Look at my new linear powersupply from China

Audio Gear Everything else
42

Yes, the capacitors also look different, but the big blue component also shows a different output. Makes you wonder if they just put in whatever component is available/cheaper, or if is this a designed upgrade.

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43

haha, I didn’t see it before.
Indeed left is 9V output from the Talema, which means more heat dispensation on the voltage regulator.
That’s the reason why the left is getting way hotter.
Guess they ran out on the 6V output ones

44

Hi @Wheaten,
I’ve always had the voltage output set to 5.14 V after reading your suggestion, but now, with the Raspberry Pi 3B+ and Topping D50 III DAC, I tried turning up the voltage a little bit. I noticed that at 5.20 V, the voltage remains stable and only drops slightly (to 5.19 V) when I turn off both connected devices.

If I set it even a little bit lower (like 5.19 V or 5.18 V), it oscillates continuously between 5.16 V and 5.18 V.

I’ve now left it at 5.20 V. Do you think it is safe, or is there a risk that this voltage could be too high and damage the components in the long run?

Thaks in advance

45

I received the same unit last week. I just opened it up and it is exactly as the unit on the left with the 9V talema. It gets very hot.
Is there anything I can do to cool this down? Will it cook itself to death?
What a dsiappointment!

46

I don’t think it will cook itself to a death. The only thing you can do is adding active or passive cooling.

47

The voltage requirement for all model Pi’s is 5V +/- 5% (min 4.75V, max 5.25V ) which is the USB standard.
SO I do hope you’ve measured the voltage with a DMM and not fully rely on the disp.

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48

At the moment I only have a USB Tester at hand and, hoping I used it correctly (input on the power supply, output RPbi first and Topping then), these are the values:

49

These cheap chinese psu’s
The one above with the 9v transformer a quick calc at 5v can probably only supply just over 2A and at that current draw you are losing alot of power through the regulator (14 watts ish has to be dissipated as heat)
Thats why it gets so bloody hot

50

I can get the correct transformer for $35.00 at digikey.

https://www.digikey.ca/en/products/detail/talema-group-llc/70060K/3881331

Could I just drop in a 7v transformer? Or would the rest of the circuitry need to change?

51

Can you tell us what the writing says on the black capacitors. ( Those 4 black things standing beside the Transformer) txs.