Amplifier Modules and PCBs For Sale

[Deleted member 148505]

Lester,

Do you have graphs of THD+N vs frequency for the single/split-supply boards? Alternately, harmonic distortion at 5 kHz, 10 kHz inputs?

Please give us up to 2 months to publish performance graphs.

Regards,
Lester

 

[454Casull]

Understandable for the Sylph, but do they not exist for the TICore260BTL either? Or do you just want to publish for only the latest revisions?

 

[Deleted member 148505]

For TICore260BTL I only have the latest version here, the earlier revisions were already sold out.

 

[Deleted member 148505]

Here's Sylph-D200 with TPA3255 chip, PFFB (power supply is 38VDC)

Right channel is A+B, Left Channel is C+D

I need to upgrade my soundcard interface's power supply since the noise floor is high. After I upgrade it, then I will be confident to publish the result.

Early publishing of full measurements might contain inaccurate data.

 

[Deleted member 148505]

I found the TPA3251 slightly cleaner sounding, but there's a pop on voltage supervisor's mute/unmute event. Cstart = 10nF

 

[454Casull]

Awesome early results. Really looking forward to harmonics vs frequency and multi-tone measurements (full-spectrum, 1+5, 18+19)

 

[Deleted member 148505]

Awesome early results. Really looking forward to harmonics vs frequency and multi-tone measurements (full-spectrum, 1+5, 18+19)

Thanks

 

[Deleted member 148505]

5W 8 ohm left and right channels.

When the output is low current, C+D BTL channel has lower THD.

 

[Deleted member 148505]

10W 8 ohm left and right channels

Notice that A+B channel has lower THD on higher current output.

Although it's also possible that the wiring/connections are the culprit.

 

[454Casull]

The system you are running for those measurements, is it with a linear supply or SMPS?

 

[Deleted member 148505]

It's SMPS. Using smps300rs and lrs-350-36 get the same thd result.

The sensitive part now is the wiring. Alligator clips to faston terminal produces worse result than using female faston tabs. That's why I also check the output current via clamp meter to verify if I'm getting solid connections to the dummy load.

 

[Deleted member 148505]

TPA3255 8.9Vrms/1.1Amp output has lower THD than most cheap soundcards lol

If we measure it at 8 ohm 1W, or lower output current, the measured THD will get into 0.0003% territory.

 

[454Casull]

Yeah... already know it's going to have basically zero distortion at 1 kHz I would only be using these modules for 1 kHz and up so it's the 2-10 kHz range that really interests me (and which TPA3255 typically struggles with)

 

[bobo le chat]

Hello
very good, but what does your sister think?
For the measurements you know the solution, a shielded cable soldered to the test point with shielding as close as possible, an oscilloscope probe without the wire grip also works well, but it is very restrictive, it is class D!
Regards
Roger

 

[Deleted member 148505]

Hello
very good, but what does your sister think?
Roger

Still tuning and configuring the sound so I'm not asking her for review yet.

I'm rotating the modules so that I can compare their differences.

As expected, the removal of front caps made the Sylph-D200 sound more transparent, so the source player / DAC and song material should be of higher quality as it exposes minor details in sound.

TICore260BTL with single supply opamps is 'thicker' sounding, it adds some bloom and slight haze to the sound. Sylph-D200 is clearer and more hifi.

TPA3251 sounds more organic, but it might be just my bias lol.

Difference is not drastic, you will just notice it by A/B testing the two.

 

[454Casull]

For the production modules, will you / do you do the assembly yourself or do you have an assembly house do it?

 

[Deleted member 148505]

For the production modules, will you / do you do the assembly yourself or do you have an assembly house do it?

It will depend on future demand. For large quantities, I will outsource most of the work in assembly house.

 

[stef1777]

Hi Lester!

Do you plan to design a MONO PBTL version of the TPA3255 board?

With a very good damping factor.

Cheers,

 

[Deleted member 148505]

Hi Lester!

Do you plan to design a MONO PBTL version of the TPA3255 board?

With a very good damping factor.

Cheers,

Yes but after I release the latest version

 

[Deleted member 148505]

Update:

All TPA3251 = non PFFB
Sylph-D200 TPA3255 @48V = non PFFB

Sylph-D200 TPA3255 @36V = PFFB