[hpsdr] Hermes J16 right speaker polarity

[David R. Wilson]

Hello John,

I would take a look and see if the - line is an inversion of the
+ line for the speaker output.  Don't assume it is tied to ground.

I have not seen the schematic for that, but figured it might be worth a
look before something is damaged.

73,
Dave
KU4B


On Wed, 2013-07-31 at 15:42 -0400, John Ackermann wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> I've been warned that the J16 pinout on the Hermes schematic does not 
> match reality, and to use the photo on page 13 of the Hermes guide instead.
> 
> The guide indicates that pins 14 and 15 are the right speaker output, 
> but doesn't show their polarity.  I'd like to wire so that the the two 
> speakers are in phase.
> 
> Per the schematic, J27 (left speaker) has puts + on the tip, and - on 
> the ring, with sleeve open.  Is this correct on the assembled board?
> 
> Does anyone know which of pins 14 and 15 are positive and negative so I 
> can match the polarity for the right speaker?  From the Hermes 
> schematic, I'm guessing that pin 15 is positive and pin 14 is negative. 
>   But see the top of this message. :-)
> 
> Thanks,
> 
> John
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