2stageEF high performance class AB power amp / 200W8R / 400W4R

[Agus sugiono]

See post #1.

thank you,, I will try the simulation, because I'm still learning

 

[Agus sugiono]

See post #1.

Sir, can I send the asc file to your personal?

 

[printnik]

how to run 2 stageEF_class_AB asc?

You can download the program, download the archive with libraries that are circled with a red line in the figure and click on the RUN icon. But this is probably an old version of the amplifier file. Ask the author for a new one, because when overloaded, Q6 will emit magical smoke if its current and voltage are not limited.

 

[astx]

Always have a detailed look at the index in post #1 - see project A which has a link to post #1149 to the latest asc version of 2stageEF_3.4.2.zip
BR, Toni

 

[astx]

Just tried the zip content from post 1149 with the newest LTSpice version 17.1.5 fresh installed in a new Linux-Wine directory (= behaves like a fresh installed windows 7)

My directory content:
-rw-r--r-- 1 toni users 1493 11. Aug 2014 2SC5200_2SA1943.lib
-rw-r--r-- 1 toni users 49903 3. Aug 2014 2stageEF_class_AB_power_amplifier_v3.asc
-rw-r--r-- 1 toni users 2959 11. Aug 2014 2stageEF_class_AB_power_amplifier_v3_soa_drv.plt
-rw-r--r-- 1 toni users 19947 1. Aug 2016 Cordell-Models.txt
-rw-r--r-- 1 toni users 838 11. Jän 2014 KSC3503_KSA1381.lib
-rw-r--r-- 1 toni users 9960 26. Mai 2014 mylibs.lib

You need only the File "Cordell-Models.txt" which can be downloaded here.

printnik: you are right. This is an old version and Q6 would burn on overload. See attached sim result picture of the latest asc

BR, Toni

 

[Agus sugiono]

how to find out or change RTMC, RTPC, Rm values?

 

[astx]

RTMC, RTPC and RMC are switches to control
transitional miller compensation, two pole compensation or miller compensation.

please do not post more questions about simple ltspice handling in this thread.

 

[astx]

Had some time to work on the SA2021 new class H version. Hmm - I got the pcb's in 04/2021 - more as 2 years the project has had to wait for continuation. ( )
Currently waiting for some SK76 heatsinks which are 37mm high...
Heatspreaders are machined, LTP BJT, VAS BJT, IXYS MOSFETs and TTC5200/TTA1943 are already matched...
Two new 800VA toroids (2x16V, 2x55V) are on stock...

Have fun, Toni

 

[astx]

All transistors matched/collected. Still waiting on some SK76 heatsinks ...

 

[rolandong]

Looking really good as it gets better and better.
I would love to see your result perhaps this is one of the best thread in solid state.

 

[inyashd]

All transistors matched/collected. Still waiting on some SK76 heatsinks ...

Waiting for Class H version 👍

 

[astx]

... some progresss ...

 

[astx]

... ready for testing.
Used Kerafol U90 for transistor mount (6W/mK).

First results expected this weekend. Hopefully no holy smoke...


Have fun, Toni

 

[astx]

Both channels are working out of the box!
supply: 2 x 20V and 2 x 31V
Quick and dirty setup: bias set to oliver voltage (~42mV across emitter resistors) and done first measurements:
0.003 % THD+N at 1kHz ~ 12V RMS @ 8R, bw 80kHz
0.006 % THD+N at 20kHz ~ 12V RMS @ 8R, bw 80kHz
This is measured at the critical supply crossover region where the "high voltage" supply steps in.
SA2021 NewClassH is working as expected! Again this smile:

BR, Toni

 

[inyashd]

👍 congrats

 

[inyashd]

Waiting for more details, BOM & setup

 

[thimios]

Respect Toni!!!

 

[astx]

... prepared power supplies for extended testing ...
Lethal DC voltages: +/- 80V
Second smaller supply is +/-20V

 

[inyashd]

Two power supply separate
board

 

[diyralf]

Grand Battle Day for Toroidy