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About bob345

  • Title
    Systems Engineer
  • Birthday 1993-11-15

Profile Information

  • Gender
  • Location
    San Jose
  • Interests
  • Biography
    things that happened
  • Occupation
    systems engineer


  • CPU
    i5 4670k
  • Motherboard
    msi z87-gd65
  • RAM
    16gb Corsair vengeance pro 1600mhz
  • GPU
    EVGA 1070 superclocked
  • Case
    Fractal arc midi r2
  • Storage
    Samsung 840 120gb
  • PSU
    Seasonic x650 gold
  • Display(s)
    lg 21:9
  • Cooling
    Corsair H100i
  • Keyboard
    Corsair K70
  • Mouse
    Corsair M65

Recent Profile Visitors

11,484 profile views
  1. No, mainland Africa is not an island, neither is Australia by definition. Trying to bend and interpret definitions to further your argument really doesn't help your case. This is literally elementary school stuff here. Neither Africa, nor Australia are islands. Case closed.
  2. No real issue as long as the separate rails are the same voltage. Its pretty common practice it quite a few designs. You cant combine rails of different voltages however as the lower voltage rails will sink current from the higher voltage rails. I have built quite a few supplies not all that different than the one pictured above and its a pretty decent way of getting decent current at many voltages for not much money.
  3. You would be surprised how many companies use 3d printing for FAR more than just prototyping. Saying it is only good for prototyping is just plain wrong. In many cases 3d printing can be far superior in both strength and cost.
  4. so they "invented" a lenticular lens? Looks like you can sell anything to the military if you put quantum somewhere in the overview.
  5. Threw together a little headphone amplifier to try out osh parks new after dark option that gives you a 2 layer board with black fr4 and a clear soldermask. Looks pretty sweet if you ask me. Design is based on a tpa6120 so it should perform decently once i get the parts in. Might try my hand at a full amp/dac if it works out well.
  6. New oscilloscope. It's a Rhode & Schwarz rtb2004 with the fully loaded com-4 package. It's just amazing
  7. Wavelength is a function of propagation velocity, and frequency. All you need to do to get wavelength(λ) is divide the speed of the medium you want to calculate for which is the speed of light in this case, by frequency in HZ. An example in your case solving for the wavelength of 145mhz would be λ=299792458 m,s / 145000000 HZ where λ tuns out to be approximately 2 meters. That band is also commonly referred to as the "2 meter band" because of its wavelength. You don't actually need to have a full wavelength antenna though as divisions of the desired wavelengths are still resonant at 1/2 and 1/4 wavelengths. There are other tricks you can play to get even small antennas such, but i wont get into too much detail.
  8. I don't even know why they would be advertising that they use components using ethically sourced metals. Pretty much any pcb fab/ assembly house worth their salt will already have a conflict mineral policy. This kind of thing has already been widely adopted in industry so far. The only place this is currently an issue still is with bottom dollar grey market and counterfeit electronics. Its nothing like it was 20 years ago.
  9. The Focal's are definitely a good recommendation. I have a pair of the chorus 706's and frankly for the price im not sure there is much better. And they are amazingly good for near field listening.
  10. Realy depends on the car. Ive driven cars with great hydraulic and great electric steering racks as well as terrible versions of both. I do think modern electric steering racks are far Superior to hydraulic power steering though. Good electric racks give so much more feedback because of how fast they can react. A lot of people are surprised when they hear that new wrx's and brz's/86's all use electric power steering because they offer pretty amazing steering feel.
  11. Just put together my new chair. It's a dx racer iron series. WAY better than my previous chair which was pretty much on the verge of falling apart.
  12. Heres my current setup. Main speakers are some focal 706's which are pretty fantastic for either near field or normal setups. Amp( not shown) is a smsl sa-50 with a schitt valhalla 2 being used as a preamp/headphone amp as well as a schitt modi 3 DAC. Headphones I now use are senheiser hd6xx's
  13. I mean, TECHNICALLY you could pass a digital signal over a 3.5mm jack that carries 5.1 audio, but there is no standard i know of in existence that does that. If you are using headphones, you can approximate 5.1 surround sound, but you really never can get true 5.1 surround sound from only two speakers in a room. Its even there in the name. 5 being for 5 separate speakers (front left, front center, front right, rear left, and rear right) and .1 specifying a single sub-woofer.
  14. 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
  15. Picked up a set of new senheiser hd6xx's decent upgrade from the akg k240s I've been using.