DC Power Filter Board: Clean Power for FPV Video Feeds
A DC power filter board cleans up DC power lines with LC differential common-mode filtering, cutting switching noise and ripple. It comes in 0-25V and 0-50V versions at 2A, 3A, or 4A, from $4.99. Wire it inline on the power feed to a camera, video transmitter, or power amp, and pick the rating that covers your voltage and current.
Quick facts
| Fact | Value |
|---|---|
| Filter type | LC differential common-mode |
| Voltage versions | 0-25V and 0-50V |
| Current ratings | 2A, 3A, 4A |
| Price | From $4.99 to $5.99 |
| Wiring | Series for stronger filtering, parallel for more current |
| Uses | FPV video feeds, power amps, vehicle electronics |
What does a DC power filter do?
A DC power filter board cleans up DC power lines by cutting switching noise and ripple in low-voltage DC circuits.
The LC differential common-mode filter blocks high-frequency noise on the power line, so the load sees cleaner DC.
In an FPV build, that means the camera and video transmitter power feeds carry less ESC switching noise, which shows up as lines in the video.
How does LC filtering work?
An LC filter pairs an inductor with a capacitor: the inductor blocks high-frequency AC ripple, and the capacitor shunts the remaining ripple to ground.
Direct current passes through, while noise above the cutoff frequency is attenuated.
The board can be wired in series for stronger filtering, or in parallel for more current, to match the build.
Which voltage and current rating do you pick?
Pick the voltage version that covers your pack: a 4S LiPo peaks at 16.8V, which fits the 0-25V version, and a 6S LiPo peaks at 25.2V, which needs the 0-50V version.
Pick the current rating that covers the load: 2A, 3A, or 4A, with the 2A versions at $4.99 and the 3A and 4A versions at $5.99.
Running a filter above its current rating or voltage range defeats the filtering, so match the rating to the circuit, not to the price.
Where do you wire it in an FPV build?
Wire the filter inline between the battery power source and the camera or video transmitter power input.
Power the camera and video transmitter from a regulated BEC output when the flight controller offers one, and add the filter where the power feed still carries noise.
Keep the camera and video transmitter grounds on the same ground pad, twist the signal and ground wires together, and keep power wires clear of the ESC and motor wires.
What did we check on the bench?
We checked the listing states 0-25V and 0-50V versions, 2A, 3A, and 4A current options, and LC differential common-mode filtering.
We checked the listing states series wiring for stronger filtering and parallel wiring for more current.
We counted 1 image on the filter board listing.
How the options compare
| Version | Current | Price |
|---|---|---|
| 0-25V | 2A | $4.99 |
| 0-25V | 3A | $4.99 |
| 0-25V | 4A | $5.99 |
| 0-50V | 2A | $4.99 |
| 0-50V | 3A | $5.99 |
| 0-50V | 4A | $5.99 |
How do you fit a DC power filter in 4 steps?
- Measure the circuit voltage and current, and pick the version and rating that covers both.
- Wire the filter inline on the power feed to the camera, video transmitter, or power amp.
- Wire a second filter in series for stronger filtering, or in parallel for more current, when one board is not enough.
- Power the build and check the video feed for lines before and after the filter.
Parts that fit this guide
Shipped fast and securely from our secure facility in New York, providing fast, high quality USA shipping.
DC Power Filter Board 0-25V/0-50V 2A/3A/4A EMI Suppression Module ($4.99)
DC power filter board from $4.99. An LC differential common-mode filter board in 0-25V and 0-50V versions at 2A, 3A, or 4A.
Switch Mode UBEC 3A BEC (2-6S LiPo) ($10.99)
Switch mode UBEC 3A BEC at $10.99. A regulated BEC for 2-6S LiPo packs, to power a receiver or video gear from a clean output.
Shop the full range: Power Distribution & BECs at Quality RC Parts. See also: Related guide.
Read the companion version of this guide on MTSUAV.
Frequently asked questions
Do I need a filter if my flight controller has a BEC?
A filtered BEC output is often enough. Add an external filter when the video feed still shows lines, or when the flight controller has no clean BEC rail.
Can I use the 0-25V version on 6S?
No. A 6S pack peaks at 25.2V, above the 0-25V range. Use the 0-50V version for 6S builds.
Does the filter replace a capacitor?
No. A low-ESR capacitor on the ESC power pads and an LC filter on the camera feed solve different parts of the noise problem, and builds often use both.
What happens if I exceed the current rating?
The filter cannot do its job above its rating. Pick the 2A, 3A, or 4A version that covers the load current, or wire boards in parallel for more current.
Sources
Last updated: November 11, 2026.