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2x150W Amp module for sale

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#383
A few observations relating to grounding after probing around the FFA001-V3 module. They are in agreement with stryx posting https://www.diyaudio.com/community/threads/2x150w-amp-module-for-sale.388868/post-7212954

Please see attachment 1 and 2

Main board:
There is no direct (DC) connection between any of the mounting holes.
Hole #9 is directly connected to the PCB ground. Thus there is also 0 Ohm between this hole and:
Negative speaker cables (P2 connector pins 2, 4)
J1 connector pins 3, 19, 20, 23, 24

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.
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.

Holes #2, 3, 8, 10 DC float. Holes #2, 3, 8 measure 860pF to Hole #9 (smd capacitors on each) and 220pF to Hole #1. Hole #10 measures 0pF to both Hole #9 and Hole #1

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.

Holes #4, 7 DC float. They measure 0pF to ground.

Holes #5, 6 are shorted together. Each is connected to ground through an 820 Ohm resistor in parallel to a small capacitor, thus they measure 410 Ohm to ground.

Input RCA barrel is each connected to ground through a 0 Ohm smd resistor

George
 

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#386
mga2009 said:
Hi Erica,

Do you have any developments on the 2 channel amp + DSP?

Cheers and good luck
Click to expand...
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
 
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#387
Erica.C said:
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
Click to expand...
Good 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!
 
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#390
Erica.C said:
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
Click to expand...
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.
 
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#391
Hipocrates said:
Honest question, I've seen several options for plate amps + dsp (minidsp, daytonaudio, getshow, hypex, etc)... what's wrong with them?
Click to expand...

-. HypeX --> top of the line, but expensive @ over USD$350 ea.
-. MiniDSP --> Hard to find and almost as expensive as HypeX
-. AFAIK Dayton does not have a full range plate amp with DSP with a decent Class D amp attached.
-. IDK that Getshow is, but after a google search it looks like a chinese/karaoke plate amp provider... I am kind of looking for something a little bit bette, maybe not SOTA, but good... with a GOOD ADC and a GOOD DAC.
 
#398
stryx said:
... 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.
Click to expand...
stryx said:
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. ...
Click to expand...
stryx said:
I put amplifier in some aluminium box and grounded all mounting holes and.... noise, no hum, no nothing, just deep silent.
Click to expand...
gpapag said:
...
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
...
Click to expand...

So, for a novice, if I were to use one of these, would I ground
  • Only the EMI filter ground (or #1 on gpapag's diagram)
  • All mounting holes
  • Some other arrangement that is apparent to someone more experienced?

I would be using this as a stereo amp, would I want the regular (not "High Bass") version?

I am not in a real hurry, so I could wait for the higer power version if it is not a lot more expensive - Has the price difference been mentioned and I missed it?
 
#400
von Ah said:
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
  • 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
Click to expand...

Hi @von Ah, that looks really good. I'm sort of new to this but it looks like loads of fun. Are there any clear documented instructions that one could follow to put a multi-channel amp together. I'm not an electronics engineer but would be comfortable following step by sep instructions.

By the way, I'm sure you tested the amp in your home theatre setup, how did it sound?

Also, I noticed the module offers 2 x 150W at 8 ohms, what is the rating at 4 ohms? Can the 2 channels be bridged?

Is there a more powerful module available?
 
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