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H: How does a "coilgun" work? I was wondering how that so-called "coilgun" works, I know what it does but I was wondering how it works under-the-hood and eventually how to make a basic one ? Also, how much energy would be required ? AI: A coilgun is a series of coils that are successively energized as a conductive pro...
H: How to measure temperature using a NTC thermistor? I have a TTC103 NTC thermistor. It has zero-power resistance of 10 kΩ at 25°C and B25/50 value of 4050. How do I use it to measure temperature? AI: NTC (negative temperature coefficient) thermistors change their effective resistance over temperature. The most comm...
H: Shift 0-5V logic to ±2.5V logic What's the simplest way at low speeds (sub 100 Hz) to shift 0-5V to ±2.5V? I was thinking of using a comparator or op-amp, but there must be a simpler / cheaper way. I wanted to avoid a dedicated chip, unless it is cheaper than a discrete solution. Any ideas? AI: If you have -2.5V av...
H: Oscilloscope input circuit I am trying to design an oscilloscope/BNC input circuit for a side project and to learn more about filters. The requirements are: 150-200 MHz -3dB bandwidth 1 megohm impedance 50 ohm termination option (I can omit this if it causes problems.) Can be switched between 2x and 20x attenuatio...
H: Version control systems for hardware projects? What are some of the good versioning systems for hardware projects? Is there equivalents of Google Code, CVS and SVN? Are such version control systems suitable for hardware projects involving PCB files, schematics..(even firmware code)? AI: Basically, all VCS systems c...
H: PICs for beginners using MPLAB Compatible Mini USB PIC Programmer I wrote a program to turn on LEDs on PORTB. The programmer erased, programmed, verified, so far so good. But then nothing happened. No lights. My programmer is a MPLAB Compatible Mini USB PIC Programmer. What are some things that novices miss? Below ...
H: Need help deciphering markings on an electrolytic capacitor I have a capacitor which is marked with "1200uF200wv". What does the "w" mean? AI: The W is for Working; WV = Working Voltage
H: Do electrolytic capacitors have a limited shelf life? Do electrolytic capacitors have a limited shelf life? I would like to know for both aluminium and tantalum. AI: Aluminium Electrolytic Capacitors: Epcos: 2 years, cf. this applications information Cornell Dubilier: 3 years as per this document Nichicon: 2 years;...
H: How do I protect against an automotive load dump? A load dump occurs when the load to which a generator is delivering current is abruptly disconnected. In automotive electronics, this applies to disconnecting a battery while it is being charged by the alternator. It is apparently well-described in this $65 SAE docu...
H: Looking for an inexpensive Smoke Detection Sensor As the title says, I am looking for a smoke detection sensor. Took a look from SparkFun to Mouser and did not find anything. Is there a part you would recommend? I would prefer something that interfaces with the ATMEGA168/ATMEGA328 via a single wire or two wire inte...
H: Will PWM on 50% duty cycle cut the current in a DC motor in half I have a DC motor that is controlled by a PWM output on an Ardiono and I want to know if I can safely assume that by setting the output to 50% duty cycle, the current in the motor will be 50 % as well The output is connected to the base on an BC338 tr...
H: How to recharge a battery with a manual battery charger What are the best practices for recharging a 12V lead acid battery with a manual recharger. I have a 12V lead acid battery (7.2AH/20HR MK ES7-12 (PDF)). I've read the advice here on how to check the battery level (I have ~12.2 V under no stress, and when power...
H: Moving PIR sensor (or IR camera), aka Predator like alien scanner To avoid public transport and the car, I decided to go to work on foot everyday but I have to pass a small, but dark (in the evening) and scaring wood. Even if I use flashlights, I'd like to have a kind a "life scanner", like the one used by Predator...
H: I want to learn enough image and video processing to execute a project idea, pointers? First of all, I am a total newbie to image processing. I have a project idea, part of which will involve doing the following: I have a white board and a camera (a normal webcam by z-star). I will draw a shape on the white board. ...
H: Why do chips not always "meet the grade"? During manufacture, integrated circuits are tested at varying frequencies and temperatures to categorise them into speed grades. However, why don't all ICs come out the same and work the same? They all come from the same photolithographic mask, right? Am I missing something...
H: High voltage, high common mode current measurement. Any suggestions? I asked this question a few days ago, but I don't think I was clear enough, so I'm going to try again. Here is a rough diagram of my sputtering system: Basically, a DC voltage supply holds the substrate at a large negative voltage (~-1000V) relat...
H: What's the cheapest way to do basic EMI testing? I need to test that my project will not interfere with radios in the 27 - 72 MHz band. I can't afford a spectrum analyser. Nor can I afford to buy all tx/rx pairs in between 27 and 72 MHz (27, 35, 47, 72...) My budget is a maximum of £100. I was thinking of modifying...
H: Transmission line simulation (physical) I need to be able to simulate communications with a sensor device over a large length of wire (0-10km). This is for quite low-speed comms (10khz max, usually 1-2khz though). This would be FSK... but at some point I may have to handle a low baud RS232-like signal as well. Mos...
H: Recommendations for an active, directional RFID sensor I have been using two Loc8tor devices (an active, highly directional RFID consumer device) on a personal robot to try to locate an RFID tag. While the Loc8tor has served its purpose of showing an active, directional RFID sensor with high resolution can be used ...
H: Is it possible to send characters through serial to go up a line on the console window? I think it is possible due to how I can run vi straight from my serial port looking via TeraTerm. There, I can edit some text, go to the next line, then come back and edit the first line! How do they do this? What character over...
H: Is my butane soldering iron's tip dead? (pic) I've read the other posts on iron cleaning technique and I'm pretty sure I left it dirty often enough that it's toast, it seems the iron coating on the tip has flaked off completely; since I've got nothing to lose I'll attack it with a file in a second and see if I can ...
H: Can't get consistent readings from Sharp IR range detector I'm in the very early stages of trying to build a robot that wanders around and builds up a map of its environment. I'm using an Arduino and I currently have a Sharp 2Y0A21 IR range detector sat on top of a servo so it can take a 180 degree sweep in 10 deg...
H: What is 2-FSK modulation? In the documentation for a radio chip, I keep seeing the term 2-FSK, which seems to be a modulation scheme. My understanding is that in FSK, data is encoded by emitting a carrier wave on a number of different frequencies. Is this right? How does this differ to 2-FSK? AI: The number '2' ref...
H: Good resources for learning about my STK500 I have a Atmel STK500. And I can't get my head around what half of the board does. Does any one know of any good resources for learning about it. I have the following books: The primer book is good with the STK500 but only talks about the mega16(I think I maybe wrong o...
H: Use a current monitor IC or roll my own? I'm looking to measure current consumption of my microcontroller as an in-built feature of the final design. Should I buy and use high-side current monitors that are available on the market (e.g. Zetex ZXCT1009)? Or is it possible to build one out of discrete parts that's ch...
H: Where to put stabilising capacitor? Following on from this question. Can I place the capacitor anywhere in the circuit before the IR Distance Sensor? In my project I have 2 PCBs: A power circuit and a Processing Circuit. In the Diagram below you see the two PCBs Power Board and Processing as well as the Sharp dista...
H: Does anyone have code to emulate a 16-bit input shift register with an ATtiny2313? I would like to use an ATtiny2313 to emulate a Super Nintendo controller because I have an ATtiny2313 but I do not have an input shift register and I don't feel like soldering wires onto an existing SNES controller board. This applic...
H: Switching a Kettle On/Off using a arduino First of I have no experience with electronics so I am not sure what I should be searching for to get this done. All I have with me at the moment is a arduino and a few connectors and LED's. Is it possible to switch the kettle on/off using just these basics (i.e. I dont wa...
H: Plans / tutorial for sound effect generator using only analog components? I've been wanting to make a laser gun sound effect attachment for my son's bike. Currently, I'm using the electronics salvaged from his old laser gun toys. All of them seem to use electronics hidden under a black blob of resin or epoxy, whi...
H: Compare negative with positive, ignoring sign I need to compare a negative voltage with a positive one, each on the order of a few hundred millivolts each; I want to compare the magnitudes, ignoring the signs, although only for this particular quadrant (I don't need all other signs.) How can I do it? I thought of u...
H: Multi-channel bar graph LED drivers I want to build a circuit that shows the real-time frequency components of an audio signal on a number of bar graphs of some sort. Currently, my plan is to build 12 band-pass op-amp filters, and then use a rectifier and RC circuit to create a DC envelope for each output, and then...
H: ATtiny V-USB with 115200bps? DIP only I know there are several solutions for V-USB using only DIP Parts (especially the ATtiny) like IgorPlug http://obdev.at/products/vusb/easylogger.html http://cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20%28AVR%29_eng.htm http://www.recursion.jp/avrcdc/cdc-232.html But they are lim...
H: touch film replacing keyboard I am evaluating whether it can use "resistive touch film" in project-based cards using USBizi Chipset-100 in place of a conventional keyboard. I would like to see some similar design to see howto make interface. Any suggestions? AI: I'm assuming you want help with connections to the to...
H: What is the name of this common metal tubing? I see tubing used all over the place in machines, but I do not know what it is called. The cross section looks somewhat like this drawn picture. Can someone clue me in on it? AI: Structural aluminum extrusion: http://www.8020.net/ http://www.minitecframing.com/ (my favo...
H: Tips for identifying an unknown chip? What tools and techniques can I use to identify an unknown IC with no markings? Today I encountered a microcontroller under an epoxy blob. The blob had 11 pads on each of four sides, perhaps 44tqfp. From the board, I know which pin is the reset line and I probably know which pi...
H: Need circuit to close switch on detecting current (12V) I have a project where I need to detect whether a 12V circuit is live or not. If it is I want to close a switch (actually close a digital IO input on an Adicon SECU16 Digital IO controller). I am not an EE and would prefer to find a component off the shelf th...
H: How to implement a soft power switch controllable by microcontroller? I want to design a circuit such that the microcontroller can toggle a GPIO pin and shut the whole system (including microcontroller itself) down. And when the user presses a momentary button, the power is brought back up again. Is this possible? ...
H: PC Power supply for a PC/104. Current output I have to do some work on a PC/104 CPU board. Until now I have been powering this from a separate power module (acs-5151 at the same link) that took in 8-40V and gave +12, +5, and +3.3 out. Until now, I was able to power the CPU module with the 5V line but don't have acc...
H: Getting started with a microprocessor I'm reading about a microprocessors at the moment and wondering if I could get started with an 8-bit microprocessor. What would I need to get started. I understand that they need external RAM and ROM. I don't know whether it is still possible to get an Intel 8-bit one as my boo...
H: Could induction thaw ice? Last week we had very cold weather; and as a result there were lots of frosted pipes (iron and plastic). I spent a lot of time defrosting metal pipes with a torch, but could not do the same with plastic ones. Could a practical gadget be made to thaw the ice trapped inside metal/plastic pip...
H: Buying RF metal shields Where can I find those metal shield cans that you can solder directly on a pcb for EMI shielding? Just like the ones on the back of XBee modules? I'm not having any luck searching on farnell, perhaps with the wrong keywords, or maybe it's not a commonly bought item? AI: RS stocks these that ...
H: Fixing a broken Metcal handpiece I bought a Metcal STSS-PS2V-02 soldering iron from eBay, it was cheap and in need of repair. The previous owner had some problems with the handpiece and tried to fix it himself. I can't get it to heat up at all. If I turn the base station on without the handpiece connected, it draws...
H: How to apply process corners in HSPICE? How can I apply process corners (TT, SS, FF) to my simulation in HSPICE? AI: Use the .ALTER command, found in the HSPICE Command Reference.
H: Problem with PIC24F UART The problem I am having is with my PIC24FJ64GA002 and the UART module(s). The 24F I have is in a SPDIP28 package and it is a new B5 chip (just one under the latest B8 revision) from Microchip Direct. I have checked for errata issues which afflicted me last time with the I2C module. Anyway, ...
H: Beyond board power, understanding multiple power supplies and loads in a circuit I have a project I am looking to power where the secondary load is more than my Arduino can provide amp-wise. I need to know the simplest way to power the whole system. I will be powering the Arduino and a 5v 1.2amp load. Diagrams I ha...
H: Can Resistance of wires be ignored? I'm trying to calculate the internal resistance of my rechargeable batteries and haven't got a single battery holder so using I am having to using Banana plugs and Crocodile clips for holding my resistor. Then holding the banana clip on the negative end of my battery and reading...
H: Identifying Capacitors I bought a mixed bag of ceramic capacitors from Maplin and I'm struggling to identify most of them. I'm a bit of an electronics newb, but I understood that a capacitor usually has 3 numbers on and sometimes a letter at the end of the numbers. The third number indicates the amount of zeros yo...
H: What kind of components are black blobs on a PCB? In low-cost mass-produced items I often run into black blobs of what looks like resin applied directly on top of something on the PCB. What are these things exactly? I suspect this is some kind of custom IC that is layed out directly on the PCB to save on the plasti...
H: Tips for wire-to-pad and wire-to-wire soldering? After a simple flashy-LED kit's worth of practice, through-hole soldering is fairly straightforward. What I'm still having trouble with is wire-to-pad and wire-to-wire soldering. The first problem is keeing stuff still. Blu-tac helps but gets melty, and I've never us...
H: Simple Biasing Circuit I'd like to formally understand this simple biasing circuit: Let V+ be the supply voltage, Vi be the input voltage at the seemingly unconnected terminal of the capacitor, and let Vo be the output voltage at the junction between the resistors and capacitor. Let S be the impedance unit (i*omeg...
H: How do I implement accurate distance measuring (to ground) on a plane-like UAV for heights over 10m? How do I implement drone-to-ground distance-measuring for autopilot landings for heights over 10m? I found ultrasonic to be too inacurate, let alone GPS. Maximum height is 1000m, Vmax is 100 km/h, Vaverage is 72 km/...
H: Resources to learn about the AVR/RISC architecture I think I have used enough of the AVR series by atmel to say that I understand how to use it. I know somethings about how it actually works, but I would like to know more. Are there any good resources which describe the architecture of Atmega or RISC architecture i...
H: Why do battery/power supply supply voltages drop under a load? Why is it when you connect a battery to a heavy load does the voltage coming out of the supply drop? AI: Batteries have an internal resistance, this is generally measured in milli-ohms. As more current is drawn from the battery there will be a progres...
H: Voltage regulation and current limiting with a microcontroller I'd like to build a power supply for my desk. I've found a few projects based on the L200 adjustable voltage regulator. In the example below, how could I replace R3 with a microcontroller, so that varying the current limit can be automated? Likewise, h...
H: Why would a power supply mess with my scope? I recently bought a 0-35V 0-3A (105W) CC/CV linear power supply, made by Takasago in Japan, second hand. It's a nice unit, and inside of it is a massive power transformer along with three pass transistors on a very large heatsink (it is interesting why there are three tr...
H: How do I solder a Sparkfun breakout board to a shield? I need to solder some breakout boards onto an Arduino shield. What's the general procedure to do this? Do I solder it onto a header? Do I need any other mechanical connection or hold-down? For example, I would like solder this gyro sensor onto this aeroquad ...
H: magnetometers: do they work all over the globe? Are there any places on the globe where magnetometers won't work? For example, if you took a Honeywell HMC5843 to the North or South magnetic pole, would they fail to function properly? AI: You wouldn't be able to use it as a compass exactly at the magnetic pole, as t...
H: How do I calculate the current in parallel branches? I've been playing around with an Arduino for a while now, and while I know just enough about simple circuits to get little projects up and running, I still don't know enough to figure out what's going on in all but the simplest of circuits. I've read a few books...
H: Simple Electric Shock Device Can anyone tell me how to make a simple electric shocking device (like a electric pen or hand buzzer style). I've seen people use piezoelectric elements from lighters (is that correct?) but I would like to know how to create one from scratch, and also what current and voltage is needed ...
H: Pad dimensions and land patterns for QFPs I'm putting together a footprint for a 100-pin, 14x14mm TQFP, and I'm finding conflicting designs. The pitch and width of the pads are all basically the same, but the length and centering of the pads horizontally varies a good deal. The following images are from the Microc...
H: Short circuit protection for a boost converter Is it possible to add short circuit protection to a boost converter? My initial instinct was no, as the switch does not directly control the input to the inductor and this means the minimum output is Vin or so. But are there ways to protect such a converter? AI: Here's...
H: How many resistors do I need for an 8 switch DIP switch block? I was thinking of giving each switch it's own pull-up resistor, but this seems like it would be expensive and a little bit of overkill. But using just one pull-up for the entire block seems like it might overload the resistor (unless I just use a big on...
H: USB descriptor (LUFA) I'm trying to jump in the USB world with LUFA on a Teensy dev board, but I'm stuck in the understanding of the descriptors. Currently I'm trying to add one button to the joystick demo without sucess. Does anyone know some resource that explains step by step how to set up a USB descriptor? edti...
H: How do Force-Sensitive Resistors work? How does a Force-Sensitive Resistor work? Does it work by sensing the number of tracks the user covers meaning that the more force the user pushes on the sensor the less resistance it causes? Here is a picture of one: AI: A piece of flexible conductive material with a high res...
H: How to tell size of Eagle library component? I am working on my very first PCB design using Eagle. In my design, I will be using a 10W 10 Ohm power resistor. Since it isn't a "standard" size, I'm having trouble finding the component in Eagle. In particular, it has a width of 47mm. No component in rcl.lbr is long en...
H: Code Running from Debugger but Not Without it I am using WindRiver JTAG Debugger to debug my code. Whenever I run the code with Debugger connected, Code works correctly but If I disconnect it, It fails to even Start! Has anyone faced such kind of Problems? AI: My debugger for a Coldfire does some initialization of...
H: What is the advantage of a Z transform derived PID implemenation? I've seen many PID articles, such as this, use a Z transform of the generic PID equation to derive some crazy difference equation which can then be implemented in software (or in this case an FPGA). My question is, what is the advantage to such an i...
H: Is FCC certification required for something that is not sold? Is FCC certification required for something you put together for personal use or only for something you actually sell to someone else? AI: I believe that you aren't required to certify hobby electronics, but you still may get a knock at the door if your ...
H: What standard UART rates are there? I know 9600, 19200, 38400, 57600, 115200 and 1.8432 Mbaud, but no others. Why are these values used, and is it simply doubling each time or is there something more complex going on (for example, 38400 quadrupled is not 115200 baud?) The reason I ask this question is I'm designin...
H: How does a zener diode and a resistor regulate voltage? I'm having trouble understanding the simple voltage regulator that can be built using a zener diode (from section 2.04 in the Art of Electronics). I know that it would be better to use amplifiers, et cetera, but I'm just trying to understand how this circuit ...
H: What is equivalent to a daily build (and smoke test) for schematic designs? Daily build in software is taking the source code, compiling it and generating the executables, then running that nightly. This is considered a best practice since it catches errors that prevent the build sooner rather than later, which ma...
H: BJT transistor junctions: base-collector I've been playing with voltage swings in a basic emitter-follower circuit. If I swing the input too large in the negative cycle, the base-emitter junction is reverse-biased and the transister goes into cutoff mode. I can see the clipping in the output and this makes sense ...
H: Is there a standard or "safe" distance between PCB components? I am (still) designing my first PCB and, according to prices listed on websites, the smaller the board the cheaper it is. That is, batchpcb charges per square inch. goldphoenix will print "as many as they can" on an 100 square inch board. Smaller is che...
H: If I buy a spectrum analyser, how do I do an EMI test? Maybe when I have the cash to buy one, I will. But my question is more related to how to use one once I've got it. I assume I'll need some kind of antenna to receive the EMI. Are there general rules for self-testing? (Before sending it off for proper FCC/CE/etc...
H: Can I use an Arduino as a USB to serial interface? I have a BluRay player that can be programmed by accessing to a serial console, as described here. I have an Arduino (a Seeduino, actually), that has a USB interface. According to Arduino's documentation, pins 0 and 1 are RX and TX. Do these pins bypass from what t...
H: How to limit inrush current? I'm designing a device powered from USB. The device uses FTDI FT2232 chip for USB connection. Upon a command from a computer FT2232 chip should enable power via a MOSFET switch to rest of the circuit. This additional circuit has a capacitance of 50uF (FPGA + aux stuff) and is powered fr...
H: Is a loginway PIC-01 development board enough to program a PIC? I have a loginway PIC-01 Development board (it was sat in a cupboard for years). Does this board require additional adaptor hardware to blow a PIC (ICSP stuff etc), or can the on board serial port be used to do that? AI: Yes, it requires additional har...
H: Microcontrollers: Can I perform floating point operations in a Microblaze controller? I wonder if I could perform floating point operations in a Microblaze controller? Thank you to all posible answers with direct references to documentation or articles. AI: Floating-point operations are available, see this document...
H: Combining and Charging multiple Lithium Ion Battery Cells (3.6 V or 3.7 Volts) 1] Voltage: 3.6V or 3.7V Are all 18650 lithium ion battery cells 3.6 or 3.7 voltsor or are there different voltage Lithium Ion cells in the market as well? 2] Possible Voltage Shortage? Do all 3.6/3.7V li ions work the same standard way ...
H: Using a 4-pin computer fan controller without the load Is it OK if I use the controller from a CPU fan without connecting the motor's coils? All I want is to use the Hall effect sensor. The datasheet is posted here, the driving output circuit uses a darlington pair. AI: I don't see from datasheet how to use hall se...
H: Logic Level Converter, Arduino and Cellphone I am trying to interface a 6150 Nokia cellphone with an Arduino Duemilanove board, as some have already done through the FBUS protocol (see here for example). The FBUS protocol uses 2.8V logic, so I bought Sparkfun's logic level converter to interface with the 5V from th...
H: How to remove "glue block" from PCB? I have a mysterious component covered with yellow "glue" or something. It has very hard surface, but it seems its been poured into the plastic "cage". The shiny cover on the top is some kind of paper, I can rip it off. Any idea how to remove this goo from the PCB? (Without damag...
H: Impedance across AC circuit Problem: An impedance 1000(1 + i) Ohms (and note it contains an imaginary part) is connected across an AC voltage source of amplitude 10 V and frequency 60 Hz. What's the power dissipated during one cycle within the impedance? Relevant equations: P = Re(V*I), where V* is complex c...
H: What to consider when choosing batteries for a project? How do you choose what batteries to use for your projects? Are there a set of criteria that they need to be able to do in order for you to consider them? If so what are they?. The only 2 that come to mind are size and capacity. So do I need a PP3 or could I us...
H: What Ways to Calibrate a Multimeter? How can one calibrate a multimeter, like a UT61E or any other multimeter in the 50 ~200 $ pricemark, when one does NOT have an expensive FLUKE nor a friend who has a FLUKE) AI: Very generally and at the most basic, you need a precision voltage reference and resistors. Obtaining...
H: Transmitting NTSC over digital link I'm interested in capturing analog video in NTSC and transmitting it as efficiently as possible over a digital link, preferably while maintaining as much fidelity to the original signal as possible. My thought was that the video signal might be able to be sampled with a high-spee...
H: Can i use ATmega8L instead of ATmega8? I am recently doing a project on robotics.And am following (societyofrobots) 50$ robot tutorial for that purpose.But i can't find ATmega8 chip anywhere as they told but i did found atmega8L instead.Now,is it possible to replace atmega8 by atmega8L though it has low capacity th...
H: High torque servo/stepper setup This is a bit of a general question. I have a project I want to put together similar to the 'sentry gun' projects seen on youtube. I've gathered an SSC-32 servo controller and couple of small servos - i think they're around 76oz-in - and I made a little brace so they are attached at ...
H: MCU choice, 3 Mbps UART I am about to develop a portable device to be interfaced with a computer (so, consumer electronics). I only have experiences with Microchip and Texas Instruments and I would like to have some hint to choose the right MCU. Key requirements should be: low power (it's a portable device); 16 bi...
H: How to calculate necessary resistance to dim some LEDs? Here's some nice LED's packaged in strips which can be cut apart and used for projects. Voltage is up to 12 volts, and many people are using 3S 11.1 lipo cells to power them. Some people comment that they are too bright, or that different colors (e.g. red and...
H: Detect PWM Duty Cycle in Hardware How would I go about detecting at motor controller level, that my PWM signal coming from my microcontroller is at 50% duty cycle. I would like to design a dead band into my motor controller so that I only have a single PWM signal coming from my uC instead of PWM, CCW, CW signals t...
H: How to ground a floating ADC input I have an ADC input that may be connected to an external sensor (based on how the user configures it). If I leave the input floating, I get a wide range of ADC values. Is there a way to weakly ground this input to get a stable reading if nothing is connected? AI: Try using a pull...
H: Where would one find thermal heat sink cases? I am looking for a case that would work well as a heat sink. Thinking that something like a car amplifier case? Anyone know where one could find cases like this? Would be using it to house H-Bridges and fill it with thermal conductive epoxy to water proof it.... AI: On...
H: Bluetooth newbie I am building some amauter schemes with Atmel uC. And this time I want to implement bluetooth functionality in my device: I want to be able to connect to device from computer and set parameter/get some readings. 1) While writing communication software on PC side is trivial, I am puzzled on uC side...
H: What is the file extension of the file that is loaded in a Xilinx FPGA? I wonder what is the file extension that described the functionality of my design and is the file that is loaded in a Virtex 4 FPGA to get the behavior of my VHDL design. Thank you. AI: This file is commonly called a "bitstream". Xilinx devices...
H: Microcontrollers: Can I perform floating point operations in a Picoblaze controller? I wonder if I could perform floating point operations in a Picoblaze controller? Thank you to all posible answers with direct references to documentation or articles. AI: Unfortunately, I do not think that the Picoblaze has hardwar...
H: Inexpensive switching regulator with internal inductor & diode I'm trying to minimize part count and cost of my project. It needs to have a 6V power rail with about 1.5A peak current from a 12V input. I'm shying away from a linear regulator because of the power dissipation but I would like to keep cost and part c...
H: Selecting a platform for DSP I have experience with selecting low end PICs, but haven't had to select a controller for DSP before. Initially I thought about the dsPIC line, but the only reason for this because I am comfortable with the microchip line. So, what options do I have to select from? How can I decide what...
H: How do I model an LED with SPICE? What diode modifiers are used in practice to model LEDs with SPICE (Berkeley v.3f5)? These are available to me: # Name Parameter Units Default Example Area 1 IS Saturation current A 1e-14 1e-14 * 2 RS ...
H: Inductor vs a capacitor I'm a Trainee electrician and pc hardware enthusiast. I was just wondering why a mixture of inductors and capacitors are used on motherboards? Why not just use capacitor? I thought the inductor stores electrical charge but it uses magnetism. What's so special about storing it as magnetism? A...