7353Re: [nslu2-general] Re: NSLU2 using 7805s and a 12V battery
- May 4, 2008Hi there guys,
take a tip from an old H/W engineer:
surf to the National website (www.national.com) and then go on
the webench design software. Fill in Your specs - it will
propose You an LM25576. You may have to register though.
It's not worth to try to learn the intricacies of switching
regulator design for such a simple task.
Philip Pemberton wrote:
> efilvasers wrote:
>> oabroad: a schematic and parts list would be great.
>> I've been fiddling with other ways; if I don't have the parts to make
>> a switching regulator, I'll probably use a 2N3055 with a 7805.
> Take a look at this:
> It's a two-transistor (plus three resistors, three capacitors and a Zener
> diode) switching regulator based on parts you can get from most electronics
> parts dealers. You might need to wind the inductor yourself, or steal one from
> a broken electronic device of some kind (or even a PC power supply if you have
> a broken one lying around).
> The beauty of it is that it'll work with most small inductors and is
> incredibly easy to build. It's also a nice, easy introduction to the workings
> of an SMPSU (moreso with Roman's explanation of how it all works).
> If you want more info on SMPSUs, Microchip's website has an appnote on "buck"
> switch-mode converter design -- the so-called buck topology is a voltage
> step-down type SMPSU variant (Boost is one of the other topologies, there are
> a ton of others - see
> <http://en.wikipedia.org/wiki/Switched-mode_power_supply> for a bit more info).
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