Re: 電流電圧変換回路

半年くらい前のエントリ：http://blogs.wankuma.com/nagase/archive/2007/08/31/92916.aspx#120872

ですが、

＞この回路図を基に0-10V入力に対して4-20mA出力になるような回路にするにはどうしたら宜しいでしょうか？

ということで、返信をテキストで記述しようとしたが、それを書くには余白が狭すぎるので新しく起こしました。

前段の加算回路で、2.5Vのオフセットをつけて、0Vから10Vを2.5Vから12.5Vに変換してます。

これを、1V=1.6mAの演算式で、R11をセットします。これで、（計算上は）出力に、4mA - 20mAを流せます。

ただし、上の回路はそもそもuAオーダーの出力を出すためものなので、オペアンプが飽和します。通常利用の場合は、電圧検出抵抗で検出した電流を電圧に変換して、増幅器の反対側に入れるのをオススメしておきます。

投稿日時 : 2008年2月4日 18:29

Feedback

# re: 電圧電流変換
ながせぶろぐ
Posted @ 2008/02/04 18:30
re: 電圧電流変換
# re: Re: 電流電圧変換回路
h_mkr
Posted @ 2008/02/06 17:04
ありがとうございます。

この回路を基に基板作ってみます。また結果mailします。
# re: Re: 電流電圧変換回路
nagase
Posted @ 2008/02/06 19:06
基盤作る前に検証してくださいね^-^;
精度むちゃくちゃ悪いですから。
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