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Path JDirectItems Auction > Home Appliances, Audio & Video, Camera > Audio Equipment > Amplifiers > Headphones Amplifier
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Seller 5bLhM***
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Seller 5bLhM***
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JDirectItems Auction Home Appliances, Audio & Video, Camera Audio Equipment Amplifiers Headphones Amplifier
♪♪FET差動ヘッドフォンアンプ 電子ボリューム付 送料無料♪♪
        

  • Quantity
    : 1
  • Starting Bid
    :1円
  • Highest Bidder
    : cha******** / Rating:59
  • Start Time
    :Aug 03, 2026 01:13
  • End Time
    :Aug 09, 2026 21:36
  • Auction ID
    :d1239395537
  • Item Condition
    :Damaged and stained (specify in description)
  • Auto Extension
    :Yes
  • Authentication
    :Yes(Description)
  • Early Close
    :Yes
  • Return Accepted
    :no
  • Description
  • Q&A ()
  • Estimated Cost
  • Report an Issue
Notes
  1. Plug-in electrical appliances are only shipped by air (shipping by sea requires commodity inspection)
♪♪FET差動ヘッドフォンアンプ 電子ボリューム付 送料無料♪♪
商品説明自作のヘッドフォンアンプです。ぺるけさんのFET差動ヘッドフォンアンプV4を参考にしたものです。
ボリュームに電子ボリュームを使用しています。LM1972MをPICマイコンで制御しロータリーエンコーダで音量調整します。操作していないときはPICをスリープモードにしてノイズ低減に努めています。電子ボリュームはバッファ無しのATT直出しでアンプに入力しています。
電子ボリュームの使用は音質上からの理由ではなくて利便性のために採用しました。いつもの音量が数字で設定できるので至極便利です。
音量調整だけですが赤外線リモコンも使用できます。使用方法は前面の黒いボタンを長押しすると学習モードになるのでヘッドフォンジャック横の受光部に向けてリモコンボタンを押して学習させて下さい。エアコン用以外の大抵のリモコンが使えます。(保証の限りではありません)秋月や100均のリモコンが安くて良いかと思います。
ヘッドフォンアンプにはプリアンプとしても使用できるようにRCA端子を付けています。
残留雑音は左右チャンネルとも8μV程度です。(10Hz~500kHz)
バスブーストスイッチを設けています。3dB程度なので極わずかです。
電源はトロイダルトランスで別筐体となっています。3端子レギュレータと無帰還レギュレータの2段レギュレータで±7.5Vに安定化しています。
NFBのDCカットコンデンサを省いています。コンデンサの癖が無くなりよりクリアな音になったと感じています。
電源投入後熱的に安定すれば出力のDCは±1mVを超えることはありません。
当方もプリアンプとしてもヘッドフォンアンプとしても使用しておりますがとても静かで長時間聴いても疲れない良い音で鳴っていると思います。(主観です)
注意事項ですがパワーアンプの電源を入れたまま出力をオフしないで下さい。ポップノイズが出ます。
ケースは流用品のため本体に余計な穴が数か所空いています。ご了承下さい。
注意事項音が出ないなどの故障があった場合商品到着後3日以内にご連絡いただければ対応いたします。それ以外は返品不可とさせていただきます。
支払方法Yahoo!かんたん決済
こちらの商品案内は 「■@即売くん5.85■」 で作成されました。

The
この他にも出品しておりますので宜しければご覧ください。


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Item Amount

JPY

Sales Tax(10%)

None

Estimated Local Shipping

JPY

Estimated Weight

kg

Estimated Size

Length(L)
cm
Width(W)
cm
Height(H)
cm

Payment Method

Calculation Result

Proxy bidding and purchasing services are becoming increasingly convenient. However, overseas shopping carries certain risks and issues. To reduce these risks and enhance shopping safety, please be sure to read the following information:

1. International Shipping

   Air Freight: If the item status is not confirmed within two days after the arrival notice, any customer complaints cannot be addressed with the seller.

2. After Receiving the Product

Please confirm and inspect the product as soon as possible to ensure that the product specifications, quantity, accessories, and description are correct

If, unfortunately, there are any issues, you can refer to the following examples on how to report related product problems:
1. Example of missing product information
2. Example of product not matching provided information
3. Example of damaged product information

Important Notes: 1. If the seller is unwilling to ship overseas or is unaware that the product will be shipped overseas, the international shipping cost for returns or exchanges will need to be borne by the member. You may refer to the EMS e-Express fee inquiry from the post office. If it involves alcoholic beverages or items that affect flight safety, the post office cannot be used for shipment, and only DHL can be used to ship back to Japan.
2. During the product complaint handling period, please retain the complete outer packaging of the product (including the shipping label information), and refrain from attempting any repairs or altering the original condition. Any modifications may result in the inability to process the case.

3. After Inspecting the Product

After receiving and inspecting the item, if you have any questions, it is recommended to contact Letao within 2 hours. Here are some reminders:

1. Please do not unpack, use or repair the received item yourself, and be sure to keep the original packaging to facilitate subsequent handling of related matters, so as to avoid changes to the item that may cause the seller to be unwilling to process.

2. You can call customer service, and the customer service will leave a message for you as below. Please provide the following information:
"Hello, we will first help you establish a complaint case for Product ID: _______ .But we need you to 2-3 clear photos of the product issue, including photos of the product problem, product packaging, shipping details slip, and outer box. Send them to service@letao-holdings.com and inform us of your desired resolution (failing to provide this may result in an inability to process subsequent matters). After sending the email, notify us in the customer service message. We will confirm with the seller as soon as possible. and if there are any related questions, we will contact you through the customer service message. Thank you for your cooperation."

Please provide:
1. "Product ID"
2. Photo of the "Delivery Note" (if any)
3. Photos of the outer box (including inner and outer packaging)
4. Photos of the product (Please include relevant descriptions to help us confirm with the seller)

Important Notes:
1. Do not include foreign text or other products in the background of the image.
2. Please keep the complete product packaging (including the shipping label information), and refrain from repairing or altering the original condition on your own, as any changes may result in the case being unable to be processed.
3. Please provide the relevant information within 48 hours to avoid missing the golden hour for reflection and causing situations that cannot be handled.
4. Due to 99% of Japanese sellers being unwilling or unaware of shipping goods overseas, if a seller is willing to handle the issue, the goods must be sent back to Japan, and the international shipping costs incurred must be borne by the member. Letao will use postal EMS international express to send the goods back to Japan.
5. As the goods are purchased from overseas, it may take approximately one to two weeks to complete the relevant processing procedures when issues arise with the goods. Please be reminded that you can inquire about the approximate cost through the EMS service at the post office.

4. FAQ

1. Issue of Authenticity: If antique or branded goods are found to be counterfeit upon receipt, clear photos showing the differences between the genuine product and the imitation must be provided as evidence. If unable to provide relevant proof, assistance can be sought to find a third-party reputable organization for a premium authentication service .
2. Leaking Iron Teapot: If an antique iron teapot is leaking, please take clear photos of the leaking area and provide them.
3. Transport Damage: If the goods are damaged during international shipping (to the pickup point), you need to provide photos of the outer packaging of the parcel and clear photos of the damaged goods' outer packaging.

※ Note: Photos provided to sellers should not contain any foreign-related information.
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    Product name: ♪♪FET差動ヘッドフォンアンプ 電子ボリューム付 送料無料♪♪
    Notes:
    Customer service hours:
    • Monday to Friday 10:00-18:00
    Customer service hotline:
    Customer Service Email: service@letao-holdings.com
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