Review of T100 differential amplifier

[CosteC]

I got new version of T100 differential amplifier described here: https://www.eevblog.com/forum/testgear/cheap-chinese-oscilloscope-preamp-tear-downreview-is-it-any-good/
New version has two LEDs at top: CHARGING and POWER.
PDF as my patience for forum formatting is limited

This version has amplifier with markings and redesigned power supply stage, questionably if for better - noise is still an issue.

Hope it will help.

Anything to be tested before I start tweaking this box?

[thm_w]

Since its the same product, probably makes sense to just post in that thread?
Maybe add some photos of the redesigned power stage and what noise you measured, thanks.

[CosteC]

Well, it is updated version, behaves differently but not much better... I got some parts gathered, time is now the limiting factor

[CosteC]

Yesterday attempt to play with component values was the failure.
Each power rail has 50 Ohm resistor and SMD coil in series. 50 Ohm resistor is more important for noise reduction than coil, however causes loss of 0.35-0.6 V when in idle state.
Removing 50 Ohms causes around twice higher output noise. No change in coil size, from available managed to help (up to 4.7 uH) Today maybe more experiments.