Ampli EPAM 75

Dori · 9th February 2005, 03:50 PM

Good morning everybody..

I am an electronics engineer but in fact I am quite a newbie in amplifier design. I am working on EPAM amplifier because it doesn't work anymore.

I try to simulate it with Protel 99SE tool but in fact errors occur while running.

Indeed, I just want to have the op analysis, so set the input to 0. The supply is +32V -32V.

The errors are Warning: singular matrix: check nodes netq11_3 and netq11_3

Note: starting Gmin stepping
Warning: Gmin step failed
Warning: Gmin stepping failed
Note: starting source stepping
Warning: source stepping failed
doAnalyses: Matrix is singular

run simulation(s) aborted

Could you help me please ?

ChocoHolic · 9th February 2005, 06:07 PM

Hi Dori!

I guess protel is not very popular here.
Also I am not using it.

If I am right the EPAM is a modular design.
-One supply modul.
-Left chanel modul.
-Right chanel modul.

If you only need the operating points, I would propose
that you compare the defect chanel with the proper chanel.
If both chanels are not working, then probably the supply modul is
defect.

Good Luck
Markus

9th February 2005, 03:50 PM	#1
Dori diyAudio Member Join Date: Feb 2005 Location: Le Pradet	Ampli EPAM 75 Good morning everybody.. I am an electronics engineer but in fact I am quite a newbie in amplifier design. I am working on EPAM amplifier because it doesn't work anymore. I try to simulate it with Protel 99SE tool but in fact errors occur while running. Indeed, I just want to have the op analysis, so set the input to 0. The supply is +32V -32V. The errors are Warning: singular matrix: check nodes netq11_3 and netq11_3 Note: starting Gmin stepping Warning: Gmin step failed Warning: Gmin stepping failed Note: starting source stepping Warning: source stepping failed doAnalyses: Matrix is singular run simulation(s) aborted Could you help me please ?

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9th February 2005, 06:07 PM	#2
ChocoHolic diyAudio Member Join Date: Dec 2003 Location: Munich	Hi Dori! I guess protel is not very popular here. Also I am not using it. If I am right the EPAM is a modular design. -One supply modul. -Left chanel modul. -Right chanel modul. If you only need the operating points, I would propose that you compare the defect chanel with the proper chanel. If both chanels are not working, then probably the supply modul is defect. Good Luck Markus