[hpsdr] Atlas LED Markings

[David McQuate]

Hi Ken,
   Do you have a multimeter whose ohms range puts about 2 volts across 
the test leads?
I'm using a very cheap Cen-Tech digital multimeter on the 200 ohm range 
or the diode test
setting.

With no cards installed on Atlas--

Locate a row of unused vias next to the row of LEDS.  If you connect the 
negative DMM lead to
the ground pad next to the mounting hole next to c23, and connect the 
positive DMM lead to
the via next to the +12 LED it should light.  Similarly, connect the 
positive lead to the via next to
the +3.3 LED, and also to the via next to the +5v LED, and they should 
light.

Switch the DMM leads, so the positive one goes to ground and touch the 
negative lead to the vias
next to the -12 and -5 LEDS, and they should light.

If you get LED light with these polarities, the LEDs are installed 
correctly.  If you have to reverse the
DMM polarities, the LEDs are in backwards.

73,
Dave
wa8ywq

On 4/20/2012 3:19 PM, Ken Shutt wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> The Atlas Manual Rev 1.4, page 14 says that the cathodes of LEDs D1 
> thru D5 are marked with a small colored dot.  According to the 
> addendum,  the anodes are marked.  I have installed the diodes per the 
> page 14 instructions.  Is there anyway to confirm right/wrong 
> orientation without removing and probably destroying these parts?
>
> Ken - W5KQ
>
>
>
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