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Deleted member 148505
On loud room music listening, it's very easy to clip the amp when a 24V supply is used specially on low sensitivity speakers.
If THD+N is your concern, best compromise would be around 36V to 38V, or maybe up to 43V.
Based on my tests, my module is losing 2dB to 3dB THD+N at 5W 4ohms 1kHz (mostly +N part), if I increase the supply voltage to 51V as compared to when using a 38V DC supply.
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Puffin,
Would you be so kind as to open it up and take a few pictures of its internals? AFAIK, it's one of the cheapest ready-to-go TPA3255 amps out there, with (supposedly) DSP capabilities thrown in for good measure
Based on my knowledge of amplifiers using similar chipset, many people reported that upgrading to a 48V (Meanwell) SMPS is a bit overkill, and there's no noticeable change in SQ compared to say a common 32V brick charger. Cleaner power certainly won't hurt.
K.
@Karlsonate. I have had many Class D amps, most of which were boards that I modified as a result of the numerous threads on here. Some chips (the TA2024 in particular} would blow if you so much as looked at them in the wrong way! I would be unhappy to open it up just in case I look at it in the wrong way.....if you know what I mean. Unless and until there is a thread on here regarding upgrades or tweaks that could be done to it, it will remain intact.
Best Wishes Puffin.
Best Wishes Puffin.
Not sure if this is the best place to post this but guessing so.
Really enjoying having my D200 back in the system. Recently I acquired XRKs diamond buffer (unity gain).
Not expecting to be able to better Lesters design at all, but this being DIY and we like to try different things, I was wondering about using the diamond buffer in place of the opamps on the D200. The diamond buggers are SE. Is this feasible/ worth bothering with?
Thanks
Really enjoying having my D200 back in the system. Recently I acquired XRKs diamond buffer (unity gain).
Not expecting to be able to better Lesters design at all, but this being DIY and we like to try different things, I was wondering about using the diamond buffer in place of the opamps on the D200. The diamond buggers are SE. Is this feasible/ worth bothering with?
Thanks
Hi Jim,
D200 is configured as BTL with differential inputs.
You need a balanced driver if you want to bypass the preamp, also, you need to run the amp in non-pffb mode if you were to bypass it.
Remove the opamps and connect the balanced driver to pins 1 (hot) and 7 (cold) of the opamp socket.
Regards,
Lester
Gain of TPA3255 is fixed regardless of the PVDD supply voltage, so yes, it should have the same volume all throughout the supply range if early clipping is not of your concern.