| 談天說地主旨 ﹝請按主旨作出回應﹞ | 寄件者 | 傳送日期
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| [#1] 220V-＞100V降壓牛 求中村制作所東京銷售商店 去東京旅遊，順手買隻牛俾d100V玩具用 拜託大家 最後修改時間: 2025-09-09 10:01:49 |
navigim 會員14.xxx.xxx.94 |
2025-09-09 09:59 | |
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| [#2] 220V—100V降壓牛 視乎kVA, 香港買隻240V轉110V都可以用,有隻HP電腦用隔離牛,當年熱賣,超重,太嘈,無用十幾年,什麼抽頭都有 國產有瞬红（一定燒）,有100及110V ,有膠外殼用於投射機,是自耦式,auto transformer ,買大無壞 |
alexanderkoo 正式會員 223.xxx.xxx.173 |
2025-09-09 10:07 |
| [#3] 220V—100V降壓牛 500VA不多於1000VA 不少於2個100V outputs 重質為主 最後修改時間: 2025-09-09 10:46:23 |
navigim 會員 42.xxx.xxx.156 |
2025-09-09 10:42 |
| [#4] 220V—100V降壓牛 大陸牛應該無問題,又唔係高科技,要買有牌子（不是3毛）及多人買 數碼用,最好隔離牛 最後修改時間: 2025-09-09 10:59:31 |
alexanderkoo 正式會員 14.xxx.xxx.204 |
2025-09-09 10:58 |
| [#5] 220V—100V降壓牛 有用過「日章?」Nissyo, 未用過中村. 可不可以在 Yahoo co jp 「shopping」或 Amazon co jp 買 之後寄去酒店附近便利店取 ? 通常兩日就收到貨. |
10001club 會員 70.xxx.xxx.36 |
2025-09-09 13:42 |
| [#6] 220V—100V降壓牛 USD 89% efficiency 7 kg only  最後修改時間: 2025-09-09 21:35:09 |
Kenny 正式會員 218.xxx.xxx.199 |
2025-09-09 21:34 |
| [#7] 220V—100V降壓牛 有甚麼數據顯示質素？除了絕缘,基本是class E,環型隔離牛應是最好,leakage reactance 低,odd harmonics 唔過,仲用緊,唔會用C-core 呱,方牛又會好力的,繞法之類主要是output 牛 |
alexanderkoo 正式會員 223.xxx.xxx.20 |
2025-09-10 09:07 |
| [#8] 220V—100V降壓牛 中村降壓牛，資料不多，找不到官網 |
navigim 會員 14.xxx.xxx.130 |
2025-09-10 09:43 |
| [#9] 220V—100V降壓牛 輸入電壓是自適應？  |
navigim 會員 14.xxx.xxx.130 |
2025-09-10 09:51 |
| [#10] 220V—100V降壓牛 為什麼高階音響都採用環形火牛, 而不是矩形或圓柱形火牛？ |
Mercury2015 正式會員 112.xxx.xxx.50 |
2025-09-10 10:41 |
| [#11] 220V—100V降壓牛 Ring (Toroidal) Transformer • Shape and Construction: A toroidal transformer has a circular, doughnut-shaped core, typically made of silicon steel or ferrite, wound with copper wire. The core is continuous, with no air gaps, which enhances efficiency. • Efficiency: Higher efficiency (86–90% for a 50W toroidal transformer) due to the lack of air gaps and uniform winding, leading to lower energy losses. • Temperature Rise: Generates less heat due to efficient magnetic flux distribution, making it suitable for high-power applications or environments with temperature constraints (e.g., can operate at -30°C, ideal for outdoor use). • Leakage and Noise: Minimal leakage current and low electromagnetic interference (EMI) due to symmetrical construction and lower stray magnetic fields, making it ideal for sensitive applications like audio systems. • Size and Weight: Compact and lighter for the same power rating (e.g., O-core toroidal transformers are 15% smaller and lighter than traditional toroidal designs). • Cost: More expensive for smaller units, but cost-effective for high-power applications (above 200W). • Durability: Longer lifespan due to robust construction and minimal core degradation. • Applications: Widely used in audio equipment, medical devices, telecommunications, and home appliances like quartz lighting. Also used in smart home devices like the Ring Smart Lighting Transformer for low-voltage landscape lighting (12–15V, 200W). E-I or Rectangular Transformer • Shape and Construction: Features an E-I or rectangular core made of stacked silicon steel sheets, forming a rectangular or square shape with air gaps between the E and I sections. • Efficiency: Lower efficiency (80–84% for a 50W transformer) due to air gaps in the core, which cause magnetic flux leakage and higher no-load losses. • Temperature Rise: Higher temperature rise compared to toroidal transformers, which can limit use in high-power or heat-sensitive applications. • Leakage and Noise: Higher leakage current and low-frequency interference, making it less suitable for applications requiring low EMI, such as audio systems. • Size and Weight: Bulkier and heavier for the same power rating due to the rectangular core and less efficient use of materials. • Cost: Generally cheaper for smaller units or in applications where cost is a priority, such as domestic power supplies. • Durability: Shorter lifespan compared to toroidal transformers due to higher wear from thermal and magnetic inefficiencies, and potential distortion under short-circuit conditions. • Applications: Common in cost-sensitive applications, such as older doorbell systems or basic power supplies. For Ring doorbells, square transformers (e.g., 16V 30VA) are often used as hardwired solutions for models like the Ring Video Doorbell Pro, requiring 16–24V AC and 30–40VA. |
Kira.L 正式會員 116.xxx.xxx.243 |
2025-09-10 10:59 |
| [#12] 220V—100V降壓牛 ＞＞ #10 ＞＞ 為什麼高階音響都採用環形火牛, 而不是矩形或圓柱形火牛？ Answer from AI. |
Kira.L 正式會員 116.xxx.xxx.243 |
2025-09-10 11:00 |
| [#13] 220V—100V降壓牛 .. 電壓是自適應 係膠科技嘢來呀 買曬專利㗎喇 ........  最後修改時間: 2025-09-10 13:50:23 |
daddykool 會員 118.xxx.xxx.17 |
2025-09-10 13:49 |
| [#14] 220V—100V降壓牛 請恕我孤陋寡聞未聽過自動適應雙向電壓器, 請問有冇師兄可以解釋一下是什麼東西? 自耦雙向變壓器, 簡稱自耦變壓器就聽過, 不過呢樣嘢好似已經發明咗超過100年. |
Mercury2015 正式會員 112.xxx.xxx.50 |
2025-09-10 14:44 |
| [#15] 220V—100V降壓牛 曾經買過日本座檯耳擴機(100V)，拆開殼set jumper, 去到台灣開會幾天，110V使用，回港set jumper至220V正常使用 降壓變壓器就唔知了 |
navigim 會員 42.xxx.xxx.156 |
2025-09-10 15:04 |
| [#16] 220V—100V降壓牛 雙向嘅意思係： input 入乜電壓乜頻率都得 output 可以選擇出乜嘢電壓頻率 電子牛乜嘢都可以再生。 |
Kenny 正式會員 14.xxx.xxx.107 |
2025-09-10 18:07 |
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