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Forum Index : Electronics : Sus DC-DC Converters from Amazon

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Chopperp

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Joined: 03/01/2018
Location: Australia
Posts: 1121

Posted: 06:39am 25 Feb 2026

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I ordered & received 2pcs Constant Current CC CV Buck Converter Module DC 6-40V to 1.2-36V 20A 300W Adjustable Step Down Voltage Regulator Power Supply Module from Amazon.

I was checking one out when I noticed a slight problem with it which I fixed. I then went back to their Web page & looked at the pretty picture (shown below) & low & behold, that's how this one came. The other one was OK.

No prizes for spotting the problem.

Also, the switching transistors are NOT electriaclly isolated from their heatsinks which previous ones I've purchased have been. Neither is there any heat sinking compound used here. You get what you pay for I suppose. Forced cooling is also required to get anywhere near the output power claimed.

Brian

ChopperP

Godoh
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Joined: 26/09/2020
Location: Australia
Posts: 616

Posted: 08:06pm 25 Feb 2026

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Did they just leave the screw out that is supposed to bolt the transistor to the heatsink. Or is it so cheap that they never planned to fit one?
Pete

Chopperp

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Joined: 03/01/2018
Location: Australia
Posts: 1121

Posted: 12:18am 26 Feb 2026

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It was screwed in fairly tightly against the "flange"part. There is a very slight curve in the transistor (FET) tab. I will have to se if I can get some heatsink compound in there somehow
Brian

ChopperP

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