簡易的PWMスイッチング電源で有名なNJM2374を試用した例。10kでVrefを2倍しているので、出力電圧は約2.5Vである。 実はブレッドボードを使い始めたはかなり最近で、それまではすべてハンダ付けして試作していた。 接触不良やインダクタンスの問題に悩まされることはなく、そのまま試作機に組み込めるという利点はあったものの、 修正を含めれば時間は結構それなりにかかるので、時を場合により、ブレッドボードを使う試作方法を選んだ方が良さそうである。
回路上は出力側が100µHと33µFで、負荷抵抗はつなげていない状態である。 リンギングというかLCによる共振がかなり大きく出ており、計測上769kHz(周期1.3µs)で、 入力側にはコンデンサを付けてないのと負荷にもよるし、ブレッドボードを使ったので、寄生インダクタンスもかなりありそうだが、 基板を起こしても出る場合は、スナバ回路は必要かもしれない。ブレッドボードはスイッチング電源の評価には不適切で、プロービングの問題もあると思われる。
I have to say I cringed a little when I read it, because it helps reinforce
the idea that there's a sort of Perl Hierarchy, or that there are Perl Gods,
or that "you must be this tall to ride".
Randal and I are just normal ol' Perl hackers. We just spend a lot of time on
Perl, and writing about it, and talking about it. The only reason we are Perl
luminaries is that we are Perl luminaries. I'm not necessarily a better
programmer, or have better ideas, or I'm a better debugger than anyone else. I
just do it and make noise about it.
Even though Joey's response was out of line, I admire his spirit of "I'm just
going to go do it." TMTOWTDI is one of the cardinal rules of Perl. Similarly,
over on the module-authors list, the perennial argument of "Maybe CPAN should
have minimum requirements for posting modules" has raised its ugly head.
Instead, I said what I always say during these arguments: "CPAN thrives
BECAUSE of the unfettered uploading of shit, not in spite of it."
So to it will be with Joey's website. Maybe it will be a dismal failure. Maybe
it will become the Next Great Perl resource. However, I know that there is
zero chance of Next Great Perl resource if he doesn't try. The only way you
get home runs is by stepping up to the plate, and if you strike out, you're
doing pretty good. Batting 3/10 is a great batting average, but in real life
we find those odds terrifying.
Personally, as much as I like the community around Perlmonks, I think it's a
terrible site for new people, and is practically unsearchable. I'd love to see
something leapfrog Perlmonks and become the Next Great Thing. That's why I
stopped writing to use.perl.org, because I think it's a terrible news source.
Instead, I started perlbuzz.com, and went with that. Yes, it's different, but
that's OK.
Let a thousand flowers bloom!
-- Andy Lester
-- "Let a thousand flowers bloom" ( http://mail.pm.org/pipermail/sanfrancisco-pm/2008-April/001640.html )
You will reach the highest possible point in your business or profession.