Page 23 of 30 FirstFirst ... 131415161718192021222324252627282930 LastLast
Results 221 to 230 of 291

Thread: power supplies with minimal radio interferance?

  1. #221
    Newbie
    Join Date
    Apr 2012
    Posts
    44
    Yes, the box I'm hoping to use is fairly long so hope it's ok. Ideally I'd like to fit it inside my Travla case. I'll take the M4 down to Jaycar for a test fit prior to committing to it. I happen to also have two ATX cable looms from defect PSU's to use, so this part appears fairly straight forward.

    With regards to the caps, http://au.mouser.com/Search/ProductD...JaiSamRA%3d%3d are cheap as chips these days. Transport costs more than the caps so around 70 AUD in total, but they can't ship until Feb 1st at the earliest. I've contacted RS to see what they've got as my searches of their web site didn't show much of a selection, still waiting for their response.

    Am I right in concluding the caps can be fitted either way? They're not polarized?

    Btw, if anyone else in Australia are interested in these caps, bulk buying together will half the price. Send me a PM, or post here.


    JJ

    This is what I found on the RS site: http://australia.rs-online.com/web/p...lters/0126017/ They're only 100V DC, but 10A, so I'm assuming they will be sufficient. Price is 4x higher than mouser
    Last edited by johnjore; 12-13-2012 at 12:54 AM.

  2. #222
    Maximum Bitrate Mickz's Avatar
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    832
    The RS units are chassis mounted and current rating is not bad. The Mouser unit looks like they are not chassis mounted but are solder in, chassis mounted ones are $18,00 each. That's ok as the price is way less. With solder in and a diecast case you will need to drill a hole for each cap that is larger than cap, then cut a large piece of double sided copper PCB so that it covers all the openings with one piece. Drill the PCB for a snug fit when the cap is inserted and then solder each of them in (they have one solder flange). The PCB can then be screwed securely to the inside of the case which should then bond both sides of the PCB together.

    The install direction is not so much electrically important but the design of the cap results in the larger part of the cap having the strongest mounting point for the cable, this should be on the outside of the case.

    I could not see any current rating for the mouser caps and as they are small you may need to use 3 caps on the +5 rail and the +3v rail. Each of these rails has a number of wires in the loom so this should be easy but unfortunately costs a bit more for the extra caps of course.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  3. #223
    Newbie
    Join Date
    Apr 2012
    Posts
    44
    Mick,
    Thanks for the clarifications and information. Placed an order for 20x of the Mouser's. Should arrive mid Feb. I'll see if I can make it all work then.
    Needed one size larger box from Jaycar to fit the M4-ATX, plenty of room inside it now.

    Updated parts list with http://www.jaycar.com.au/productView.asp?ID=HP9515 as you've made a point of it being double sided. I'm assuming "screwed securely to the inside" = drill a couple of holes in the die cast box and bolt it?

    I'm also assuming each hole I make, makes the box "leak" interferrence?


    I'll probably also add a few of these http://australia.rs-online.com/web/p/products/483-8607/ (4/9 ways) to allow me to disconnect the PSU box from the rest of the car for maintenance purposes as I've yet to get a case for both the mainboard and the psu case.

    It all adds up, but this should hopefully take care of my interferance issue once and for all.



    JJ

  4. #224
    Maximum Bitrate Mickz's Avatar
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    832
    Looks good. Correct, double sided PCB is screwed to the inside.

    Actually, cutting a hole in the lid and mounting a fan in the lid so that the fan supply leads and motor are on the inside of the case lid does not cause any real RF leakage. You can also drill 4 or 5 1/4" holes on the side furthest from the Feed-throughs to exhaust warm air from the case. Radiation of RF is limited by the design of the board, it's RF coupling onto any and every lead that penetrates into the case that is the problem.

    The feed through caps bypass RF signals to the inside of the case and keep RF currents inside the case walls. The fan opening is far enough away at these frequencies to not allow RF to bleed/radiate over and back onto the PSU cables. That's why simple toroids and/or caps placed on the PSU leads have almost no effect, RF simply radiates around and away from these and continues on it's merry way. The feed-through caps with the case as a barrier to this localised RF coupling is what stops this from happening and keeps the leads relatively free from HF-RF.


    Best of luck and hope it works out for you.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  5. #225
    Newbie
    Join Date
    Apr 2012
    Posts
    44
    The Mauser part has finally arrived (Sorry, not the most in-focus image, but if one steps back from the computer a meter or two it gets better. The part is just under 1cm long and hollow inside):

    Name:  mauser2.png
Views: 148
Size:  198.4 KB


    Not 100% how this is supposed to work. Actually, I have no idea what I'm doing here. and google's not much help....


    Do you solder:
    a) on the inside of the "short" side, and the outside of the "long" side?
    b) and the PCB goes on the right side of the flange on the image?
    c) nothing "touches" the brown part except the PCB itself?


    JJ

  6. #226
    Maximum Bitrate Mickz's Avatar
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    832
    Really need a clear close up pix of both ends.

    Looking at the PDF it shows only one end tinned (for easy soldering). This looks kind of strange in the picture you took.

    These devices are a tube with the outer casing soldered to the case around the lip that passes through the case wall. The inner tube conductor is separated from the outer with a dielectric. This forms a capacitor that runs the length of the tube.

    It works by bypassing RF from the inner pass-through conductor to the case walls and keeps RF confined to the inner wall of the case therefore removing most of the RF from the lead.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  7. #227
    Newbie
    Join Date
    Apr 2012
    Posts
    44
    No macro lense on the camera, but hopefully these are better:

    Its about 9mm from one end to the other. The brown parts appear to be insulators.
    Name:  front.png
Views: 121
Size:  440.9 KBName:  rear.png
Views: 122
Size:  551.1 KBName:  image5.png
Views: 104
Size:  186.5 KBName:  image2.png
Views: 99
Size:  77.5 KBName:  image6.png
Views: 101
Size:  207.1 KBName:  image3.png
Views: 101
Size:  151.7 KBName:  image4.png
Views: 103
Size:  175.4 KB


    JJ
    Last edited by johnjore; 02-12-2013 at 04:33 AM. Reason: more pictures

  8. #228
    Maximum Bitrate Mickz's Avatar
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    832
    2404-014-X5U0-102P-8922.pdf


    Looking at this PDF I think you have to pass the wire through the device and solder to the small solder ring on the outer tip. Have not seen one like this before but I see no reason why it won't work. Be careful not to put any strain on the device when using heavy hard to bend PSU cables and don't use to much heat.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  9. #229
    Maximum Bitrate Mickz's Avatar
    Join Date
    Sep 2009
    Location
    Australia
    Posts
    832
    Just to clarify on installation.

    If you are using an aluminium case you would cut a square section out of the case. A piece of double sided copper PCB would later be placed over this cut out. You drill small holes in the copper PCB that are fractionally larger than the caps. The cap is inserted into the hole with the flange on one side (which will be the outside of the RF shielded case when the PCB is mounted). Solder the flange to the PCB and solder around the cap shaft on the other side of the PCB. This electrically connects both sides of the PCB together, repeat for each cap.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
    8" 16:9 TRANSFLECTIVE, Win8-64, Dual GPS RX and Garmin PC + Odyssey Nav, FM-DAB+, BB-Rec
    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

  10. #230
    Newbie
    Join Date
    Apr 2012
    Posts
    44
    Hi and post #229 is ok (I think), but post #228 puts both ends of the wires on the same side of the flange.
    Clarification: Not both the tips, but the main body of the wires are on the same side of the flange.

    Name:  image_wire.png
Views: 92
Size:  141.5 KB


    Little confused as to how that works as I thought the purpose was to have each end on different sides of the PCB?




    JJ
    Last edited by johnjore; 02-13-2013 at 03:18 AM.

Similar Threads

  1. HD Radio Commands
    By MGD in forum Road Runner
    Replies: 8
    Last Post: 07-23-2009, 03:01 PM
  2. Indexing music in 1.0.9.8 Failed
    By hovalistic in forum StreetDeck
    Replies: 0
    Last Post: 07-07-2007, 11:19 AM
  3. Joining 2 power supplies ??
    By vicky_obee in forum Power Supplies
    Replies: 9
    Last Post: 05-18-2006, 07:03 AM
  4. del
    By hanzacra in forum Classified Archive
    Replies: 1
    Last Post: 08-07-2005, 10:32 PM
  5. Opus power supplies ---> for AMD mobile???
    By folagana in forum Power Supplies
    Replies: 17
    Last Post: 09-08-2004, 07:39 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •