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Re: buoy displacement detection

 by UNTEngineer ¦  Thu Nov 21, 2013 11:23 am ¦  Forum: Projects ¦  Topic: buoy displacement detection ¦  Replies: 19 ¦  Views: 2905

A quick google search yields this:

That talks about all the techs used to figure out your altitude under water, as well as sea rising.

Also take a look at ... nd-sensor/

Re: Heated Tron Hoodie

 by UNTEngineer ¦  Tue Nov 12, 2013 7:09 am ¦  Forum: Projects ¦  Topic: Heated Tron Hoodie ¦  Replies: 8 ¦  Views: 945

Unless shes a student with a backpack, or a biker (or cyclist), theres not much space in a jacket to place a power back with the weight of a brick... While LiPos are great for a myriad of projects they dont have the power density you need. However, before you give up, go and take a look at super cap...

Heated Tron Hoodie

 by UNTEngineer ¦  Sun Nov 10, 2013 9:53 pm ¦  Forum: Projects ¦  Topic: Heated Tron Hoodie ¦  Replies: 8 ¦  Views: 945

Thankfully, you're not the first person to think of this. Take a look at this build. ... 32&page=12

And heres the heating wire they talk about:

Re: Heated Tron Hoodie

 by UNTEngineer ¦  Sun Nov 10, 2013 11:16 am ¦  Forum: Projects ¦  Topic: Heated Tron Hoodie ¦  Replies: 8 ¦  Views: 945

What Mee n Mac said....but it isnt likely that you can power a heater with a small LiPo, especially if you are trying to get a decent amount of warmth on a cold day. Think bigger: maybe a laptop battery would do the job....unless you split the work on many batteries to make for a less bulky power pa...

Re: Identifying small SMD parts

 by UNTEngineer ¦  Thu Oct 03, 2013 8:58 pm ¦  Forum: Projects ¦  Topic: Identifying small SMD parts ¦  Replies: 14 ¦  Views: 2619

qwertymodo wrote:Still working on the rest of the list... I have a feeling one of them may be a 1-to-2 decoder from TI's 74*1G* series.
Sorry I couldnt help anymore...Ive been so overloaded at work, I barely have time for the rest of my life. :(

Re: Identifying small SMD parts

 by UNTEngineer ¦  Tue Sep 24, 2013 9:02 pm ¦  Forum: Projects ¦  Topic: Identifying small SMD parts ¦  Replies: 14 ¦  Views: 2619

Digikey web order history + datasheets. Once I go through my Digikey history, I'll probably move on to sample order histories for some of the companies I've ordered from (TI being the main one). TI, at least, has the top markings listed in their datasheets, but I have to at least have a vague idea ...

Re: Identifying small SMD parts

 by UNTEngineer ¦  Tue Sep 24, 2013 5:35 am ¦  Forum: Projects ¦  Topic: Identifying small SMD parts ¦  Replies: 14 ¦  Views: 2619

qwertymodo wrote:Alright. Figured one of them out. CX4R is a TI SN74LVC1GX04 crystal oscillator driver.
Cool, how'd you figure that out?

Identifying small SMD parts

 by UNTEngineer ¦  Mon Sep 23, 2013 6:23 am ¦  Forum: Projects ¦  Topic: Identifying small SMD parts ¦  Replies: 14 ¦  Views: 2619

Well right off the bat, I can tell you most SOT 23-5 chips are power management devices...regulators, surge protectors, etc. First chip is a TI FR5969, ( It'll take some more digging to figure out each one. I'll keep you posted.

Re: Identifying small SMD parts

 by UNTEngineer ¦  Sun Sep 22, 2013 6:38 pm ¦  Forum: Projects ¦  Topic: Identifying small SMD parts ¦  Replies: 14 ¦  Views: 2619

Also, if you have a digital microscope, maybe we can make it a trivia game to ID all the parts with you! :)

Re: Identifying small SMD parts

 by UNTEngineer ¦  Sun Sep 22, 2013 6:36 pm ¦  Forum: Projects ¦  Topic: Identifying small SMD parts ¦  Replies: 14 ¦  Views: 2619

I use those little plastic lego-type cases from Adafruit that you can assemble together. The black ones are static dissipating, so theyre perfect for sensitive components. As for new parts, I usually keep them in the Mouser/Digikey bags they came in....Ive also got 0805 and 0402 resistor/capacitor b...

Re: Newbie needs help with reflow.

 by UNTEngineer ¦  Sat Sep 21, 2013 10:12 pm ¦  Forum: PCB Design Questions ¦  Topic: Newbie needs help with reflow. ¦  Replies: 24 ¦  Views: 5173

Sorry for the delayed response...

Thanks for the suggestions, I'll look into safe alternatives. Playing with AC power switching and ovens sounds way over my experience level....I will take your warnings to heart.

Re: Fuel flow sensor?

 by UNTEngineer ¦  Sat Sep 21, 2013 7:00 pm ¦  Forum: Projects ¦  Topic: Fuel flow sensor? ¦  Replies: 4 ¦  Views: 1435

Two things Id like to input: First, if you tamper with or add anything into the fuel line, make sure it is safe to do so and legal to do it! If you go and get an inspection with this gadget in there, they might (might!) fail you. Second is, I found plenty of cheap flow meters on ebay (http://r.ebay....

Re: Need a circuit board designer for small project

 by UNTEngineer ¦  Thu Sep 05, 2013 5:12 pm ¦  Forum: PCB Design Questions ¦  Topic: Need a circuit board designer for small project ¦  Replies: 16 ¦  Views: 3056

Yeah, I totally get you. I havent had the time to work on my personal I probably wouldnt have the time to work on something for someone projects always take priority, but thats not to say Im not enjoying them - which I am...I was simply stating that so I get to put some inp...

Re: RTC with Supercapacitor Recharge

 by UNTEngineer ¦  Thu Sep 05, 2013 12:46 pm ¦  Forum: SparkFun Product Questions ¦  Topic: RTC with Supercapacitor Recharge ¦  Replies: 40 ¦  Views: 10993

Then that pretty much eliminates using a USB hub for powering a device for more than a few hundred mA. Id use an external supply or have a built in power supply independent of the USB line.

Need a circuit board designer for small project

 by UNTEngineer ¦  Thu Sep 05, 2013 12:42 pm ¦  Forum: PCB Design Questions ¦  Topic: Need a circuit board designer for small project ¦  Replies: 16 ¦  Views: 3056

Thats a great breakdown, I never really knew thats what it took. So for something so simple, it can end up costing 2-4k for development of it. That doesnt even cover overhead costs... Cool.

I take back my "price gauging" statement. ;)

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