Looking forward to hear back from you Diytoon on the differences between the 2 boards! Glad you got it sorted!
Finally arrived...yuan jing board that is...
Started playing @23vdc...convertor now set @32vdc.
Not noisy...
First (cold) impression:
Seems a little warmer sounding than de 3e-audio board.
Good imaging, good bass extention, good details...
Make no mistake, both are very fine boards...but the YJ board may be a hit for less than 50 euro, shipping included...
3e-audio board looks a little more industrial, very neatly built...
YJ board looks more like DIY, but everything seems ok quality wise...
An externally hosted image should be here but it was not working when we last tested it.
They are still on them...
Cannot see what opamps are used...there is nothing on it...
I dont care...
I think doctermord knows...
The Mfrs have rubbed off the name of the op amps, perhaps.
People who have modded these boards have changed to better op amps. I was hoping that the Mfrs would have adopted those higher quality op amps in their design.
People who have modded these boards have changed to better op amps. I was hoping that the Mfrs would have adopted those higher quality op amps in their design.
Do you know if the njm4580 and LME49720 are pin-equivalents, I mean can they be swapped without having to change any other components?
You can read in threads here that lm4562/49720 will probably need serious shielding to be ok, even when not near to switching amp...
www.diyaudio.com/forums/chip-amps/160649-99-vs-dip-8-packing-lme49720-opamp.html
In this thread the discussion goes in favour of lme49720 in a metallic to99 package. The metal provides a shield from external signals.
They also say that the to99 sounds better than a dip package !!
In this thread the discussion goes in favour of lme49720 in a metallic to99 package. The metal provides a shield from external signals.
They also say that the to99 sounds better than a dip package !!
Hi did you check this board very detail?i am agree with you that this cheaper board is good for DIY but now i am getting disappointing.
i have some problem on it.
1. there is a very loud 'POP' noise when power supply drop during playing music through my phone, now i need to stop my music first before pull out the power supply......
2. the display LED always ON,i check the datasheet that it's' for clipping and fault indicate,now i don't know when it will clip or fault since it always working.(i did ask the seller but he said it's normal😕)
3. there is one IC not mounted,but the picture show on the selling page,it does has.(i did ask the seller but he said it's normal😕)
4. the RCA input and speaker output is not symmetrical,i mark in the picture.
i found there is also other option on Taobao marketing but looks not so nice but price is more higher,the worse is that they don't suggest diyer to buy it.😡
i still want to try 3e-audio one but seems they didn't sell on taobao,😕
TPA3251D2高清模拟输入D类放大器2*90+175W大功率2.1数字功放板-淘宝网全球站
this board sounds almost same with my TAS5630 board,still a little be far away from High Fidelity.
Maybe i need ask friend to have some measurement on it to see what is go on.
Attachments
Not an HV version of LM2575, max voltage for ampboard now 40V ??
Panasonic HD 16V or lookalike , 7.2ohm and underrated voltage according to TI datasheet.
No 3.3V PSU might just make the leds ON/OFF indicators.
TL072 (dual opamps so not like 49990)
Panasonic HD 16V or lookalike , 7.2ohm and underrated voltage according to TI datasheet.
No 3.3V PSU might just make the leds ON/OFF indicators.
TL072 (dual opamps so not like 49990)
What is the problem if the input and output are correctly marked?
In any case, you can check which input is appropriate for the output.