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   不器用なのにモノ作り大好きな中島です!

皆様にご静観(?)いただいております“DHD”ですが

  (DHD:ダイレクト・ホーン・ドライブの略ですが

                造語ですのでネットで検索しても出て来ませんよ~)

001・002ではスマートフォン内臓スピーカーの音を

 ホーン構造で何とかしようと奮闘して参りましたが

  音質についてはもはや限界が見えてしまいました・・・

残る手立てはイヤホンジャックからダイレクトに

      信号を取り出すしかございません!

イヤホンジャックの出力データを見ますと

  周波数特性は20~20000Hz CD並みだぁ~

  定格出力は0.2W以下 小型ラジオの4分の1・・・

  インピーダンスは32Ω 厄介です

     まぁイヤホン用ですからねぇ

       ある日のこと

100円ショップでカワイらしいスピーカーを発見!

       諸元を見ますと

諸元

再生周波数は20~20000Hz! マジかっ!

  数万円するスピーカーユニットでも出ない音域!

                 (でも・・・はっきり言って「マユツバ」です)

音圧レベルは80+-10dB・・・な・なんとアバウトな数値

  90dBなら合格ですが80dBならイマイチ

    しかし70dBなら論外と言えます

定格入力の0.25Wは問題なし!

ちなみにインピーダンスは

    理論上は4個を直列に繋げば32Ωになります

  そこで~「003」製作に向けスピーカーを8個大人買い

ピンコードの中継ぎプラグとオーディオ接続コードも購入

  そして今回も箱(エンクロージャー)は「紙」で作ります!

   「幸せボンビー○○○」でお馴染みの「MDF材」×3枚

       今回は総額1,404円のお買物をいたしました!

お買物

いつもの様にザックリな設計図から図面を起こして加工へ

設計図

 紙とは言っても今回のMDF材は合板並みの強度と質量!

流石にカッターナイフで何とかなる代物ではございません

使用工具

   まずは前面(バッフル面)の加工から~

組立工程の関係で塗装も同時進行いたします

とりあえずスピーカーを取り付けて直列配線し抵抗計測

抵抗値測定

29Ω・・・まぁ問題ないレベルでしょう

なぜインピーダンスにこだわるかと言えば

  ◇スマホ内部の回路保護のため

  ◇マッチングさせ出力効率を上げるため

試しに鳴らしてみましたが…音量が小さい・・・

  たぶん低効率スピーカー4個の接続で

    マッチングによる効率UP分は相殺されたのかと・・・

       再生時はフルボリューム確定です

次に中継ぎプラグをリューターで真っ二つ

中継プラグ加工

力がかかる部分なので

  ハンダ付けしてからエボキシ系接着剤で固定

  (エボキシ系接着剤は乾燥すると金属並みの強度が出ます)

前回同様片側側面を先に組立てて

   最後にもう一方を接着します

バックロードホーン

      構造は生意気にも「バックロードホーン」です

   これは管楽器が大音量を出せる理屈と同じなのですが

 スピーカーユニットの背面から発する音を拾いあげ

長いホーンを 通すことにより低音域を増幅させる構造で

    今回の「003」のホーンの長さはおよそ70㎝です

完成

さっそくオーディオ接続コードを繋いで試聴

    ん・・・確かに内蔵スピーカーでは「パツンパツン」と

  雑音にしか聞こえなかったバスドラムの音が

   改善しておりますし

    殆ど聞こえなかったベースの音も微かに聞こえますが

   やはりフルボリュームでやっと普通の音量・・・

                32Ωが最後まで足かせとなってしまいました・・・

また 所詮1個100円のスピーカーですから

                        ワイドレンジなど望むべくもございません

それでも店頭ではⅰ-Padで~こんなことも!

放映中

 外観は4連スピーカーのおかげでなかなかの迫力!

でも・・・近くで見ると私の不器用さが随所に見受けられる

      残念な仕上りとなっております・・・

今週末まで店頭に001~003を展示いたしますので

     興味が湧いた方は

          苦労が報われない私を慰めにご来店下さい・・・