Well said commstech. I agree. I wouldn't bad mouth thr 3e board as it has served me well and sounds very good to my ears. I hear you regarding the support and back up. I have products from Ian Canada, XRK and Salas in my hi fi rack and these are all guys on here that help out their client base constantly. Also the feedback from the customers requirements and observations is fed back to the designers and this improves the product.
And it is good to see that Lester is on here similarly to the aforementioned to help us with our projects. Which is why I have decided to buy an amp from JLE!
And it is good to see that Lester is on here similarly to the aforementioned to help us with our projects. Which is why I have decided to buy an amp from JLE!
Indeed,
my choice of words in the last sentence I posted there was not the best but I kind of got frustrated because he was avoiding to provide some answers.
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Hello
I went from a lrs350 power supply to a Connex 300rs power supply, minimum mains connector ditto aux power supply, only positive point the dimensions of the 10cm * 10cm card and aux power supply, listening big disappointment, sound without dynamics, workshop direction, to the oscilloscope, the HF residue and peaks, change capa 2200uF / 63v by Nichicon HW, the same as on the TPA card, only a small HF residue remains, listening I find the sound with the lrs350, to hear in a few days
Best regards
Roger
I went from a lrs350 power supply to a Connex 300rs power supply, minimum mains connector ditto aux power supply, only positive point the dimensions of the 10cm * 10cm card and aux power supply, listening big disappointment, sound without dynamics, workshop direction, to the oscilloscope, the HF residue and peaks, change capa 2200uF / 63v by Nichicon HW, the same as on the TPA card, only a small HF residue remains, listening I find the sound with the lrs350, to hear in a few days
Best regards
Roger
Out of curiosity, will there be any option in the future for the TPA3255 (or upcoming TPA3251) for a fully-assembled module that includes all opamps, caps, inductors, heatsink(s), etc. installed?
Also, are all options coming with the faston tabs installed or can they come loose in case someone wants to directly solder the speaker output wires to PCB?
Also, are all options coming with the faston tabs installed or can they come loose in case someone wants to directly solder the speaker output wires to PCB?
I am sorry, i don't really understand. Are you saying that despite changing the 2200uf/63 capacitor on the Connex 300RS to Nichicon HW, a small amount of HF residue remains ? And at the end of it, you still prefer the LRS350?
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Deleted member 148505
Thank you guys!
I already have a ready to run module, but the shipping is quite expensive even for a postal type shipping.
Partially assembled kit is still better if you can get the parts locally.
TICore260BTL TPA3255 PFFB Post Filter Feedback (Ready to Run) Amplifier Module | jlelectronicsph
Can you measure the amplitude of the residue on SMPS300RS?
200mVp-p (70.7mVrms) for LRS-350-36 I think is the rating for 9.7A full-load.
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Deleted member 148505
Really excited to see the progress. Too bad I probably won't go for it even if it's way better than your TPA3255 already (I would have to buy another SMPS).
I have exactly the same PSU for your TPA3255 board. Do you plan to modify it? AlexScan and bobo le chat suggest that the capacitors change is needed.
As I browse through Mouser, I did not find snap-in caps that are "good enough"
So which one through-hole to buy?United Chemicon KZN, 2700uF/50V, Z=0,013 at 100kHz, 4270mA ripple, EKZN500E272MMP1S
United Chemicon KYB, 2700uF/50V, Z=0,013 at 100kHz, 4100mA ripple, EKYB500ELL272MMP1S
Nichicon HE, 2700uF/50V Z=0,014 at 100kHz, 3800mA ripple, UHE1H272MHD
Nichicon HW, 2200uF/50V, Z=0,019 at 100kHz, 3430mA ripple, UHW1H222MHD
The question is - Do the United Chemicons with better ESL and ripple have the same quality and "sound" as the famed Nichicons HW/HE ?
It's not bad. But more importantly, it's not something you should be able to detect (with your ears) in pretty much any realistic situation.
D
Deleted member 148505
Yup with his linear supply, the ripple in the TPA3255 output (with no signal) will be in the uVrms range, nothing to worry about.
Looks good to me.
Switching supplies also have a small low frequency ripple (that's why I'm using good switching supplies when I measure THD+N to get rid of the annoying 60hz ripple when I'm using a simple linear supply), so in the specs 200mV peak-to-peak refers to the high frequency noise spikes. (see attachment snva871, I was wrong in converting 200mVp-p to 70.7mVrms). Also requires proper measurement to get the actual noise figure.
TPA3255 PSRR is rated at 1kHz so we don't know its PSRR at higher frequencies, most probably poorer.
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D
Deleted member 148505
KZN series looks promising, leakage current specs are the same. Though we can never go wrong with tried and tested products so personally I'd go with Nichicon UHE
I have exactly the same PSU for your TPA3255 board. Do you plan to modify it? AlexScan and bobo le chat suggest that the capacitors change is needed.
As I browse through Mouser, I did not find snap-in caps that are "good enough"
United Chemicon KZN, 2700uF/50V, Z=0,013 at 100kHz, 4270mA ripple, EKZN500E272MMP1S
United Chemicon KYB, 2700uF/50V, Z=0,013 at 100kHz, 4100mA ripple, EKYB500ELL272MMP1S
Nichicon HE, 2700uF/50V Z=0,014 at 100kHz, 3800mA ripple, UHE1H272MHD
Nichicon HW, 2200uF/50V, Z=0,019 at 100kHz, 3430mA ripple, UHW1H222MHD
The question is - Do the United Chemicons with better ESL and ripple have the same quality and "sound" as the famed Nichicons HW/HE ?
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D
Deleted member 148505
Nice! It has very good specs. Hopefully Roger will be able to compare the improvement on residual noise of his SMPS.
What cap did you use? While mixing out Silmic II and Muse caps I found out that most of the 'bloom' sound comes from Nichicon Muse, though in some opamps, the bloom sound is not so noticeable..
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