It's a real capacitor between smps secondary and primary ground areas, you can find that big smd capacitor near hole #9.There is a 300pF capacitance measured between this hole and PCB ground (Hole #9). I don’t know if it is due to a real capacitor (component) or it is parasitic.
Hi, Mga2009Hi Erica,
Do you have any developments on the 2 channel amp + DSP?
Cheers and good luck
Good luck with that project!Hi, Mga2009
Currently, there is no such development plan, but now a friend invites me to develop a personal network player, which is similar to combining this power amplifier module with the Raspberry Pi, adding a big size touch screen and making a streaming media player. We are preparing to do prototypes after the new year.
Thanks,Eric
Could not agree moreGood luck with that project!
To bad there is no plan for the development of DSP + AMP. Here in the DIY scene are eager for a good (and powerful) plate amp with 2 (or 3) channels + DSP to make our active speaker dreams come true!
Honest question, I've seen several options for plate amps + dsp (minidsp, daytonaudio, getshow, hypex, etc)... what's wrong with them?To bad there is no plan for the development of DSP + AMP. Here in the DIY scene are eager for a good (and powerful) plate amp with 2 (or 3) channels + DSP to make our active speaker dreams come true!
A steaming integrated with multiple inputs and subwoofer outputs would be good. The Yamaha WXA-50DS doesn't have much competition. There's space in that market. WIIM plus this module can do the job well.Hi, Mga2009
Currently, there is no such development plan, but now a friend invites me to develop a personal network player, which is similar to combining this power amplifier module with the Raspberry Pi, adding a big size touch screen and making a streaming media player. We are preparing to do prototypes after the new year.
Thanks,Eric
Honest question, I've seen several options for plate amps + dsp (minidsp, daytonaudio, getshow, hypex, etc)... what's wrong with them?
mmmm I see.I am kind of looking for something a little bit bette, maybe not SOTA, but good... with a GOOD ADC and a GOOD DAC.
Do you have any feedback on the Getshow plate amps?¿mmmm I see.
I don't.. what I will do a some point is to order some FFA001 HB version with a front end from minidsp, that would be fun.Do you have any feedback on the Getshow plate amps?¿
Hi, RandyHello Eric
What modules do you have available now? Are there any of the larger ones ready?
Thanks and regards
Randy
... On amp and smps pcb near main rectifier and three blue capacitors it is connection for EMI filter ground, you need to use that connection for optimal EMI filtration.
Today I listen that small amplifier, for his price its sound really good. I don't have any noise oe hum. I used just ground connection just EMI filter so it was impossible to have an ground loop. ...
I put amplifier in some aluminium box and grounded all mounting holes and.... noise, no hum, no nothing, just deep silent.
...
Main board:
There is no direct (DC) connection between any of the mounting holes.
Hole #9 is directly connected to the PCB ground. ...
Hole #1 is capacitively connected to Live and Neutral AC mains input (P1 connector, pins 1, 3) through 1nF capacitors. It serves as the grounding connection for the mains LP input filter.
...
RCA input buffer board:
Buffer board is connected to the main board through the ribbon cable. It’s ground plane is an extension (0 Ohm) of the main board general ground.
...
Input RCA barrel is each connected to ground through a 0 Ohm smd resistor
...
Here are some summary details of my build in case it's helpful reference for others:
- Chassis is a Galaxy 2U 330x230, with full vented top and bottom from the diyAudio Store
- Modushop cut the IEC opening and screw holes as part of my order
- Three FFA001 modules plus the XLR I/O boards from the beginning of this thread are in the chassis
- There is JUST enough room or all this laid out flat in the chassis I have (though the I/O boards are mounted above the amp modules so that there is room for XLRs above and speaker binding posts below
- Mains inlet is a Schurter 4304.6090
- Mains earth ground is connected to the chassis (with anodizing sanded away)
- Mains AC is connected in parallel to the three modules
- XLR input openings/mounting hole screws and speaker binding post holes are hand drilled
- Fan(s) were tried but not successfully implemented due to spacing and noise issues
- Eric has addressed the noise and voltage issues with fan circuit in the updated I/O boards, which I have not tried (https://www.diyaudio.com/community/threads/2x150w-amp-module-for-sale.388868/post-7181561)
- Three modules in my chassis get warm under normal use, but not worryingly so (I have no concerns about the heat in my build)
- XLR-to RCA adapters work fine for me (https://www.amazon.com/gp/product/B07RQNGDF2/)
- The build performed very well in my main stereo rig and sounds very good
- I tested the build with a MiniDSP Flex Eight for multi-channel experimentation and it worked well