adapting 12vdc to 9vdc

is an adjustble 3A buck regulator for less than $5. It's a switch mode power supply, so it won't generate a lot of waste heat.

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You can't have a sense of humor, if you have no sense.

and more searching on ebay for "LM2596" gives you the same board for $2.5 shipped ... and agree it does not generate waste heat ! but they don't seems to search for a smart solution...

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Kripton

the ESR Repository @ http://kripton2035.free.fr/esr-repository.html
the Geiger Repository @ http://kripton2035.free.fr/geiger-repositor.html

Whatever. A simple, adjustable switcher that doen't need any design work to use is a good idea for people who aren't equipped to design a power supply from scratch.

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You can't have a sense of humor, if you have no sense.

And those who think they can't etch a circuit board, order the parts from Digikey at single unit prices plus shipping, build/test it for less than $2.50.

Just because you can, doesn't mean you should.

Is

and

the

Unless you plan on building a lot of them. I've worked in electronics manufacturing, and it's not as simple as most people think. We had three reflow ovens, a preheat cabinet and a 10 * 40 foot room where boards were cleaned. First, in a commercial board washer, then inspected and cleaned by hand, if needed. Most components don't go cheap, if you buy under 1000 at a time. Some at 5,000 and others at

50,000.

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You can't have a sense of humor, if you have no sense.