Wavess 0 Posted November 11, 2009 Report Share Posted November 11, 2009 Hi all, this have been discussed many times here, but I still haven´t found the best way to solve it accurate. I have on my Mikrokopter this Ubec http://www.unitedhobbies.com/hobbycity/store/uh_viewItem.asp?idProduct=4319 for powering servos on tilt, shutter and so on. And have another dedicated 5v linear reg for powerering the fpv gear: 1 Airwave 40mW 2.4ghz Tx 1 DPC-171 ccd cam If I run the power from the main battery I see those horizontal lines on the video. If I run the fpv gear with a dedicated battery the video is clear. I have tried to do a LC filtering with caps and an 330uH resistor´s style inductor in series with the +5V line. This reduced a bit the noise but not all. Then I tried with a 470uH power inductor this one http://es.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=233-5279 The result with this one is worst than with the 330uH resistor´s style Looking at the Switching frequency of the Ubec it tells 300khz. I assume that I have to go to a higger value on uH to match that resonant frequency but how much? BTW I´m placing this LC circuitry close to the video TX basically because the room on the Mikrokopter is not much to put it where I want. How to determine the best value for the inductor to have a clean video with a single battery? Quote Link to post Share on other sites
Mr.RC-Cam 129 Posted November 11, 2009 Report Share Posted November 11, 2009 Something is just not right. How about posting a wiring diagram that shows your video system's electrical layout? Quote Link to post Share on other sites
Wavess 0 Posted November 11, 2009 Author Report Share Posted November 11, 2009 Something is just not right. How about posting a wiring diagram that shows your video system's electrical layout? ok I will ASAP Quote Link to post Share on other sites
Wavess 0 Posted November 12, 2009 Author Report Share Posted November 12, 2009 (edited) here we go uploading directly through the forum didn´t work (got server error message)here is an external host Edited November 12, 2009 by Wavess Quote Link to post Share on other sites
Terry 5 Posted November 12, 2009 Report Share Posted November 12, 2009 Are you talking about interference from the UBEC or the motors? Terry Quote Link to post Share on other sites
Wavess 0 Posted November 12, 2009 Author Report Share Posted November 12, 2009 Are you talking about interference from the UBEC or the motors? Terry When I power up the video motors off I see some kind of lines across the screen, they go worst while motors on. So I assume both are putting noise out. Quote Link to post Share on other sites
Mr.RC-Cam 129 Posted November 12, 2009 Report Share Posted November 12, 2009 (edited) I can see the wheels turning in Terry's head. Let's just shotgun this. Do this: The two new inductors must have a low DCR rating and be able to handle >300mA current. The RS #233-5279 you selected should be fine. The diode must be 1A or greater rated Schottky type (1N5819 is common). If this does not fix it then there is something you are not telling us! uploading directly through the forum didn´t work (got server error message) Looks like the new software upgrade has problems with attaching jpg and gif files. I'll get that fixed. EDIT: FIXED FILE UPLOAD ISSUE Edited November 12, 2009 by Mr.RC-Cam FIXED FILE UPLOADER Quote Link to post Share on other sites
Wavess 0 Posted November 12, 2009 Author Report Share Posted November 12, 2009 I can see the wheels turning in Terry's head. Let's just shotgun this. Do this: The two new inductors must have a low DCR rating and be able to handle >300mA current. The RS #233-5279 you selected should be fine. The diode must be 1A or greater rated Schottky type (1N5819 is common). If this does not fix it then there is something you are not telling us! Looks like the new software upgrade has problems with attaching jpg and gif files. I'll get that fixed. EDIT: FIXED FILE UPLOAD ISSUE Ok great thanks for the schematic, would try that as soon as I get a proper diode to install. Quote Link to post Share on other sites
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