their power dissipation. Power transistors can take into/from their bases 100 mA and more, and that can be well over BC's capabilities especially if you consider SOAR. BC's can be replaced with 2SA/SC TO-126 transistors but with a little decrease in HF and noise performance. These four BJT-s are major limiting factor, also with only one output pair you can not expect to get out more than 50 Wrms/4 ohm load by any BJT selection. Please try by yourself to calculate BC's dissipation in the worst case conditions and you will see.

Lateral mosfet version has a little more headroom, but charging gate input capacitance at HF is another difficult task. Still no more than 50 W/4 ohm full power bandwidth .

Last edited by Lazy Cat; 13th April 2012 at 03:24 PM.
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