発振器＋アンプ
さまざまな振動実験や交流実験、ストロボなどに使える発振器を作ります。
よく高校にある低周波発振器は図１のような大きなもので、これにアンプをつなげて使います。しかしこれは重くて取り回しが悪いし、結構いい値段がします。そこでなるべく安く、使いやすいものを作りたいと思います。
図１ 低周波発振器
低周波発信機の代わりにファンクションジェネレーター(図２)を使い、アンプは秋月電子の10Wモノラルパワーアンプキット(図３)を使います。
図２ ファンクションジェネレーター
+
図３ アンプ
材料
ファンクションジェネレーター(秋月電子miniDDS) パワーアンプ(秋月電子 10Wモノラルパワーアンプキット) プラスチックケース(タカチ) ピンジャック×３ DCジャック トグルスイッチ スイッチランプ ピン端子ケーブル BNC-RCA変換器 AC-DCアダプター(15V 1.2A)×２
製作方法
プラスチックケースに穴を開け、各端子を固定し、端子、アンプ、導線をはんだ付けします(図４)。アンプはケース内部に固定し、ファンクションジェネレーターはケース外側に固定します(図５)。
だいぶいい加減な配線ですので、もっと無駄なくできると思います。また本当はヒューズを入れたほうがいいですね。
A…ピンジャック(外部出力) B…ピンジャック(ジェネレーター→アンプ) C，D…DCジャック(アダプタ入力) E…ピンジャック(外部出力) F…スイッチランプ G…アンプ用スイッチ
図４ ケース内部
図５ ケース外部
使い方
①周波数(0Hz～200kHz) ②波形(sin波、三角波など) ③電圧振幅(0V～5V) ④オフセット電圧
アンプを使っているので実際には画面の１０倍程度の電圧になります。
図６ ファンクションジェネレーター画面
○この装置を使う実験
・振動関係 弦の定常波、ばねの定常波、クントの実験、水波投影機、音波に関する各種実験、ボーアの水素原子モデル
・交流関係 交流による光源の点滅、リアクタンス、LC共振回路
・ストロボ関係 止まって見える水滴、水波投影機
公開日：
最終更新日：2016/05/16
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