[hpsdr] Linear Power Unit (LPU)

[richardh at iinet.net.au]

Is there any provision to monitor current on the various supplies? this would 
certainly be useful in development and testing 
I would be interested in a unit. 

Richard VK6BRO 

On Wed Jan 14  6:57 , Don N6MCE  sent:

>***** High Performance Software Defined Radio Discussion List *****
>
>Thanks to all those who worked hard to bring it to this point.
>Sorry, I missed seeing the discussion on the list.
>Here are my suggestions:
>A. Mobile
>1. If C21 was increased to 25V, then the LPU would be more robust in a 
>mobile installation as it would have more protection from voltage 
>regulator transients.  I would think that using another 10uF 25V 
>capacitor, same as C1, C3, C5, C7, C9, etc would work fine.
>
>My preference is for an assembled unit.
>If it is going to be a PCB and parts kit, my preference would be to 
>build into the PCB flexible options for also using this board as the 
>regulator board in an individual custom home-brew mains power supply.
>
>To enable the option of having a pure linear supply, a -12V linear 
>regulator circuit option could be put on the PCB for us to populate, 
>which we would provide external transformer, rectifier, filter 
>capacitor.  That would accomplish being a pure linear supply.
>
>If one was going to modify the PCB anyway, for building a mains supply, 
>a common option would be using a center tapped transformer to supply the 
>+12V regulator, that could easily have a capacitor on the center tap to 
>supply the +5V and +3.3 volt regulators which would eliminate the power 
>dissipated in those dropping resistors.  This looks like it may be easy 
>to do using the R5 and R7 connection holes.
>
>I will be happy to get a LPU however it turns out.
>thank you all for the effort.
>
>73  Don N6MCE
>
>>> The LPU interest list is now active on Hamsdr. Indicate your interest, so
>>> TAPR can get a handle on how many to build. Projected price (per
>>> TeamSpeak)will be $39.00
>>> http://www.hamsdr.com/hpsdrlist.aspx\?p=7
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