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Low voltage solution +WARNING+


 

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WARNING
+++++++
I purchased three of these (see URL below) a few weeks ago. Perhaps I received a faulty batch but all three of them performed the same.

On a 'soak test' with an input of 14.2v and a 1R load on the 5v output. The 100uF 50v wkg capacitor next to the input terminals reached such a high temperature that I received a blister to my finger when I picked up the board. This was only after the unit had been supplying power for a few minutes. I doubt the capacitor will last for long before failing, perhaps causing the demise of the powered equipment.

I dont have a means of measuring the temperature it reached but it was hotter than my Weller soldering iron tip. I assume that this is caused by the current flowing through the cap, because 14.2v across a 50v cap should'nt get vaguely warm. The other 100uF 50v cap on the board was relatively cool, having only been heated by the dissipation of the silicone devices on the board.

Your experience may be different, but I would recommend a soak test before committing this board to use.

hth, Mike G8NXD


On 09/11/2024 13:15, Kevin Gray via groups.io wrote:

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  • Note: Input different voltage will output different power: input DC 9-24V, output 5.2V/6A/30W; input DC 24-32V, output 5.2V/5A/25W; input DC 32-36V, output 5.2V/3.5A/18W.


 

Maybe the cap is defective. I’m no expert but it sounds like it’s pulling too much current, for some reason. You should setup an amp meter to find out how many amps are going through it
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73,
Robert, AG6LK


 

Hello.
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Or maybe the capacitor is soldered the wrong way (inverted polarity)...
That's a default I saw on some industrial boards, it was with tantalum capacitors, they got very hot and then... exploded !
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73 from Fabrice, F5HCC.
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does? anyone? have? the? ?url? for the? ?wallwart? power supply? for? the? ?pi5 (26w)?
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i have? seen? it but now? cannot? find it.. i am using? ?HF? aprs? and? need? more? power? for the? maps.
?
tnx? NIece


 

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Most anywhere that sells the Pi is going to have the power supplies.

Mick - W7CAT

----- Original Message -----
From: "Niece KA1ULN via groups.io"
To: [email protected]
Sent: Wednesday, March 19, 2025 06:51:10 PM
Subject: Re: [RaspberryPi-4-HamRadio] Low voltage solution +WARNING+

> does? anyone? have? the? ?url? for the? ?wallwart? power supply? for? the? ?pi5 (26w)?
>
> i have? seen? it but now? cannot? find it.. i am using? ?HF? aprs? and? need? more? power? for the? maps.
>
> tnx? NIece
>
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>
>
>
>
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It's actually 27W

https://a.co/d/gUKGlHi


Get


 

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Watts the difference?? lol

Mick - W7CAT

----- Original Message -----
From: "N5XMT via groups.io"
To: [email protected]
Sent: Wednesday, March 19, 2025 08:08:11 PM
Subject: Re: [RaspberryPi-4-HamRadio] Low voltage solution +WARNING+

> It's actually 27W
>
>
>
>
>
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>
>
>
>
>
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