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Old 9th February 2005, 03:50 PM   #1
Dori is offline Dori  France
diyAudio Member
Join Date: Feb 2005
Location: Le Pradet
Default 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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Old 9th February 2005, 06:07 PM   #2
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

Good Luck
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