100w amplifier with a single pair of 2SC5200 and 2SA1943

[rafaelct]

Partiendo de una potencia de +-45 V, me gustaría armar un amplificador de 100 w con un solo par de 2SC5200 y 2SA 1943. ¿Me pueden recomendar un esquema fiable? Adjunto algunos esquemas que he encontrado de los cuales no tengo opiniones. Serían con solo un par de transistores de salida. Gracias.

 

[steveu]

"Starting from a power of +-45 V, I would like to put together a 100 w amplifier with a single pair of 2SC5200 and 2SA 1943. Can you recommend a reliable scheme? I attach some schemes that I have found of which I have no opinions. They would be with only a couple of output transistors. Thank you."

Attachments​

1. A single pair of C5200/A1943 is asking for failure with a ±50V supply.
2. Tip41/42 are too slow for drivers.
3. Separate 100 Ohm resistors to turn off the outputs is too slow and asking for shoot-through current failure. They should be cross-coupled.
4. While VI protection can cause issues, you should at least have current limit protection.
5. A current mirror on the LTP is better for turn-on/off thumps as well as general performance.
6. Especially with a current mirror, the LTP needs to be degenerated to reduce slew distortion.
7. A Darlington VAS improves THD. See Douglas Self's web site.
8. The feedback decoupling cap should be voltage clamped.
...

 

[minek123]

For 100W you need 2 pairs of output transistors.

 

[stocktrader200]

You need 2 pairs of outputs for loads lower then 8 ohms.

 

[Cal Weldon]

English please.
Add a translation if you wish to also post in another language.
Thank you.

 

[crispycircuit]

Go for 2 pair, so it can handle a 4ohm load....

 

[rafaelct]

"Starting from a power of +-45 V, I would like to put together a 100 w amplifier with a single pair of 2SC5200 and 2SA 1943. Can you recommend a reliable scheme? I attach some schemes that I have found of which I have no opinions. They would be with only a couple of output transistors. Thank you."

Attachments​

1. A single pair of C5200/A1943 is asking for failure with a ±50V supply.
2. Tip41/42 are too slow for drivers.
3. Separate 100 Ohm resistors to turn off the outputs is too slow and asking for shoot-through current failure. They should be cross-coupled.
4. While VI protection can cause issues, you should at least have current limit protection.
5. A current mirror on the LTP is better for turn-on/off thumps as well as general performance.
6. Especially with a current mirror, the LTP needs to be degenerated to reduce slew distortion.
7. A Darlington VAS improves THD. See Douglas Self's web site.
8. The feedback decoupling cap should be voltage clamped.
...

Would this design fit the characteristics you mentioned?

Thank you

 

[WhiteDragon]

Would this design fit the characteristics you mentioned?

And likely few hundred more versions.
Very common topology.
People would change few things here and there.
But for the most part would work.
Or a final design would be similar.

Has VI limiters
which many would leave out.
Depends on application.
Few strange values here and there.

Sure others will post more eventually.

 

[rafaelct]

Thank you, I want to use it as the final stage of a combo for electric bass. I will wait for possible corrections or contributions.