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New adventure in TPA land. Its the 1 click bridgeable ZK-3002 board

Gaspar74

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Jun 11, 2021
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After having my latest board I took a chance on die a sudden abrupt death. It was a dual chip TP3255 based board from China, the Samp-200. The board had a lot of promise and sounded fantastic till it blew up one chip through no fault of my own. I decided to try another board that been getting attention due to its feautures and ability to be eith PBTL or BTL wth one clicvk as well as adjustable gain, passive or active cooling and price of Lg pizza! This board is the ZK-3002 by Wuize Audio. My plan is dual mono w dual supplies. I sourced these boards seperately. I bought one just to try it see if it is up to the job or another POS. So for now Ive got just one of these installed. For power supply I have 2 Meanwell EPP-300-48 single supply cageless units. Installed only one for now. Im waiting on the other one to show up hopefully by the weekend. Heres some pics of the board as well as it mounted in my chassis along with other parts, EMI filter, Linear regualtor for powering LED front panel as well as fan in chassis blowing on supply etc.
 

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Watching this to see your results. I tried that exact board about 1 years ago but they had design flaws with the feedback circuit and it blew. From day 1 it would cut in and out with anything other than quiet listening. Wuzhi is supposed to have fixed it and I would like to get another if the design is working now.

Where'd you get that enclosure from? I like that!
 
its been solid since building it now. I run it everyday and hard at times. Enclosure is from a Episode EA amp I got on ebay that the amp was dead so gutted it. Cost me 50 for the enclosure. Works excellent. Lots of room and reusable stuff.
 
The day before yesterday, my TPA3255 amplifier broke down—likely unable to withstand the thermal load of 2x200W at 3.9 Ohms. After measuring it, I turned the volume down to zero and stepped away to make a coffee. When I checked the power consumption from the mains, it was drawing 200W, and the resistors (4x3.9 Ohms/50W each) were incredibly hot. On one of the amplifiers, the output showed 48V minus 0.6V, leaving 47.3V at the terminal and 24V at the expensive one. Thankfully, it was connected to resistors and not speakers.

It seems that when the power transistor fails, the thermal protection circuit also ceases to function. I ordered a replacement board yesterday because this integrated circuit is notoriously sensitive to thermal overload. I also know that the temperature on my heatsink was at 65°C, and when I used the fan, it dropped to 39°C.
 
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TPA3255 2x230W Musik 3_9Ohm DC 48V.jpg

I ordered this board, as seen in the photo, six years ago. It was one of the first available on the market. I ran it without active cooling, which unfortunately meant it didn’t last much longer. Nonetheless, I managed to measure a music output of 30V at 3.9 Ohms, equating to 2x230W.

I’m now waiting for a board identical to yours. To my knowledge, there isn’t another one with this active cooling feature.
 
I connected my board and powered it using the Mean Well HRPG-600-48 power supply, which is controlled via a small signal line. The board performs exactly as Texas Instruments specifies in the brochure: delivering 30Vrms at 3.9 ohms, equating to 230W. I measured the power draw from the socket at 565W. When you account for 460W plus 60W of heat dissipation, we arrive at 520W, and adding the extra 10% heat from the power supply brings the measured figures into alignment.

The active cooling system operates quietly yet is highly efficient. I didn't dare activate the automatic function. The standard temperature hovered around 32°C. During regular music playback, I observed up to 32Vrms, with heat levels remaining consistently at 30°C.

What’s particularly interesting is the power supply fan control. It’s not temperature-regulated but instead responds to input current. The fan’s operation synchronises with the rhythm of the music, creating an amusing effect. At moderate volumes, around 18Vrms at 3.9 ohms, the fan completely shuts off and only re-engages when necessary.

WhatsApp Image 2024-09-18 at 14.48.42.jpeg
 
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