標題: UCD-D類後級工作坊實况 (Day1+2) [打印本頁] 作者: 匿名 時間: 2006-5-14 14:20
提示: 作者被禁止或刪除 內容自動屏蔽作者: lleung 時間: 2006-5-15 16:42
want to upgrade the UCD 400 onboard cap to Blackgate, 470u/100v, how is the pricing?作者: Kelvin1728 時間: 2006-5-15 19:27
Hi Admin, if I find myself interested in the UCD400 module after I finish the introductory PCB course, could I order the parts via you later at the same price?作者: admin 時間: 2006-5-15 21:55
Kelvin1728, sure, pls contact me when we see on this Thur to confirm the details作者: dynamicdog 時間: 2006-5-16 02:24
見到大家玩得咁開心, 我都想黎作者: lleung 時間: 2006-5-16 11:35
I found Blackgate price: 470u/100v, STD series, @HKD 270. HK Bush作者: lleung 時間: 2006-5-17 14:56 標題: UCD-D類後級工作坊實况 I got this case from HK bush, HKD 700, and they have a smaller one, HKD 600.作者: gogogojump 時間: 2006-5-18 00:05
I saw the power amp of Nuforce(Class D)at BO Acoustic is very small, why UCD 180(also Class D) need big transformer and big condenser?作者: admin 時間: 2006-5-19 02:11
gogogjump, it is the difference of switching power supply and linear power supply. UCD can also use switching power supply as well.作者: lleung 時間: 2006-5-19 11:36
Is there any differ for the sound quality? Compare with linear and switching power supply.作者: admin 時間: 2006-5-19 14:16
Good switching mode power supply is hard to make as there will be lots of EMI affect the amplifier section.
It is just similar to your PC sound output, no matter how good is your sound card, there will be some interference from the PC's power supply and circuit.
However, technology is advancing and we can see some better products in the market which has the quality comparable with linear power supply.作者: 匿名 時間: 2006-5-24 21:21
提示: 作者被禁止或刪除 內容自動屏蔽作者: TWM 時間: 2006-5-26 21:18
Due to time shortage, the theory session was skipped. Is it possible to forward the powerpoint slides of the theory session that KK has prepared to us? I do like to know more on this.作者: admin 時間: 2006-5-26 21:35
TWM,
this is the circuitry of UcD 180 from Jan Peter of Hypex. I thought the capacitor you are talking is C7 &C8.
Happy listening
http://www.diyaudio.com/forums/showthread.php?s=ccff42f8bead2471198dd575335315bf&threadid=38199[/img][/url]作者: lleung 時間: 2006-5-27 22:38
Sunsvc,
But I am using UcD400. It is 470U/100V, big differ from UcD180. Can you tell me where to download the circuit?
Thanks a lot.作者: sunsvc 時間: 2006-5-28 14:31
Leo
You may follow the link above and ask Jan-Peter, he looks very helpful.
By the way, the thread also contains a lot of discussion on the upgrade.
Good Luck!作者: godwin01 時間: 2006-5-28 14:36 標題: Request PowerPoint Pls also email me the powerpoint.作者: ttthomas 時間: 2006-5-28 16:45
Please send the powerpoint to me also.
Thomas作者: william 時間: 2006-5-29 01:15
Hi Leo,
I am helping you to get the recommendation from Hypex regarding the cap upgrade inside the module作者: william 時間: 2006-5-29 01:18
Hi Godwin & Thomas,
information has been emailed to you作者: lleung 時間: 2006-5-29 10:47
thanks william and sunsvc!
william: would you please also send me the powerpoint?作者: william 時間: 2006-5-29 14:27
Leo, you are welcome, information has been sent to you.作者: lleung 時間: 2006-5-29 17:31
William, i have not received it; maybe something wrong with my server. can you send it again to lleung@grove.com.hk or the hififever account? thanks.作者: william 時間: 2006-5-29 17:59
Hi Leo,
Sent to you again using hififever account. pls check作者: lleung 時間: 2006-5-29 20:14
William, I got it. Thanks作者: lleung 時間: 2006-5-29 20:21
William, sorry to trouble you again... do you have the "2nd week" powerpoint?作者: TWM 時間: 2006-5-29 21:39
Yes, "2nd week" powerpoint X2. What you send to us is the procedure of assembly. What we want is the circuit theory of the UcD or Class D amp. If I am not mistaking, KK has prepared it and showed 1-2 slides of it to us in the class.
BY the way, any news on replacing the input buffer to AD Op Amp?作者: sunsvc 時間: 2006-5-29 21:59
Leo, this is the must do mod.
By the way, the following is quote from a guy name matjans
Quote: on the ucd180 (rev 1.00) the input caps are c7 and c8, on the ucd400 thay are indeed c23 and c24
When replacing the input caps, you can use high quality non-polar (bipolar) electrolytics like black gate N, NX or, better still, use high quality film caps. These tend to be much larger than electrolytics but they sound better. If you want to use these, remove the old input caps, bridge them with a small piece of wire and put the input caps between the rca/xlr sockets and the modules. As these are non-polar, direction (??) is not important unquote作者: william 時間: 2006-5-29 22:40
Leo & TWM, I'll send you the session of the slides asap
Leo, for the cap replacement, the engineer from Hypex also recommend 220uf/100V "136" type from BC components. Blackgate is also fine but he feel a little bit too soft. You may have a try and compare.作者: lleung 時間: 2006-5-29 23:08
guys, I will try my blackgate 470u. if i feel it is too soft then i will try some other, maybe jensen. will update all of you. for the +/-12V stuff or op amp, i will wait...作者: william 時間: 2006-6-1 13:54
Leo, look forward to your upgrade result作者: admin 時間: 2006-6-3 10:59
Hi everybody, KK is finalizing the slides, you may also review the following information first
D類設計提升音訊放大器的效率
http://www.ti.com.tw/articles/detail.asp?sno=49&catalog=10作者: lleung 時間: 2006-6-7 11:45
the improvement is not that high; i will roll it back and use the 470u (Blackgate) to try the aux +-12V power.作者: lleung 時間: 2006-6-7 17:38 標題: UCD-D類後級工作坊實况 (Day1+2) See the UcD 400 with Blackgate, the improvement is not that good so i roll it back, attached pix FYI only.
William, can you post more detail regarding the aux power? (model number of the IC, circuit...)作者: lleung 時間: 2006-6-7 17:40 標題: UCD-D類後級工作坊實况 (Day1+2) forgot to attach the pix...作者: william 時間: 2006-6-8 11:50
Leo,
http://www.hypex.nl/docs/UcD400AUX.pdf
Tell you how to use dedicated +/- 12V power for the input buffer作者: lleung 時間: 2006-6-25 09:13 標題: UCD-D類後級工作坊實况 (Day1+2) My 2nd UCD400, with speaker protection. Use Jensen 10, 000uf x 4 per channel.
Sound is good! More musical.作者: william 時間: 2006-6-25 13:03
勁!! 我們有一份現成的12v穩壓, 可以用在opamp, 有興趣嗎?作者: lleung 時間: 2006-6-26 08:58
yes, i have. I will call you later today.