So you will have the following available within the next 1-2 months (?):ETA for my new TPA3255 module will be 3 to 4 weeks. I will change its name and drop the 'Core' naming to avoid sounding like a knockoff lol.
1) TPA3255 module, original (TICore260BTL with new name) but tweaked/improved
2) TPA3255 module, upgraded with split supply
3) TPA3251 module
Or just 2) and 3) moving forward?
What's the thing on the top-right, is that a volume control for later?
A 100K pot. This is a used enclosure box from an old project. I will not use the the pot with the TPA3255 board.
I disabled the PFFB circuit. At first listening, better headroom and natural voice. It's easy to heard as I'm using full range speakers.
It’s weird. The PFFB shouldn't cause such a big difference in sound.
Stéphane
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Hi Folks!
Just to show you my TICore260BTL v1 assembling with a Connex SMPS600RS 48v PSU. Works well.
I used LME49860MAX (not on the pic) and United Chemi-Con KZE 1800uF 63v.
Works fine on a paire of old JBL speakers.
Sincerely,
Stéphane
Hello
Good Job!
I like old JBL speakers.
Best regards
Roger
I disabled the PFFB circuit. At first listening, better headroom and natural voice. It's easy to heard as I'm using full range speakers.
It’s weird. The PFFB shouldn't cause such a big difference in sound.
Stéphane
Stéphane: A number of us have noticed this with version 1 of the board. I’ve disabled mine as well and the sound reproduction is much more pleasing. Version 2 of the board is addressing this I believe.
Cheers,
Pete
D
Deleted member 148505
So you will have the following available within the next 1-2 months (?):
1) TPA3255 module, original (TICore260BTL with new name) but tweaked/improved
2) TPA3255 module, upgraded with split supply
3) TPA3251 module
Or just 2) and 3) moving forward?
Only number 2 is the priority for now. I made some changes on it that I will apply on 1 and 3 afterwards.
The manufacturing cost went more than x2 compared to Version 1. (I used low TCR 0.1% resistor and C0G caps in some areas) So I removed the ENIG surface finish to lower down the cost.
Stéphane: A number of us have noticed this with version 1 of the board. I’ve disabled mine as well and the sound reproduction is much more pleasing. Version 2 of the board is addressing this I believe.
Cheers,
Pete
Sound's like the 2 channels are slightly out of phase that's why the voice is not as full as the non-pffb. I will experiment with it once I receive the new boards.
Hi Le chat!
These ones.
super JBL L75 Minuet with LE8T.
At home L300 / 4333 components except tweeter which is an Audax ring compression and N Pass filter
ETA for my new TPA3255 module will be 3 to 4 weeks. I will change its name and drop the 'Core' naming to avoid sounding like a knockoff lol.
An idea of the dimensions of the new pcb
Best regards
Roger
D
Deleted member 148505
Tried removing the opamp feedback caps in my TICore260BTL.
Opamps are not heating up (LME49860) so looks stable. Also no faults on open load. I'm using LRS-350-36 PSU which has a 65kHz switching freq.
PFFB: The sound is noticeably better and the vocals are more natural (almost the same as non PFFB)
I'm using ELNA Silmic II all throughout, I soldered them under the board so that I can easily modify the opamp feedback caps.
Maybe a 22pF on opamp buffer feedback cap on my board will suffice for stability.
I need more listening tests to confirm.
Opamps are not heating up (LME49860) so looks stable. Also no faults on open load. I'm using LRS-350-36 PSU which has a 65kHz switching freq.
PFFB: The sound is noticeably better and the vocals are more natural (almost the same as non PFFB)
I'm using ELNA Silmic II all throughout, I soldered them under the board so that I can easily modify the opamp feedback caps.
Maybe a 22pF on opamp buffer feedback cap on my board will suffice for stability.
I need more listening tests to confirm.
Attachments
OMG the details and air are incredible!
Feedback caps are still disconnected Lester?
Pete
Tried removing the opamp feedback caps in my TICore260BTL.
Hi Lester!
C1, C2, C3 and C4?
You removed all them or replaced them with a strap?
Stéphane
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D
Deleted member 148505
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