- #41 [kitahara0011], 12-04-12 13:25i don't have a M7, or worked on 1 before, this discussion topic seems to be more constructive than some of the others, so i decided to read more here, and hopefully learn something. my questions may seem basic, and the answer may seems obvious to some of you, but asking questions seem to be a good way of learning.
- #42 [cprom], 12-04-16 06:49This JP20 powered by 2 separate PSU. The end result is you got a focus image and detail of every instrument. Actually I start with a kit and see if I like the sound then I redesign it from scratch. The PSU is on PCB and scaffolding the amp. The housing is made out scrap metal and recycle material. I don't like those housing selling in the market. No Character. They make every DIY amp the same look. Sick of it.
For your reference. - #43 [cprom], 12-04-16 06:50more photo
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- #44 [cprom], 12-04-16 06:51more photo
- #45 [cprom], 12-04-16 06:52more photo
- #46 [cprom], 12-04-16 06:55Last one
- #47 [kitahara0011], 12-04-23 14:18nice work, like the step attenuator, look like a ladder type ? what type of circuit topology ?
- #48 [ctscts888], 12-04-23 16:11C Hing們
小弟剛從二手區購入左部DIY JP200, 返尼試聽左一段時間, 覺得低頻唔多夠, 潛唔得低,
請問係咁情況下, 如何modify部機, 先可以增強低頻量同質呢?
感謝賜教
Thanks - #49 [tomeectom], 12-04-23 16:35DIY JP200, 返尼試聽左一段時間, 覺得低頻唔多夠, 潛唔得低,
請問係咁情況下, 如何modify部機, 先可以增強低頻量同質呢?
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師兄,
有無相?用甚麼膽? - #50 [cprom], 12-04-23 21:42有很多因素決定。例如組合,kit很多時用平價料但求有聲也顧不得質素了。先上傳相再硏究。This is very objective. A lot people comparing apple to orange. In other words, They want their hi fi system sounds like Kara ok or AV system. Harsh Hi pitch and rumbling low! Then we are talking in different language.
最後修改時間: 2012-04-23 21:44:21 - #51 [ctscts888], 12-04-24 12:23師兄,
有無相?用甚麼膽?
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本來跟機係用5751, 之後小弟換左德仔4x12ax7行頭&貓乸2x12ax7行後,
各方面都比5751好好多, 但之不過低頻依然唔多夠, 潛唔得低,
最後修改時間: 2012-04-24 12:23:19 - #52 [ctscts888], 12-04-24 12:26師兄,
有無相?用甚麼膽?
==========================================
本來跟機係用5751, 之後小弟換左德仔4x12ax7行頭&貓乸2x12ax7行後,
各方面都比5751好好多, 但之不過低頻依然唔多夠, 潛唔得低,
photo
最後修改時間: 2012-04-24 12:27:30 - #53 [baker.steven], 12-04-24 21:30低頻潛唔得低,如果肯定由前級引致,先要確定頻寬是否足夠,用訊號產生器.AC電壓表.示波器測試,必要時,做低頻補償,可能加兩粒電阻電容,比換零件來得有效,仿名機線路,從來都唔會有原機音效,只不過是沾些名氣,愚人愚己而以.
最後修改時間: 2012-04-24 21:34:15 - #54 [ctscts888], 12-04-24 21:50多謝師兄過料
剛和別C Hing 研究過,原來係output的2.0uf並0.01uf的cap(缐路係咁), 上手只用了一粒0.47uf cap代替的關係,現打算並粒2uf試試!睇下會否有改善! - #55 [支持基本自由人5], 12-04-24 22:41ctscts88,
我都覺得你可先試試先, 如原本數值唔夠, 肯定會無超低頻.
不用買貴料, solen 都可以試下先. 甚至再大D 數值也無妨~
最後修改時間: 2012-04-24 22:43:22 - #56 [ctscts888], 12-08-20 12:47before modification
- #57 [ctscts888], 12-08-20 12:54After nodification (小弟第一次自已動手mod機)
動態增加左, 低頻返晒尼之餘重源源不絕添,
最後修改時間: 2012-08-20 12:59:27 - 返回 ...