Hello John
You are right, there are some errors in the schematic.
I uploaded the new corrected one along with the missing components files : AmpJCA.zip.
I hope that this time the schematic is correct.
Meanwhile I received 2 models of mps4250. Simulations with one of them and with BC557
give very different results. Which one is true ? LTSpice's one - BC557B or BC557C - I guess.
In fact results are very dependent of model's parameters.
Besides, I don't know if it's important but on my amp, U2 is CNY17-4 which is not present in LTSpice's OPTOS.
What I woud like to understand is HOW to equilibrate the voltages at the collectors of Q12 and Q13 to get quite the same current at R101 and R111.
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--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:
--- In LTspice@..., abeill?? jean-claude <jean_claudeabeille@> wrote:
Thank you for the tutorial, I wouldn't have found out in what
folder - temp - to store the file.
OK, it's done, file name is AmpJCA.asc.
Hello Jean,
The circuit had a lot of mistakes. I tried to correct them.
Please watch all the circles and my other comments in the
schematic. My files:
Files > Temp > AmpJCA_1.zip
I have used most of the missing transistor models from
bordodynov's file standard.zip.
Over all we don't want discuss the design of audio amplifiers
in the LTspice Yahoo group. You should do that in DiY-Audio
groups. There are also books about audio amplifiers, e.g.
this one from Cordell, .
Best regards,
Helmut
