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TV用アンプを作ろう

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

TV用アンプを作ろう

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

自室のTV音声が貧弱なのが以前より気になっていました。
しばらくArduinoとロボットはお休みしてTV用のスピーカアンプを作ることにしました。
構成は、
アンプはNFJ社さんのST製DTDA7492を搭載した50W+50WのデジタルアンプをYahooショッピングで購入、入力は光端子と念のためにRCA端子を装備することにします。

  d0335326_15390492.jpg
光入力はいちから基板をおこすのも面倒なのでアマゾンで中国製の完成品を購入し、ケースから取り出して中身を使うことにしました。
 d0335326_15390043.jpg
今回は使い慣れた部品構成でさっさと組み上げることに主眼をおいています。
電源は普通にACアダプタで済ませれば簡単なんですが、それでは面白くないのでトロイダルコアトランス(HDB-25(L) 0-12v 1A)を奮発して直流安定化電源を自作します。(自己満足の世界)
AC電源回路なので部品の選定と配線のほうは電子工作超初心者としては慎重にやらないと大変な事になるので、共立電子のこちらの情報を参考にさせてもらう。
http://www.technobase.jp/eclib/SIKIT/MANUAL/skden1.pdf
ケースはタカチのYM-300を選択してその他の部品と一緒に共立エレショップで購入します。

 d0335326_15384982.jpg

アンプの上のほうにあるのはカップリングコンデンサーです。キットのコンデンサーは取り外してCROSSCAP社のコンデンサーCROSS-CAP 2.2μFに換装してあります。(これも自己満足、しかし確実に音質に差があります)
TVの下に置くのでケースは見栄えのよいものにということで、タカチのYM-300に別途アルミ板で化粧版を作成して前面に取り付けました。
 組み上げてTVに光ケーブル経由で繋いでみました、スピーカーは押入れに眠っていたSONY製のコンポ用のものを引っ張り出してきてつないでいます。
 d0335326_15384261.jpg
当然ながら、TVスピーカーよりは迫力のある音が鳴り響いています。狭い自室では出力十分です。

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