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The pop its only when power off and sounds one second aftre press the power button.

According to the seller you have to connect to positive. Connect to 9V from the same socket.

The MUTE doesn't work for me.

@daniboun , You can tell if the MUTE works in your TPA3255 HanZao version. In my TPA3251 board it does not work neither putting the pin to GND or to 9V.

The amp don't mute when MUTE pin its connected to adjacent GND. I do not understand in the seller's description how get the standby state with the mute terminal. https://es.aliexpress.com/item/1005001708348283.html?spm=a2g0s.9042311.0.0.274263c0tCNCDN

The pop appears only when power is turned off. The board self MUTE 5 seconds when the power is turned on to prevent the pop on power-on. The two-circuit power switch its a simple and good solution, but its difficult to find a small two-circuit switch to fit in the 12mm hold in this small case.

The HanZao TPA3251 is now working. At the moment I have tested it with 4558 and NE5532 while waiting for the OPA1692 to arrive. It sounds great and I hope it will sound better with the OPA1692. No background noise and no pop on power-on. But if there is a pop one second after power-off. I don't...

Hi daniboun, I don't have the amp assembled and I haven't been able to test it. I'm finishing other projects and I don't have much time left. As soon as I have it tested, I will send my opinion. At the moment I have put a originals 5532 for replace the 4558. I want to try the OPA1692 that...

Meanwell EPP-200-27

Proved inside BRZHIFI BZ1306 case (131*249*55mm). Seems to fit well. I want to upgrade the current 4558 op-amps with better ones and the power switch supplied with the box with one with light. The hole of the power switch is 12mm, any recommendations for this case? The HanZao volume pot is...

Just received the HanZao board with the TPA3251 and the power supply.

Today, after 10 days from the order, the tracking indicates that it has been deposited in the transport office. Now we just have to wait. Its a TPA3251 versión of the board.

Seems to be the same board as the TPA3255 that comments @danibound in https://www.audiosciencereview.com/forum/index.php?threads/which-tpa3255-amp-do-you-recommend.9148/post-701314. I am waiting for a 3251 version and I will tell you my impressions when it arrives. The seller has generated a...