Looking to build a wireless sensor network (low cost and low power coin cell...
Folks, I am looking at implementing a very low cost temperature sensor module (module cost less than 10$)I wish to install these low cost sensors to sample the temperature and humidity on a highway...
View ArticleWhich Capacitors are Best for Power Supply Decoupling
Sorry one more decoupling cap question. When I am selecting a cap and there exist ceramic, tantalum, and electrolytic caps all with the value I need. Which capacitor type is the better choice for...
View ArticleHow to balance parallel MOSFET's
I want to place several mosfets in parallel to handle more current, but am confused about the Gate resistors and something refered to as a "balance" resistor. From what I've read, this balance...
View ArticleAudio Transformers -- Need a technical Insight.
Hi Folks,I'm a Digital Design Engineer and would like to get some information from some of you guys. As i said i'm into Digital Domain so I know really less about analog and very less about audio...
View ArticleSplit core current transformers
Hi, all. I'm looking for split core current transformers at a reasonable price. This will be formonitoring circuits in my home. The Magnelab SCT-400 and SCT-750 series look good because they come in...
View ArticleHow can I make my own printed circuit boards?
Hi, I want to start making my own printed circuit boards to build some of the great projects I want from a popular tech magazine. I know it involves photo resist, a scanner, and some kind of transfer...
View ArticleLED - Resistor Circuit Design Question
I have several types/colors of LEDs, both 3mm and 5mm, that specify a range for Forward Voltage (such as 3.2-3.5V) and/or a range for Current (such as 20-25 mA). I'm using some of the free online LED...
View ArticleHow to use a voltage regulator with a 12v solar panel
I have a smaller solar panel used to "trickle charge" 12v auto batteries that I want to use to power car cell phone and gps chargers. I simply added a female cigarette lighet recepticle on the end of...
View ArticleWhen / where should I use capacitors?
I appologize if this is a pretty basic question, I'm a software engineer by trade and do electronics stuff for fun. I'm trying to figure out when, where, and more importantly why you would use caps a...
View ArticleCut power when voltage drops below a specified level for XBEE S6
Hey Everyone,I am currently working on a device that sends UDP packs from an accelerometer through the XBEE S6. I am using the Sparkfun XBee Explorer Regulated board, the Sparkfun Powerfun LiPo Charger...
View ArticlePlease help...
Can any one please help he how to compile a C program on the ARM processor ?? Thank you very much in advance, Regards,Timothy
View ArticleDeath Ray at Hotel
The Vdara Hotel & Spa, a glass structure, famously sprung a death ray that would reflkedct the suns rays and was hot enough to singe hair or melt plastic. Apparently, intense heat is created by the...
View ArticleWich features are these capacitors
Can anyone tell me what features are the capacitors on the picture, are they general purpose or polymer or another one cause i want to buy them but need to know wich ones i should choose. The picture i...
View ArticleWhich Capacitors are Best for Power Supply Decoupling
Sorry one more decoupling cap question. When I am selecting a cap and there exist ceramic, tantalum, and electrolytic caps all with the value I need. Which capacitor type is the better choice for...
View ArticleRemote controlled robot snow plow - DIY + Video
DigiKey uses CUI's VHK200W DC-DC converter to create a remote controlled robot snow plow, the snowbot. Snowbot uses motors pulled off an old electric wheelchair and deep-cycle marine batteries.
View ArticleIs it possible to build a home-made Tesla Coil?
If my understanding is correct, one needs to have a firm grasp of alternating current, inductors, capacitors, and the concept of resonant circuits and be able to use software (Tesla coil simulator) to...
View ArticleSo, is the idea of retrofit LED bulbs bogus, or is it realy the way to go?
I've heard a number of people say that retrofiting existing lighting fixtures with LED bulbs is not going to be satisfactory. Yet I see a lot on companies beginning to offer LED bulbs with bases that...
View ArticlePlease help...
Can any one please help he how to compile a C program on the ARM processor ?? Thank you very much in advance, Regards,Timothy
View ArticleCharging Devices with USB 3.0
So this just occured to me, usb 3.0 is faster than usb 2.0 right? So, aside from speed of transferring data will this also affect the speed at which devices charge over usb? You can have a fast charge...
View ArticleLED - Resistor Circuit Design Question
I have several types/colors of LEDs, both 3mm and 5mm, that specify a range for Forward Voltage (such as 3.2-3.5V) and/or a range for Current (such as 20-25 mA). I'm using some of the free online LED...
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