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Old 14th September 2012, 10:17 PM   #1
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Default New Electrocompaniet AW120 clone

This is what I have come up with. Design is largely based on AW120, except original protection circuitry, voltage amp power supply
and a small twist on input stage biasing.

Would anyone care to comment on the pcb design, as it is getting toward completion? Left and right channel signal paths are mirrored except around the output transistors, where I have tried to keep respective trace lengths equal.
What would you do in a different way? Any other comments/ideas are welcomed.

Cheers.
Attached Files
File Type: pdf cmp_sld.pdf (151.4 KB, 410 views)
File Type: pdf marking.pdf (137.8 KB, 271 views)
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Last edited by hollow_man; 15th September 2012 at 07:14 PM.
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Old 14th September 2012, 10:21 PM   #2
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That' d be the schematic.
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File Type: pdf Schematic.pdf (78.2 KB, 494 views)
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Old 30th September 2012, 02:25 PM   #3
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Welcome
Very nice project!
I would like to ask for help
Electrocompaniet AW-180 schematics I need
Thanks for your help
my email address
gargafater@freemail.hu
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Old 16th November 2012, 06:39 AM   #4
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Quote:
Originally Posted by hollow_man View Post
That' d be the schematic.
Hello hollow_man
I saw the schematic of the amplifier and i was wondering how the feedback network from the "OutR" works. It seems it goes to a 8K2 resistor, but i would expect a second resistor from there connecting to ground. As it is now it seems like being an amplifier with 0 dB gain.
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Old 21st November 2012, 03:29 PM   #5
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Hi Powjemini,

this design is along the typical EC lines, whereby the first section of the amp operates open loop as a transimpedance amplifier with a very high output impedance. However, it 'sees' the 8K2 output section feedback resistor as its load, which establishes a given voltage gain. The output section indeed operates with 100% negative feedback, so its voltage gain is unity.
Hence you could say that the voltage gain is determined solely by the 8K2 feeback resistor (within limits).

Regards,
hollow
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Old 17th December 2012, 06:33 AM   #6
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As you may know, down here in Greece we have as of late been shattered with deep salary cuts, very steep taxation, job losses etc, so sadly I cannot proceed to the elusive construction phase...
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