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Old 25th June 2013, 07:44 AM   #1
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Join Date: Sep 2010
Location: Quezon City
Default Mini My Ref Rev C

Hi,

I've created a layout for a mono amp based on My Ref Rev C.

No speaker protect and no onboard supply. Only good as an add-on module for an existing amp.

Credits to Mauro Penasa for the schematics.
Attached Images
File Type: png myminiref.PNG (25.0 KB, 916 views)
Attached Files
File Type: pdf MyRefC-Jlester-Bottom (1.965 x 2.625).pdf (13.0 KB, 96 views)
File Type: pdf MyRefC-Jlester-Schem.pdf (14.9 KB, 207 views)
File Type: pdf MyRefC-Jlester-All(values).pdf (33.1 KB, 112 views)

Last edited by jlester87; 25th June 2013 at 07:46 AM.
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Old 25th June 2013, 07:53 AM   #2
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Thanks for the layout and the concept. However, it's prudent not to omit the speaker protection - there are a wide variety of situations (both malfunctions as well as marginal component values) in a MyRef where the speaker output latches to V+ or less commonly, to V-, and this will almost certainly destroy any woofer instantly.

The speaker protection circuitry works very well to protect the speakers from DC on the output, and doesn't cost much or occupy a great deal of board area, and I would strongly suggest that it be retained.
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Old 25th June 2013, 09:33 AM   #3
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Thanks for the suggestion. But the placement and routing for the speaker protect will be difficult and needs many jumpers.

Yes I think it is mandatory to have a speaker protection with this amp. Just use external speaker protect
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Old 29th June 2013, 01:54 AM   #4
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Top layer for double sided pcb
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File Type: png lm3886.png (44.5 KB, 836 views)
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File Type: pdf MyRefC-Jlester-Top (1.965 x 2.625).pdf (23.2 KB, 33 views)
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Old 29th June 2013, 08:49 AM   #5
AndrewT is offline AndrewT  Scotland
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Pin5 desperately needs decoupling. The trace is far too long.
Are you not a believer in MF and HF decoupling?
You have none !
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Old 29th June 2013, 10:04 AM   #6
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Thanks for the suggestion. No prob, the trace can be cut off and you can put jumper directly to the pins 1 and 5 of the IC. (If you're a believer)

Last edited by jlester87; 29th June 2013 at 10:08 AM.
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Old 29th June 2013, 02:57 PM   #7
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As requested.
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File Type: png 3886.PNG (63.7 KB, 778 views)
File Type: png bot.PNG (44.9 KB, 731 views)
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File Type: pdf MyRefC-Jlester-Bottom (1.965 x 2.625).pdf (16.7 KB, 26 views)
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Old 29th June 2013, 03:05 PM   #8
AndrewT is offline AndrewT  Scotland
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Still no HF decoupling.
National, for all their misguided information, do tell builders to include both MF and HF decoupling.
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Old 29th June 2013, 03:40 PM   #9
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Hi, you can put it on the underside of the 220uf caps
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Old 29th June 2013, 05:34 PM   #10
AndrewT is offline AndrewT  Scotland
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Underside, yes.
But NOT on the electros.
At the chip pins and to Power Ground.
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