アンプなどについている、Treble/Bassのことです。前から使っているTRIO TW-31の周波数特性がなにかおかしいので、 プリアンプ段についているCR型トーンコントロール回路を見直したところ、回路が逆に実装されているようでしたので、 10k、50k、100kの可変抵抗を用いた回路を再実装しました。
減衰が大きいので、両側にバッファアンプが必要となります。ボリュームはAカーブで、中央で15％程度を基準として作ってあります。 基本的には、C/Rの上下比がボリュームの抵抗比と同じになるようにすればよいはずですが、系列の中の数値を選ぶ必要があるので、 少々難しいかもしれません。
LTSpiceのファイルもありますので、簡単にシミュレーションできます。
TRIO TW-31に再実装した回路です。一部回路面の変更が必要となりました。
One thing hackers like is brevity. Hackers are lazy, in the same way that
mathematicians and modernist architects are lazy: they hate anything
extraneous. It would not be far from the truth to say that a hacker about to
write a program decides what language to use, at least subconsciously, based
on the total number of characters he'll have to type. If this isn't precisely
how hackers think, a language designer would do well to act as if it were.
It is a mistake to try to baby the user with long-winded expressions that are
meant to resemble English. Cobol is notorious for this flaw. A hacker would
consider being asked to write
add x to y giving z
instead of
z = x+y
as something between an insult to his intelligence and a sin against God.
-- Paul Graham
-- Being Popular ( http://www.paulgraham.com/popular.html )
Writing code in a compiled language is one of the last things that still can't
be done instantly on a garden variety home computer. If your compilation
process takes more than a few seconds, getting the latest and greatest
computer is going to save you time. If compiling takes even 15 seconds,
programmers will get bored while the compiler runs and switch over to reading
The Onion, which will suck them in and kill hours of productivity.
Debugging GUI code with a single monitor system is painful if not impossible.
If you're writing GUI code, two monitors will make things much easier.
Most programmers eventually have to manipulate bitmaps for icons or toolbars,
and most programmers don't have a good bitmap editor available. Trying to use
Microsoft Paint to manipulate bitmaps is a joke, but that's what most
programmers have to do.
At my last job, the system administrator kept sending me automated spam
complaining that I was using more than ... get this ... 220 megabytes of hard
drive space on the server. I pointed out that given the price of hard drives
these days, the cost of this space was significantly less than the cost of the
toilet paper I used. Spending even 10 minutes cleaning up my directory would
be a fabulous waste of productivity.
-- Joel Spolsky
-- "The Joel Test: 12 Steps to Better Code" ( http://www.joelonsoftware.com/articles/fog0000000043.html )