(06-18-2020, 09:26 AM)frenchy Wrote: Hi Studi
I'm ordering one of those ES9038Q2M DACs and interested in trying it with a TPA3118D2 amp to drive some little Wharfedale 70w bookshelf speakers
Can you recommend something cheap off ebay?
Thanks!
Edit: I found this I think I'll give it a try!
https://www.ebay.co.uk/itm/TPA3118D2-Dig...3487748760
The TPA3118 data sheet informs about a maximum power of 2 * 30W for 8 ohms and 24V power supply. The first limit is the supply voltage - 26V. The second limit is the cooling method. The system is cooled by the copper surface on the printed circuit board. It is highly recommended that the thickness of the copper layer is 70um. If the cooling is insufficient, the power of 2 * 30W cannot be obtained. These 45W given in the picture attached to the auction are yes but as 2 * 22.5W. Another problem besides the PCB itself is the filter coils, it is not known at what intensity saturation will occur. These coils look similar to those on cheap boards ( https://www.google.com/url?sa=i&url=http...AdAAAAABAM ) where one TPA3118 chip will work as two bridge circuits working in parallel offer theoretically 1 * 60W at 4 ohms. About 45W turns out to be real. These boards have the disadvantage of a "step" of power drop around 90 Hz (frequency response), the reason is that the wrong capacitors were used at the input of the system. I bought a cheap 2 * 50W circuit board on TPA3116 ( https://www.google.pl/url?sa=i&url=https...AdAAAAABAU ). There are no negative or critical comments about the quality. I was tempted to seemingly better, MKT capacitors, coils of filters on large ring cores. ( https://www.google.pl/url?sa=i&url=https...AdAAAAABAH ). Unfortunately I was disappointed. Apart from the start and end positions of the potentiometer, this amplifier module hums. Low quality RCA sockets rhodium plated and not gold plated. Up close, the PCB itself turns out to be of poor quality of laminat and copper layers. Unfortunately, the appearance presented in the picture does not guarantee quality.
It's hard to honestly recommend something from the cheap Chinese modules offer. It can be satisfied or the purchase is unsuccessful. The risk is low due to low prices. The alternative is your own PCB design, ordering a PCB from a professional service provider making the PCB and finally soldering the system from the purchased components from reliable suppliers..
