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JLesterP 25th June 2013 07:44 AM

Mini My Ref Rev C
4 Attachment(s)

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.

linuxguru 25th June 2013 07:53 AM

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.

JLesterP 25th June 2013 09:33 AM

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 :)

JLesterP 29th June 2013 01:54 AM

2 Attachment(s)
Top layer for double sided pcb

AndrewT 29th June 2013 08:49 AM

Pin5 desperately needs decoupling. The trace is far too long.
Are you not a believer in MF and HF decoupling?
You have none !

JLesterP 29th June 2013 10:04 AM

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)

JLesterP 29th June 2013 02:57 PM

3 Attachment(s)
As requested.

AndrewT 29th June 2013 03:05 PM

Still no HF decoupling.
National, for all their misguided information, do tell builders to include both MF and HF decoupling.

JLesterP 29th June 2013 03:40 PM

Hi, you can put it on the underside of the 220uf caps

AndrewT 29th June 2013 05:34 PM

Underside, yes.
But NOT on the electros.
At the chip pins and to Power Ground.

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