>rlm wrote:
>>*** Approximation formulae are given in:
>>http://www.somis.org/D.amplifiers.2.html
>>The math is multification and division.
>
>Those really aren't approximation formulae. They are handy practical
>rules of thumb that often will work... but sometimes won't.
>
>Please don't get me wrong on this. Anyone who is contemplating a
>transmitter power supply ought to read Rich's page on the subject - see
>above. By all means use Rich's rules of thumb to check the transformer
>and other components that you're thinking of using... and if they don't
>check out, then it's "STOP. WRONG WAY. GO BACK" and find other
>components.
>
>But those rules of thumb still won't tell you exactly how those
>components will perform in practice. The 'PSU Designer' program *will*
>
** Ian -- Does the PSU Designer program have an entry for Mains
Resistance?. How does one measure this quantity? Thanks.
>The kinds of power supplies we're talking about here in AMPS are big,
>heavy and expensive. And when you build one, you are very literally
>building it around the transformer. If that transformer isn't suitable,
>you're almost certainly going to need a bigger one that will not fit
>into the same space. That means you'll have to scrap the whole darn
>project and start again. If the project is not only a power supply but a
>complete desktop amplifier, then you've wasted even more time, money and
>effort.
>
>Having suffered exactly those disappointments in the past, it certainly
>"cured me of my gambling ways" with transformers! I now want to be
>absolutely sure it's going to work, before going out to the workshop.
>That's why I so strongly recommend 'PSU Designer'.
>
>
>--
>73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
> Editor, 'The VHF/UHF DX Book'
>http://www.ifwtech.co.uk/g3sek
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|