TSSA - The Simplest Symmetrical Amplifier

[sonnya]

I would remove the Caps marked with red. At high frequencies they will feed noise through.

[Lazy Cat]

I agree sonnya

Any more suggestions? As that would brings us to an optimal consensus version.

[Lazy Cat]

In TSSA I will use these two BIGBT output beauties.

[Idefixes]

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

[AndrewT]

the simplest !

post71 shows ~75 components.

[Salas]

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?

[Jay]

Originally Posted by Lazy Cat

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.

[Lazy Cat]

Originally Posted by AndrewT

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:

Originally Posted by Salas

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.

[Idefixes]

Hi LC, what is the +/-Vdc rail limit to use with #57 schématic?

Marc

[Lazy Cat]

Originally Posted by Idefixes

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 .