- #86 [Joeyd], 20-08-02 11:00
- #85 [mcc2018], 20-08-01 21:34一般正廠TI既 op amp好少壞，除非儲存溫度或靜電量過高，不過627sm係鐵壳TO99型，TI既生產狀態係 NRND, 即是not recommended for new design, 正常生產過程，也聞說係個金屬外壳有機會有 tin whisker現象，不過發燒友視為珍品。
- #84 [Joeyd], 20-08-01 20:16請問未裝未用過的opamp易唔易壞? 有冇限期的?
我有兩粒627sm, 好似放置7,8年。
Thanks
最後修改時間: 2020-08-01 20:16:48 -
- #83 [mcc2018], 20-08-01 08:30
Do you think it's so simple to just direct replacement for the new generation op-amp without consideration of parasitic oscillation. Just a recap below for further reference and study.
- #82 [klou], 20-07-31 23:43Just finish soldering of 4 new OPA828, a new audio grade op amp supposed to be replacing OPA627.
Very good sound overall particularly the mid/vocal presentation; less ambience than ADA 4637. These two new ones are far better than my old toys like OP111, OP455, OP627, AD797, AD847, LME49710 etc
These new OP AMPs are cheap and cost effective. No need to buy from TB anymore. Dont know why they are all in SOC, not the more popular DIP 8 format. Anyway DIYers like me are more than happy to try out new toys ourselves.
For sharing with other Ching who are experts in this field.
- #81 [klou], 20-07-25 15:57Put 4 nos. of ADA4637 in my DIY Preamp, very good sound., slightly better than OP627, AD797. Cheap and worth to try. They are in SOIC and need some soldering to convert it to DIP8.
- #80 [254mm], 20-06-18 23:41National 又係任攞，但d ic 唔入流，唔靚声，唔要
- #79 [254mm], 20-06-18 23:39一間間廠政策唔同， AD 廠就煩d, 攞AD797, 只俾兩粒， BB 就濶佬，比八粒，取opa637bp 同 opa627bp 各八粒，三日就送到門口
- #78 [DYreal], 20-06-18 13:44呢啲濕濕碎啦。
早三十年前直接可以問下IC廠攞Video DAC chip。
平嘅IC分分鐘俾一筒你，貴嘅都起碼有三四粒。
最後修改時間: 2020-06-18 13:54:15 - #77 [254mm], 20-06-18 13:25忘記講，每次申請 samples, 可每欵多至八粒, 你計下幾錢
- #76 [254mm], 20-06-18 12:48講出黎，你地實恨餐跑，而家RS 賣的 正廠BB opa627BP, 每粒三百幾, 我那年代，廠samples 任攞，申請便飛机DHL 送來，兩三日便有，方便过去RS 買。往事只能回味了。
最後修改時間: 2020-06-18 12:49:35 - #75 [254mm], 20-06-18 12:42我都由5534 玩起，計来都幾十年，屋企IC 多到要掉，乜都有，有一樣，National semi conductor d Ic 工業用多，試过向廠取过d 佢話發燒IC, 6171, 6172, 声超薄兼起震，掉得，而家流行的 Lme49710，49720我也不敢睇好
- #74 [254mm], 20-06-18 12:33我仲反樸歸真，喜歡用Motorola mc33078, 声順耳自然，又唔貴，應冇假的，平野你出A 貨，賺好微，揾鬼做咩？
- #73 [banny2seng], 20-06-18 12:32回樓上。呵呵，我自己無玩OPAMP十幾廿年了，因為唔太喜歡OPAmp的深度大負回輸的聲音，我自己兩部自己設計的DAC分別用膽/牛做i/v同LPF，只是見到好得意的貼在此分享一下，最新的OPAmp流行乜我真係唔知。
- #72 [254mm], 20-06-18 12:28我亦有看来冒的铁壳IC, 竟然仲靓声过真的，神奇
- #71 [254mm], 20-06-18 12:25很奇怪， opa2604 可正負 24 V 电源，我架Dac analog 级有原子粒，有opa2604, 正是用 +/- 24V, 我用了陶瓷2604, 声好了仲冇咁热，好多文章話2604 冇出过陶瓷的，但我想極都唔明用乜IC 來做假2604 陶瓷呢？怕者用番2604 的芯片再啤陶瓷！其它IC, 至多挨到正負 22 V。奇在陶瓷2604 仲平过塑膠2604, 可能做假的大平賣放出黎。
最後修改時間: 2020-06-18 12:25:32 - #70 [banny2seng], 20-06-18 11:52
- #69 [tongtc], 20-06-10 12:01thanks!
- #68 [PhantomGTR], 20-06-10 11:47師兄，就咁睇圖，呢部 amp 恐怕係換唔到 opamp 喎。
- #67 [tongtc], 20-06-10 11:27你好!我想買平Nord One NC500DM Dual Mono那部,
用opa 1612 op amp,
https://www.nordacoustics.co.uk/product-page/nord-one-nc500dmst
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OP AMP
應該正廠的。在好大好出名果個網訂講，但忘記咗個名。
最後修改時間: 2020-08-02 11:00:50