Thanks to Yatsushiro‘s help to reply the PE ground question.
With increasing the value of the resistor at the I/O buffer board, it can slightly keep the unit gain for the I/O buffer.
And, for the toggle switch, you can take it as the soft switch, it will shut down the Main SMPS, and the aux SMPS only can output 12V to save power.
Thanks, Eric
With increasing the value of the resistor at the I/O buffer board, it can slightly keep the unit gain for the I/O buffer.
And, for the toggle switch, you can take it as the soft switch, it will shut down the Main SMPS, and the aux SMPS only can output 12V to save power.
Thanks, Eric
Your amp is nicely done! I think it's the first one pictured here that's using RCA inputs. Did you get the SE versions or modify the balanced input boards?
Thanks for the suggestion. I'll update the first thread to consolidate this information ~
Something like this is easier to glance at:
FFA001_V3
Output: 2x150W @ 4 / 8ohm
Input: 85--265Vac, constant power SMPS
Size: 90x150mm
Price: USD$49.9/Unit, w/o shipping
Notes: Can be configured as a high-bass mode. CH1=300W@4OHM and CH2=120W@8OHM, similar to the Pascal U-PRO2
FFA002_V2
Output: 2x350W ...
Input: ...
Size: ...
Price: ...
FFA002-V1
Output: ...
Input: ...
Size: ...
Price: ...
Notes: variant with MOSFET mounted at the bottom side of the PCB
FFA003
Output: 1x350W ...
Input: ...
Size: ...
Price: ...
You can always add more to the list in this format and potential buyers can easily keep track of your offerings.
Hello Friends~
Please refer below Pic to modify these two resistors to 49.9K or above to keep the unity gain for the I/O board. Currently, there is a 6dB gain in this board.
Thanks,Eric
Please refer below Pic to modify these two resistors to 49.9K or above to keep the unity gain for the I/O board. Currently, there is a 6dB gain in this board.
Thanks,Eric
What about the balanced input I/O board? What gain does it have as delivered? How can we bring it to unit gain, as with the RCA board, above?
Eric,
just want to confirm on the FFA003 boards the solder pad marked AGND Is to be used to tie to a ground loop breaker?
Bill
just want to confirm on the FFA003 boards the solder pad marked AGND Is to be used to tie to a ground loop breaker?
Bill
do you have a recommended point or do you not recommend a ground loop breaker and just ground to the metal case?
No special requirement for this AGND pad, only screw all the mounting holes to the metal case is ok
I have no issues with ground loop, I put all screws on all the mounting pads. Think you should try it out and see if there is any problem at all.
I have 3 FFA001 doing endpoint duty for Roon around the house. This is the FFA003 and will go into my main listening system in the living room and I want it to be as good as it can be. I am having the face plate at a machine shop being milled for meters and power switch. Putting these into the chassis was like trying to put 12 tomato’s into a can.
Attachments
What about thermal management? If I put some FFA001 (i'm still waiting for the FFA003) in that enclosure those things would melt.
Oddly the FFA003 seems to run cooler than the FFA001, but I did put some holes in the side and the top is vented. This is what I did on my first FFA001 and it seems to run cool enough.
Attachments
Last edited: