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PC用のアンプを作りました

https://blog.with2.net/link/?1965529

PC用のアンプを作りました

https://blog.with2.net/link/?1965529

小型スピーカでPCの音源を再生してみようとごく手軽なアンプを作ってみました。

デスクトップ用には以前に紹介したものを使っていますが家人のノートPC用に一台作ってみました。

・構想

  • ノートPC用なので出来るだけ小型に
  • 電源は12VACアダプタから
  • 音声入力は3.5㎜ミニジャックから、オプションでRCA入力

使用したアンプは前回と同じくNFJストアさんのTripath製TA2020というアンプ自作キットを使っています。キット部品のまま素直に組み立てても充分良い音なのですが、今回は出来うる限り音質に拘ってみました。

このキットの改造については愛好者が沢山いらっしゃるようで情報には事欠きません。

・5V独立給電化キットの取り付け

TA2020のIC内部にはDC5Vに変換するレギュレーター回路が組み込まれていてTA2020の30番ピンからDC5Vが出力されていて、NFJアンプキットではこの5VをTA2020の2番及び8番ピンに供給する形を取っています。この5Vを容量に余裕のある外部レギュレーターで作り出して供給する。

・空芯コイルへ変更

・電源平滑コンを2200μFへ変更

・主な抵抗をDALE製へ変更

・6Ωスピーカー最適化インピーダンス変更。

・入力カップリングコンデンサをメタライズドフィルムコンデンサへ変更

タイツウというところの謎のコンデンサに変更。

・TA2020にヒートシンク追加

音質にはほぼ関係なし。

ケースはaitendoのアルミケースを選択。

ボリュームは部品箱にあった2連独立調整できるものを使用。多分昔使っていたSONYのカセットデッキについていたもの。左右のバランス調整が別個に出来るので非常に便利。

電源スイッチはボリュームのデザインに合わせたものをアマゾンにて物色してLED付きのシーソー形を選択。元来は車用らしい。

以上のような内容でサクサクと組んでみました。

自己満足ながらクリアーないい音で再生してくれています。

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