[Milsurplus] BC-611 power

[Bob Camp]

Hi

If you go SMT do you go to BGA's and CSP's? If you do then it's off  
to a board house to stuff them. If you stick with leaded parts that  
rules out a *lot* of the good stuff out there.

A few suggestions:

	Needs to run off of a 2:1 voltage input range

	Output voltage set via an easy parts change over a reasonable range  
(80 to 120 volts ?)

	Needs a keying line

	Low current drain in shutdown

	Very low RFI / EMI (Do we allow modern switchers running at 5 or 10  
MHz?)

	All the parts used must be "stock" at Digikey or some such place.  
That includes the inductors.

Lots to think about....

Bob


On Feb 14, 2007, at 10:17 PM, Richard Arland, W3OSS wrote:

> OK...gang....
>
> Let's brainstorm this project so I can present some information to  
> Dave and
> his undergrads.
>
> What do we really want? Need? Why type of input voltage do we start  
> with?
> Physical size? SMD or thru hole?
>
> 73 Rich
>
> ----- Original Message -----
> From: "Bob Camp" <ham at cq.nu>
> To: "J Forster" <jfor at quik.com>
> Cc: <milsurplus at mailman.qth.net>
> Sent: Wednesday, February 14, 2007 9:39 PM
> Subject: Re: [Milsurplus] BC-611 power
>
>
> |
> | Hi
> |
> | I agree that a "simple" high voltage converter makes the most sense.
> | One issue would be that there's a big difference in the design if it
> | runs off of 1.2 volts than if it runs off of 12. The higher the  
> input
> | voltage the easier it's going to be to make the output voltage ....
> |
> | Bob
> |
> |
> |
> | On Feb 14, 2007, at 9:12 PM, J Forster wrote:
> |
> | >    From: "Richard Arland
> | >
> | > Hi John:
> | >
> | >  Thanks for the input. My thoughts were originally to have them  
> make
> | > separate
> | >  dc-to-dc converters for each radio, but then, after reading your
> | > post,
> | > I
> | >  think that maybe a generic converter might be a better idea.  
> One that
> | > would
> | >  put out 1.5, 3, 6.3 & 12 V dc for filaments,
> | >
> | >
> | > Actually, I did not suggest making filament voltages by  
> conversion.
> | > IMO,
> | > it's pointless as most sets can be run on 1 to 8 dry cells (C or
> | > D). No
> | > converter is 100% efficient and why waste up to 50% of your  
> battery
> | > life
> | > making useless heat?  It only makes sense if you are going to  
> use a
> | > car
> | > battery or some such the primary power source.
> | >
> | > -John
> | >
> | >
> |
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