[ARC5] Simple Question Arc-5 receiver power supply requirements?

[Leslie Smith]

Hello Bruce,
You write "... I can tweek the power supply [...] ratings and shave the
parts cost a little ..."

I never do this.
The cost of parts are such a small component of the final cost (and the
value of a set is so high) I wonder why anyone would not design for the
best quality, and widest operating safety margin possible?   That was
the basis for the original design.  No component in the ARC-5 is
"cheap".  This applies everywhere, even to the drawings in the ARC-5
technical manual.  Consider how much the US Navy might have saved by not
publishing, for example, the drawing showing the IF transformer
construction (etc)

-- 
  Les
  vk2bcu at operamail.com


On Thu, Dec 6, 2012, at 4:21, Bruce Long wrote:
> 
> 
> 
> Thanks to all for your very helpful and informative answers to my ARC-5
> power supply question.    
> 
> I have designed a novel - or if you prefer- strange- power supply circuit
> that will meet the requirements.  I plan to do a mechanical
> implementation that allows the power supply to plug into the dyanomotor
> deck but I also want to keep the metalworking or plastic-working
> requirements to a minimum.  It uses a $6 new stock transformer, has
> voltage regulation instead of a choke and also a HV over-current shut
> down function that among other benefits protects the HV regulator
> semiconductor pass element.  Parts are all inexpensive, widely available,
> and easily substitutable.   HV output can be easily set from about 60 to
> about 300 vdc.
> 
> With the information provided by this group I can tweek the power supply
> power/current ratings and shave the parts cost a little more.  As I said
> in my first e-mail I have several receivers I would like to get
> operational.  I intend to do pcbs and then- in my grand plan- somehow
> find the time to document the design perhaps as a ER article if they are
> interested.
> 
> Thank you for your assistance.  I'll keep the group informed of my
> progress but this is a spare time project for me over the next couple
> months.
> 
> bruce  KJ3Z
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