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| [#582] DAC -AH 輸出反相問題 Dear master 254, I just bought it at a computer shop made for RAM chip but the size fit very nicely to the 8 IC. http://www.x-cool.biz/product_info.php/products_id/64/Twesid/0f875175a0019305c6d9f50bf108d8ae |
pakyeahpo 正式會員202.xxx.xxx.142 |
2010-06-28 13:41 | |
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| [#583] DAC -AH 輸出反相問題 That is a "must" to do with the Hot TDA1543s. BTW, did you feel the heat of the few caps around the 3 regulators, 7805 and 7808 I think. Move them to a cooler place is better. They will dry up soon!! Just touch them, you will know what I am saying!! |
254mm 正式會員 203.xxx.xxx.150 |
2010-06-28 14:03 |
| [#584] DAC -AH 輸出反相問題 I am thinking about moving them actually but haven't worked out where to (maybe add a small PCB somewhere?). Also plan to move the transformer further away from the PCB as well, probably more work though. Good way to spend a weekend! |
pakyeahpo 正式會員 202.xxx.xxx.142 |
2010-06-28 14:25 |
| [#585] DAC -AH 輸出反相問題 Yeah, I always treat this kind of DIY as a release of the daily work pressure, whilst I was working in the most 乞人憎 department, IRD. I did made up a separate circuit board to place the 8 volts regulator( Using LT317A and fixed the output to 7.5 volts only for the TDA1543s)and the 220 Uf caps. Later, I found that I cannot accept other Dac when playing 老琴, if I only listen to 老琴, that is all right, keeping the DAC-AH, but frank, when switching to other music, DAC-AH is not as clear as other Dac. So I sold my moded DAC-AH out, but still missed it much!! |
254mm 正式會員 203.xxx.xxx.150 |
2010-06-28 15:03 |
| [#586] DAC -AH 輸出反相問題 I happen to own a DAC-AH. I wonder if you would be kind enough to mod if for me? Thanks. |
bkcmak 正式會員 210.xxx.xxx.113 |
2010-06-28 17:27 |
| [#587] DAC -AH 輸出反相問題 Dear 254 master, I have a question for you please. Since I am now replaced the output cap and direct solder to R35 & R36, is the Opamp part no longer required like the attached pic (borrowed from the web)? If yes, I might remove them to pave way for my power filter caps and the regulators. You think is a good idea though? Thanks.  最後修改時間: 2010-06-29 11:09:09 |
pakyeahpo 正式會員 202.xxx.xxx.142 |
2010-06-29 10:58 |
| [#588] DAC -AH 輸出反相問題 I don't quite understand your question, you need the OP-amp to give some 1.2--1.3 amplification. If you don'e use the Op-amp, then what's the use of the Caps and the regularors, +/- 15volts. May be I am not too sure of the circuit, after such a long lapse of time. |
254mm 正式會員 219.xxx.xxx.170 |
2010-06-29 23:12 |
| [#589] DAC -AH 輸出反相問題 I read from the web, some people bypass the Op-amp altogether as the outputs were taken directly from the TDS1543s but I just wasn't sure is this the good way to do it and not sure where the negative output connect to. Anyway guess I will leave it and just do the power filter caps....etc. Thanks. |
pakyeahpo 正式會員 202.xxx.xxx.142 |
2010-06-30 09:34 |
| [#590] DAC -AH 輸出反相問題 push!!!!!!!!!!! |
martingogo 正式會員 202.xxx.xxx.159 |
2010-10-01 13:43 |
| [#591] DAC -AH 輸出反相問題 from the picture you showed, the Op-amps has been by-passed. That is why all the parts have been removed away. The Rectifiers, Caps, Regulators, Caps. Op-amps and the output caps. Direct output from the pararelled TDA1543s. But may be the gain is not enough and the phrase is still inverted. That is why I put a negative buffer having a gain of 1.3 。 That is a complete difference。 |
254mm 正式會員 219.xxx.xxx.57 |
2010-10-01 15:14 |
| [#592] DAC -AH 輸出反相問題 Today, I changed all 7805 to 317 with +5v for cs8414. 7808 to 317 with +7.76v to TDA1543. also changed 7815 and 7915 to 317 and 337 with +-15v for op amp 627bm. sound very great background quite and clear. can compare with $6k-$8K Dac. just lower costs great retun. suggect to try. before also add the clock for CS8414 and follow 254 hing DAC -AH 輸出反相問題 repair. original. I want to buy MF M1 dac or CA MAGIC Dac. Now is no need to change anymore. only enjoy in music now. just for sharing. thanks. |
martingogo 正式會員 61.xxx.xxx.204 |
2010-10-20 22:07 |
| [#593] DAC -AH 輸出反相問題 forget to remind please refer 317 and 337 datasheet,because it must add two resistors to adjust the v and change the pins because it must match 7805, 7808, 7915 and 7815 pins. http://www.alldatasheet.com/ thanks. |
martingogo 正式會員 61.xxx.xxx.204 |
2010-10-20 22:20 |
| [#594] DAC -AH 輸出反相問題 我那負相 Buffer 線路, 令好多網友 (不止香港 )識我, 亦跟我咁做 |
254mm 正式會員 203.xxx.xxx.182 |
2010-10-21 00:09 |
| [#595] DAC -AH 輸出反相問題 martingogo, D TDA1543s 一定要加 Heat-sinks |
254mm 正式會員 203.xxx.xxx.182 |
2010-10-21 00:10 |
| [#596] DAC -AH 輸出反相問題 BTW, did you add a digital lock LED ?? |
254mm 正式會員 203.xxx.xxx.182 |
2010-10-21 00:13 |
| [#597] DAC -AH 輸出反相問題 no add a digital lock LED. add heat-sink aldy.. thanks. |
martingogo 正式會員 202.xxx.xxx.159 |
2010-10-21 18:44 |
| [#598] DAC -AH 輸出反相問題 OK, thanks for your supports |
254mm 正式會員 219.xxx.xxx.249 |
2010-10-21 22:12 |
| [#599] DAC -AH 輸出反相問題 剛改完一部 的確幾好聲 不過眼都濛埋! |
軍城 正式會員 112.xxx.xxx.236 |
2010-12-07 05:45 |
| [#600] DAC -AH 輸出反相問題 加 digital lock LED 燈就型仔好多, 粒原子粒任何 PNP 小豆仔得啦  |
254mm 正式會員 219.xxx.xxx.181 |
2010-12-07 06:37 |
| [#601] DAC -AH 輸出反相問題 because of the long lapse of time, can't remember which case is correct. The above is using PNP transistor and now I submit another circuit using NPN transistor, one of the two should work!!  |
254mm 正式會員 219.xxx.xxx.181 |
2010-12-07 06:49 |
