[hpsdr] Fan pins on HPSDR LPU

[Scott Cowling]

Hi Jack,

J10 appears on the schematic just below F1 in the upper left corner.

Here is a link to the production schematic:
http://openhpsdr.org/support/LPU/lpu_B.pdf

In order to get voltage  to the fan connector, you must short across 
F1, which is a DNI part (normally only used if you install the 
optional 3.3V regulator parts).

So just solder a resistor lead across F1 and you will have power to your fan.

The fan is supplied with your DC input voltage, so it will be 
somewhat higher that 12.0V (typically 13.8V).  If you need 12.0V 
maximum, you will have to jumper J10 pin 2 over to U2 pin 2 (and 
leave off the jumper across F1).  This will load your 12V regulator 
with the fan current, so make sure you keep within the 2A maximum rating of U2.

73,
Scotty WA2DFI



At 12:40 2010-06-15 -0400, Jack Speer wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>I want to install a 3 pin Artic Cooler Pro TC, 92mm fan which has a 
>temperature sensor on a cable into the HPSDR Pandora enclosure.
>
><http://www.arctic-cooling.com/catalog/images/ARCTIC_F_Pro_TC_press_release_Eng.pdf>http://www.arctic-cooling.com/catalog/images/ARCTIC_F_Pro_TC_press_release_Eng.pdf 
>
>
>I have planned on using the LPU, 3 pin polarized connector I placed 
>on the LPU board per instructions (I don't see the J10 pins on the schematic).
>
>The pins do not appear to have any voltage.  The fan requires 6-12 v to run.
>
>Help please.
>
>Jack, N1BIC
>
>
>
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