A cure for video interference from driver

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Trackerman
Posts: 138
Joined: 30 Oct 2017, 19:22
Location: ireland

A cure for video interference from driver

Post by Trackerman » 10 Feb 2018, 16:57

Folks,
Not sure if anyone has posted this before...
But it might be helpful to some DIY builders.

I decided to use a single battery supply to drive my camera/LCD and the IR source.
This is because my Foxeer NightWolf camera displays the battery voltage, so its nice to know the voltage level of ALL my batteries and not just the one on the LCD/Camera.

But of course there was interference on the LCD display caused by noisy voltage from the IR LED Driver.

There is a cheap and handy cure, simply place an LC filter between the IR and the battery, this totally eliminates all interference.

https://www.ebay.co.uk/itm/RTF-Power-LC ... SwYmZXIcs9

I did this and it's perfect, I now know the voltage of all my cells.
(I'm using 8.2v to drive the IR and the Camera since my IR can take it)

Cheers
Tracker

phoenix
BRUCE ALMIGHTY
Posts: 4847
Joined: 09 May 2012, 14:40
Location: Aberdeen

Re: A cure for video interference from driver

Post by phoenix » 10 Feb 2018, 20:17

Good find!
That's a lot smaller, neater and cheaper than the differential inductors I've been using.

Cheers

Bruce
LAND ROVER - THE WORLD'S WORST 4X4 BY FAR

Trackerman
Posts: 138
Joined: 30 Oct 2017, 19:22
Location: ireland

Re: A cure for video interference from driver

Post by Trackerman » 10 Feb 2018, 23:36

If it's small your after Bruce then try this

https://rover.ebay.com/rover/0/0/0?mpre ... 2268648523

Really small and should do the job nicely.

lightmesser
Posts: 554
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: A cure for video interference from driver

Post by lightmesser » 13 Feb 2018, 13:12

That is nice find but I am not sure if it would help in mine case.

My near eye is powered by single 18650 with 5V step up dc-dc. New mini display works with 5V so I just thought to power camera and display with that setup and yes it works but not without issuess...

I have slight problem with new mini display where in top left corner i have some "twitching" from time to time. It is kinda annoying. I thought it is Wolf camera issue but it is not since I added Eagle and same thing happens. So something interfere with new mini display and I don't know what. I use this step up: https://www.ebay.com/itm/DC-DC-3V-3-7V- ... 2749.l2649

phoenix
BRUCE ALMIGHTY
Posts: 4847
Joined: 09 May 2012, 14:40
Location: Aberdeen

Re: A cure for video interference from driver

Post by phoenix » 13 Feb 2018, 14:38

Put the filter in between the output of the 5V step up and your camera and display.
If you really want to eliminate interference, then fit a filter in the 5V power line going into the camera and another one in the 5V power line going into the display. However, it's just possible that the 5V step up may not "like" 2 inductors and capacitors connected to it's output

Cheers

Bruce
LAND ROVER - THE WORLD'S WORST 4X4 BY FAR

lightmesser
Posts: 554
Joined: 09 Jan 2014, 01:19
Location: Eastern Europe

Re: A cure for video interference from driver

Post by lightmesser » 13 Feb 2018, 15:22

phoenix wrote:Put the filter in between the output of the 5V step up and your camera and display.
If you really want to eliminate interference, then fit a filter in the 5V power line going into the camera and another one in the 5V power line going into the display. However, it's just possible that the 5V step up may not "like" 2 inductors and capacitors connected to it's output

Cheers

Bruce
Thanks Bruce.

I think it is worth a try but for mine setup 2x of this https://www.ebay.co.uk/itm/RTF-Power-LC ... SwYmZXIcs9 would take lot of space

This one would be more suitable: https://www.ebay.co.uk/itm/352268648523?ul_noapp=true but price also follows small tech stuff accordingly.

I can live with that for now(prototype phase, I consider replacing 18650 to 1S 2000 mah drone battery and if it will behave same than there is no doubt screen interference is caused by step up 5v adapter).


Edit: I found micro tech filter a lot cheaper here(bubble gum price :) ) : https://www.aliexpress.com/item/JMT-L-C ... 00433.html

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