Power amplifier, does this circuit work?
No, there's an error in the connections to Dgts_2 (notice the extra dots on its terminals). The collector of Tt_3 should connect directly to the base of Tgts_3 &mdash; in other words, the bottom half should look like a mirror image of the top half.

It looks like the kind of error you get when editing a schematic, and you move something so that it overlaps an existing wire, creating unwanted connections.



There's also another problem: The base of Tt_1 (where did these ridiculous reference designators come from, anyway?) is connected directly to VCC, and the base of Tt_3 is connected indirectly to ground. There's no way for the input signal to reach the output stage.

My guess would be that the base of Tt_1 should be connected directly to the collector of Td_2 &mdash; i.e., at the other end of Rd_c.



With those issues addressed, it looks like the topology for a perfectly standard amplifier with output current limiting. However, I have not gone through and evaluated the component choices, operating point, etc.