Jump to content

bob345

Member
 View Profile  See their activity

  • Posts

    3,818

  • Joined

  • Last visited

 Content Type 

Everything posted by bob345

  1. bob345
    Nice looking layout! One thing i would recommend though is leaving solder mask over via's that get close to pads as they can cause issues with assembly. Via's in pad like in D3 can cause manufacturing issues as well as it can wick away the solder paste. Not much of an issue for manual assembly, but definitely can cause a headache during volume manufacturing
  2. bob345
    Picked up a set of new senheiser hd6xx's decent upgrade from the akg k240s I've been using.
  3. bob345
    Got a new (to me) Schiit Valhalla 2 to use as a preamp and headphone amp
  4. bob345
    I was initially thinking this could be de-lamination, but it looks like the discoloration is localized to the copper. Could be staining from the copper not being cleaned/handled properly at the fab house. This would definitely be rejected by most companies.
  5. bob345
    New desk riser. About 10 inches wider than my previous one so it really helps with desk realestate. also, WTF AMAZON. This the box they ship it in vs the size of the box inside. Wasteful much?
  6. bob345
    Not possible with just soldering on connections. usb-c by far the most complicated usb standard out there and it can involve quite a bit of work even so get something like quick charge working right. A good example would be the raspberry pi 4 that pretty much botched their usb-c implementation.
  7. bob345
    Just going to leave this here. Hope a reconnaissance aircraft counts as real data to the OP, because if this doesn't settle it then well, i don think anything will. Flight level and surface wind speed of close to 150 knots at the eye wall.
  8. bob345
    Picked up some Focal 706's and a Schiit modi3
  9. bob345
    The connectors used are 2.92mm connectors. A bit over kill for this, but i have a bunch of them and they are solder less so why not. the L's and C's you see are really only there as bias tees as this mixer has a built in LO amplifier and if amplifier. Nothing too crazy going on, just breaking out the chip really. And yes, the board is quite small. here are a few images. Mixer is in a 4x4mm qfn and the small passives are 0402'. Mixer is good for 2-7.5ghz
  10. bob345
    Like the title says, I think it would be nice to see some printed circuit board projects others may be working on that they are willing to share as there seem to be a good amount of people here that are really into electrical engineering. Anything from hand soldered perf-board projects to full blown PCB assemblies would be great to see here! Here's a small test board i recently put together for a larger project. This board is for verification of a mixer that will likely be used in a wide band down converter for one of the stages. Being well into microwave territory, every detail of the pcb and layout can effect performance which is why microwave board layouts tend to look so different than conventional layout. Layout was done using kicad 5.0 and simulated with a combination of QUCS and Sonnet
  11. bob345
    get yourself some nylon standoffs, a 1u or whatever size rack, and a drill. You wont find what you want pre-made.
  12. bob345
    Unless you have the data sheet and are familiar with LVDS interfaces you are very unlikely to get any real use out of them. It is next to impossible to figure out proper pinouts without any information from the manufacture.
  13. bob345
    Kicad is probably the best free option out there and it is what I would recommend. Osh park is also great for getting pcb's manufactured fairly cheaply.
  14. bob345
    Big piece under the engine is a splash guard and the one on the left is a fender liner. And on an e46 i would just ditch the splash guard. I used to have one and even a new one still drooped down and looked horrible
  15. bob345
    your eyes would have to focus on the inside of your glasses and what is in front of you at the same time which is not possible. If it where that easy smart glasses would be everywhere.
  16. bob345
    Space x starlink satellites. The launched 60 of them and They are still spreading out. What you saw was the sun reflecting off of them https://www.google.com/url?sa=i&source=web&cd=&ved=0ahUKEwj-gc7luLfiAhVFwMQHHb7oBX8QzPwBCAI&url=https%3A%2F%2Fwww.space.com%2Fspacex-starlink-satellites-spotted-night-sky-video.html&psig=AOvVaw2kbvI8_W1HZyh6NmP_Znyd&ust=1558899896141501
  17. bob345
    Finally got my OnePlus 7 pro
  18. bob345
    easy 10/10. Really between the lighing and the action in the shot its prety much perfect imo. here's a shot i took a while back at a cars and coffee with a Mamiya 645 and some kodak tri-x 400
  19. bob345
    Cant wait until this arrives
  20. bob345
    Honestly it's the most fun car I've ever owned.
  21. bob345
    Some pics from autox this past weekend. Photographer did a pretty great job IMO
  22. bob345
    Voltage regulator is dead guaranteed. You need an external dc-dc converter as the built in regulators over heat even if you are just a bit over 5V.
  23. bob345
    Got the re -71r's mounted and balanced. Perfect fit for these wheels.
  24. bob345
    Picked up some new re-71r's for Auto x. Pretty crazy tire at 265
  25. bob345
    Definitely looks like an smd fuse. Given the surrounding circuitry id definitely say that is what it is. value could be anything though and i would not just bypass it because fuses blow for a reason. are you re working the board? it looks like you have removed some other components as well.
×