There are lot of low cost 31V switching power supplies for LED
chains. Typically
they look like this. See here internal
pictures of a switching power supply.
But, those power supplies are interfering ham bands especially when the LED chain is long. My neighbor has abt 30 meter long LED chain which was interfering badly on lower bands. I installed a filter choke on the DC output but it did not help at all.
Then I designed this 31V/6W linear power supply and the interference is now gone.
The linear 31V power supply with cover open. The mains PE wire is not connected.
The transformer
has 4000V insulation strength.
6VA PCB mounted transformer
with T250mA mini fuse in a socket. Board size 81 x 69mm.
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LM317 as a linear voltage
regulator with copper areas on both sides for cooling.
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Another internal view
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All tightness class IP65. |
The original DC socket installed
to the enclosure with silicon seal.
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Downloads
- Schematics (PDF)
- Layout (PDF)
- BOM (Excel)
- Gerber files (ZIP)
Update 2024-09-29 OH7SV
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