A DC power filter board cuts ripple and interference on DC lines with LC filtering. The board comes in 0-25V and 0-50V versions, in 2A, 3A, and 4A ratings, from $4.99. A 4S pack peaks at 16.8V and fits the 0-25V version, while a 6S pack peaks at 25.2V and needs the 0-50V version.
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What does a DC power filter do?
The board filters ripple and interference from DC power lines.
It uses LC differential common-mode filtering, rated for 2A to 4A loads.
In an FPV build, the camera and video transmitter feeds carry less switching noise.
Which voltage version fits your pack?
Pick the version that covers the pack peak voltage, not the nominal voltage.
A 4S LiPo peaks at 16.8V, which fits the 0-25V version.
A 6S LiPo peaks at 25.2V, so it needs the 0-50V version.
Which current rating do you need?
Pick the rating that covers the load: 2A, 3A, or 4A.
Prices run from $4.99 to $5.99 across the 6 versions.
Wire boards in series for stronger filtering, or in parallel for more current.
What about the UBEC option?
The switch mode UBEC gives a regulated 3A BEC output from 2 to 6S LiPo.
Power the camera and video transmitter from a regulated BEC output when the flight controller offers one.
The UBEC costs $10.99, and the filter board starts at $4.99.
What did we check on the bench?
We matched the 0-25V and 0-50V versions and the 2A to 4A ratings to the listing.
We matched the 3A rating and 2 to 6S range to the UBEC listing.
We counted 1 image on each of the two listings.
Quick comparison
| Part | Voltage | Current | Price |
|---|---|---|---|
| Filter board | 0-25V or 0-50V | 2A, 3A, or 4A | from $4.99 |
| Switch mode UBEC | 2-6S input | 3A | $10.99 |
Steps
- Check the pack peak voltage: 16.8V for 4S, 25.2V for 6S.
- Pick the 0-25V version for 4S, or the 0-50V version for 6S.
- Pick the 2A, 3A, or 4A rating that covers the load.
- Wire the board in series on the camera and video transmitter feed.
- Power the build and check the video feed is clean.
Frequently asked questions
Which version fits a 4S pack?
The 0-25V version. A 4S pack peaks at 16.8V, which fits inside the 0-25V range.
Series or parallel: which wiring is right?
Wire boards in series for stronger filtering. Wire them in parallel for more current.
Do I still need a capacitor on the ESC pads?
They solve different parts of the noise problem. A low-ESR capacitor sits on the ESC power pads, and the LC filter sits on the camera feed.
Filter board or UBEC: which one do I need?
The filter board cleans an unregulated feed. The UBEC gives a regulated 3A output from a 2 to 6S pack.
Parts used
DC Power Filter Board 0-25V/0-50V 2A/3A/4A EMI Suppression Module, $4.99
Switch Mode UBEC 3A BEC (2-6S LiPo), $10.99
Related buying guides on Quality RC Parts
DC Power Filter Board: Clean Power for FPV Video Feeds
Micro FPV Frames: 1.6 Inch to 2.5 Inch Builds Guide
How to Wire a 5V Active Buzzer on an FPV Racing Drone
JST-XH Balance Leads: How to Balance-Charge LiPo Safely
Browse all the guides on the Quality RC Parts Drone Guides hub, or start at the Quality RC Parts store.
Sources
Quality RC Parts stocks parts in New York, USA and ships in-stock orders in 1-2 business days.
Last updated: 2026-11-11.