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 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 ArticleReceiving an XBee ZigBee Radio Digital Output
All, I see in the examples of how you can send text info from one Xbee ZB radio to another and that's really cool. But, I would like to send a simple ON/OFF signal using one of the digital output pins...
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 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 ArticleNeed help choosing a microcontroller
I am currently creating the electric circuit for a design team at my school, but I have never worked with micro controllers before. Can anyone recommend a cheap/simple microcontroller to mess around...
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 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 ArticleReceiving an XBee ZigBee Radio Digital Output
All, I see in the examples of how you can send text info from one Xbee ZB radio to another and that's really cool. But, I would like to send a simple ON/OFF signal using one of the digital output pins...
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 Articleoptical sensor switch (photoelectric?)
I am trying to build an optical sensor switch for a small toy motor, but I am not sure where or how to start. I would like to make a photoelectric switch, or some type of optical switch that will...
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 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 ArticlePowering a standard LED with 120 VAC
I want to power a LED with 120 VAC. I set up a circuit like the one in the attached file. I sized the resistor with ohm's law. I wanted 20 ma so that means a 6.8 K resistor with a minimum of 2.4...
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 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...
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