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秋月で買えるPSG音源チップYMZ294で遊んでみた ボード完成編

                                  JAGA #66 菅原慶真 

•ブレットボード上で試作してみたが・・・・・









・音が小さい →アンプ側の電流不足っぽい

        この回路とスピーカーは

        USBのバスパワーで駆動できない

・オペアンプを使って

 アンプ回路をボード上に作ると・・・・

 

 →回路が複雑になって試作するのが大変

 (実装もデバッグも

 

 →今後、作成したシールドを頒布したいので、

  部品点数を少なくして簡単に作れるようにしたい



・ということで、方針変更

 →アンプ回路は既製品のモジュールを使う

 (NJM386アンプ→秋月PAM8012アンプモジュール)

 →スピーカーも出力の小さいものに変更

  (8W→1W)

 →可能な限り、一か所で部品を揃えられるようにする

 

→
こう
これが

種類
 品名
 個数

電解コン
 muse 220μF
 3


 muse 10μF
 1


 muse 1μF
 1

フィルムコン
 0.1μF
 2


 1000pF
 1

可変抵抗
 10kΩ
 1

抵抗
 各種
 5

ミニジャック
 DIP化基板
 1

PSG音源
 YMZ294
 1
水晶発振器
 角砂糖型4MHz
 1

オペアンプ
 NJM386BD
 1

試作基板
 P-09624
 1
種類
 品名
 個数

電解コン
 muse 47μF
 1


 muse 10μF
 1

フィルムコン
 0.1μF
 1


 1000pF
 1

可変抵抗
 10kΩ
 1

抵抗
 10kΩ
 1

コネクタ
 XH
 1セット

PSG音源
 YMZ294
 1
水晶発振器
 4MHz
 1

アンプ基板
 PAM8012
 1

試作基板
 P-07555
 1
→
部品点数を削減(19→11)
基板試作サービスにお願いして



プリント基板を作りたい!!!

参考資料 KiCad実習テキスト「KiCad Basics」

https://make.kosakalab.com/make/digital-publishing/kicad_textboo
k/

資料が充実しているのでkicadで回路をひくことにした

・大雑把な流れ

部品を配置して回路図を描く(Eeschema)

↓

足りない部品のテンプレートを作る

↓

実際にプリント基板のレイアウトを作る(PcbNew)

↓

加工用のデータ(ガーバー)にして出力する

部品を配置して回路図を描く(Eeschema)

足りない部品のテンプレートを作る

→コンデンサ等の一般的な部品であれば、テンプレート
があるが、基本的に自分で書く必要がある。

実際にプリント基板のレイアウトを作る(PcbNew)

加工用のデータ(ガーバー)にして出力する

出力したら表裏の配線に誤りがないことを確認する。

→ここを怠ると修正が効かなくなる

試作屋さん

料金(100x100㎜、

1.6㎜10枚)

日本語サポート
 配送業者
 備考


 4.9ドル

(紫とマットブラックを除
く)

あり

DHL,

Fedex,

ems等々

シルクが
微妙


 10.6ドル

(紫とマットブラックを除
く)

あり

専任の担当者
(!)が付く

UPS、DHL

ただし…

遠隔地集
配手数料
が高い


 4.9ドル

(緑、赤、黄、青、白、黒
のみ)

あり

DHL,

Fedex

よさそう

・試作屋さん色々あるけれど・・・・

・elecrowは・・・・

 価格は安いけど、

 シルクずれや基板の数が違う等の情報アリ



・pcbgogoは・・・・

 日本語が喋れる専任の担当者が付いたり、

 サポートはよかったが、送料が高すぎる

 (基板代+送料+遠隔地集配手数料→¥5000超)


→今回はfusionPCBにお願いした

yeah!!!!!!

発注から到着まで

約10日@from
shenzhen(DHL)



製造は翌日に完了(!)し
ているのに発送まで時間
が掛かる・・・。

Githubで取扱説明書を
公開予定

パーツリスト共有サイト「akicart」で

秋月から簡単に部品を購入できるようにした

シルクのずれ、

レジストの剥がれは見
られなかった

@のように細かい文字は潰れてしまうみ
たい・・・。

当初は同梱されていた角砂糖型の

オシレータが付属しなくなったので、別
売のもので代用。

Arduino側のピン配置の都合で

捺印が反対になってしまった・・・。

次verでは何とかしたい。

音量をそれほど調整する
必要がなかったため、半
固定抵抗に変更。

•知識ほぼゼロからスタートして約1年間で基板を設計するとこ
までできた

•ハードウェアを作るの、すごくたのしい

•これから何する?

 midiシールドを作ってmidi経由で制御したい

 mmlを覚えて打ち込みしたい

 マトリックスLEDディスプレイを作成して

 同期してbadappleを演奏したい

Ymz294 secondpart

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Ymz294 secondpart