Datasets:
Alignment-Lab-AI
/
StackStore

Dataset card Data Studio Files
xet
 Community
1
text
stringlengths
83
79.5k
H: Component with an impedance that has a negative real part Is there an electrical component such that its impedance has a negative real part ? Fact: Any electrical component made from resistors, inductances, capacitors (connected in possibly complex ways using series or parallel connections recursively) must have an...
H: How are air-core inductors typically constructed? I'm considering learning to build air-core inductors for power applications. For example, I presently want a .5-1 mH choke capable of handling 50 amps for two seconds. Winding my own air-core seems like it might be a cost-effective solution, but I'm not clear on ho...
H: Is the registry file made from SRAM? I study computer engineering and I read Hennessy's book about Computer Organization where it's described how the microprocessor does pipelining and that the microproceossor has on-chip cache, as much as 8 MB on-chip cache in a modern microprocessor such as AMD's Opteron. Is that...
H: Arduino Uno starter's kit and project Recently i bough an Arduino Uno, along with a breadboard starters kit (those two were bough separate) and i am trying to configure my first project. Looking to the breadboard instructions, if i am not mistaken, i am supposed to remove the ATmega328 from the Arduino and use the ...
H: What is a baudrate and what is an Xtal Frequency? I'm programming my LPC1313 MCU with Flashmagic on my mac and I am asked to put in the baudrate along with the Xtal frequency. I'm not sure what those are and when I looked in the data sheet I found no information about it. What do those terms mean in terms of a micr...
H: Calculate minimum voltage to turn off/on solid state relay I have an AQZ204 AC/DC type solid state relay AQZA204 datasheet Basically I want to calculate the minimum supply voltage required to turn the relay on and the minimum supply voltage required to turn the relay off. These are similar to Pick/Drop voltages of ...
H: Question about laser driver If you go to this link you see a nice laser driver for a small laser...didn't he mean to put that diode in series with the + and - or is it supposed to be parallel and I"m just not understanding for some reason? http://www.rog8811.com/LM317%20components01.jpg?0.35312663627278806 also hi...
H: Difference between data retention in flash and in EEPROM In a security recommendation (Mobile Operating System Protection Profile, §4.2.1 FCS_CKM_EXT.4.1), the following instructions are given to securely wipe a cryptographic key from memory: For non-volatile EEPROM, the zeroization shall be executed by a single ...
H: What is the unit for resonant frequency? What is the unit for resonant frequency? where \$\omega_0 = \frac{1}{\sqrt{LC}}\$? Is it just \$HF^{-1}\$? AI: In the simplest way possible: L is in henries (H) - \$\Omega \cdot s\$. C is in farads (F) - \$\dfrac{s}{\Omega}\$ Multiply both and you have \$s^2\$. Take the squa...
H: Parameterized Instantiations and Module Instantiations Is instantiations used above are very much similar to instantiation used in C++?I am new to verilog, yet in the stage of learning it.Like we used a instance of class in C++ at various places, so is it similar to using parametric and module instantiation? like ...
H: Soldering IC directly to stripboard I picked up my first "from-scratch" DIY electronics project in a long time, building a 2-tone door bell on stripboard with a basic 555 circuit. For the most part everything went well. I assembled the circuit and measured up before going out and getting a snug fitting plastic encl...
H: Interrupt being called before complete execution of ISR What happens when an interrupt is called again before the execution of the ISR is completed? AI: In most normal cases this either can't happen or there is no harm. Every architecture I can think of disables interrupts in such a way the the interrupt that was ...
H: GNU Radio with USRP I have a problem transmitting a voice file from GNU radio to USRP. My problem is the simulation was working fine but when I transmit data from GNU radio attached with USRP to its receiver only noise is heard. Could anyone shed light upon it? AI: The guys over at the GNURadio mailing list are a g...
H: MOSFET is not turning off when the gate terminal is grounded This figure shows a small portion of my circuit: The maximum Vgs of the MOSFET is 20V. The MOSFET is initially turned on and now I want to turn it off. For that I am grounding the terminal A to ground through a resistor of 1k. But it is not turning off. ...
H: Differences between OLED, LED, LCD, and TFT Screens I have heard about these different types of screens on DIY websites and in consumer electronics. What are the differences in these types of screens and what are their advantages and disadvantages? AI: LCD: liquid crystal display. Works by adjusting the amount of l...
H: How can electromagnetic interference from a USB charger cause a capacitive touchscreen to malfunction? Electromagnetic interference from a USB charger can cause a touchscreen on a mobile device to malfunction, with symptoms such as reduced sensitivity or spurious touches. As an example, see http://forum.xda-develop...
H: Help identifying component on Sainsmart 4-Channel Relay board http://www.thesunrain.com/Amazon/4%20relay%20board/4-ch%20relay%20module.pdf In the Schematic there are 4 Items Labeled U1,U3,U5,U7 They look like small black boxes on the actual boards. I can't really tell what they are, it looks like some sort of LED i...
H: Multiplex 125kHz RFID antenna I'm looking to follow up on a question (asked by another) that wasn't answered to my satisfaction in another question. RFID Antenna Array I am successfully using the ID Innovations ID-2 chip to read 125kHz RFID tags. Furthermore, I have sucessfully tested connecting antennas with RG-58...
H: MOSFET: Why the drain and source are different? Why the drain the source terminal of the MOSFET function differently while their physical structure is similar/symmetrical ? This is a MOSFET: You can see that the drain and source are similar. So why do I need to connect one of them to VCC and the other to GND ? AI:...
H: ZPUino soft processor I was going through http://papilio.cc/index.php?n=Papilio.Hardware and realized that they mention ZPUino Soft Processor but I am unsure of what this is exactly. I know that it is an soc according to http://www.alvie.com/zpuino/downloads/zpuino-1.0.pdf but what exactly is its role on the fpga-...
H: Can we place silkscreen inside the footprint? Can we place silkscreen inside the footprint for through hole PCB? I guess it eliminates "visual congestion". What are the problems associated with it?? AI: You can put silkscreen markings anywhere you want on a board. There is nothing special about being "inside" a fo...
H: What happens at the end of a transmission line? Let's say I wanted to make a widget containing a relay to switch between two antennas. There is a coax transmission line coming in from the transmitter, and two going out, each to a separate antenna. Inside is a relay which switches the center conductor, and the shiel...
H: Books/tutorials on programming a microcontroller I'm relatively new to programming with Microcontrollers. I bought an LPC1313 MCU and an FTDI RS232 cable from newark. I later found out that I would need to construct a PCB with 6 pin headers inorder to make the MCU interface properly with the cable. I have no idea h...
H: How to multiplex a two-way data line? I have a use-case where I need to control 4+ sonar sensors with a pic 628A microcontroller. The pic is also responsible for controlling a GPS and LCD so pins are scarce. The sonar sensors each have a single signal pin. To operate them, you pulse this pin which produces an ultra...
H: Using an Opto-Isolator to detect 120VAC on a Microcontroller I am designing a system where I need to know whether or not 120VAC is present on a specific wire. The system is in line with a fuel pump system, and I need to check to see whether or not the pump is getting power, if not, make an alert that the Emergency ...
H: How do I choose which version of the IC MT8870 should I use? I am following this guide to hooking up a phone to a circuit, depending on the DTMF tones. However, when I went to buy one, I realized there were lots of different "editions"/models. Which one should I choose? Does it really matter in my case? To make thi...
H: Generating a 10 volt rail from a High Voltage Supply with unknown Ground Potential I have a sticky situation where my power supply is coming from a charged capacitor with 200 volts across it. Because of the way it was charged, I can't guarantee that the negative side of the cap is at "ground" potential. All I can ...
H: Voltage translation with resistor and LDO explanation Could someone explain the voltage translation "Magic" that is happening in the circuit in the link below? Voltage Translation Magic! The YRPBRL78G13( blue on the left ) is a 5V design and the cc3000 module is a 3.3V design. I can't understand how the arrangement...
H: electric chewing gum prank circuit diagram I'm new to electronics. I'm trying to find out how this works out of curiosity. http://www.amazon.com/gp/aw/d/B0050UNNQS Does anyone have a circuit diagram for the circuit? Is the current safe for such a prank? Internal picture: EDIT: Merged question from Trever Thompson...
H: Passive integrator circuit in PSpice I'm trying to draw a plot of a passive integrator circuit. I think it's not correct as it should look like this: but mine looks like this (it's Vout/Vin on the right): I also don't know what voltage source should I choose (Vac/Vsin/Vpulse?) - I used pulse (as I saw it in a tu...
H: Analogue and Digital Voltage Rail What's the difference between an Analogue and Digital Voltage Rail? Why their grounds have to be different? AI: There is no reason their grounds must be different. However, it is often the case that they are, to reduce noise. Digital circuits, by nature, draw current in surges, ea...
H: Eagle Cad - redefining terminals of a component I use default BC337 transistor from the eagle-cad's library, terminals are: 1- Emitter, 2 Base, 3 Collector. however, datasheet of the BC337 that I am using defines the terminals differently 1 collector; 2 base; 3 emitter. how is it possible to redefine the terminals ...
H: Basic question about diode voltage drop and resistor position I'm new here and also new to electrical engineering so no fancy stuff yet, still tinkering with basic components such as resistor, led, caps and batteries. I think I caught up with the bad side of conventional + and - so I'd like to impose a few question...
H: Question about sign I need to answer this question using PSpice: It seems it's -15mA, BUT in the exercise, the current source is < (I understand it's + < -) in Pspice I set it to < as well, but there is - < + in the schema. Is it 15mA or -15mA? AI: If the question is "what current thru L?" then the answer is cle...
H: How to trade off connection styes in mixed gnd systems( power gnd and signal gnd)? I am using a motor driver L6235 from ST:application note.On page 6, it gives me a layout suggestion: it says that the SIGNAL GND and POWER GND should be connected in a single point: the negative part of C6. I think the reason is tha...
H: What are the things to notice before actually connecting a PWM motor circuit? I have simulated a PWM motor control circuit in Proteus, now I want to bring it to life and connect a circuit in real world. Here's my PWM circuit in Proteus: And the code: unsigned int duty_50; void main(){ ADPCFG = 0xFFFF;// ini...
H: Completing a circuit, how is the necessary voltage determined? When you have some device, like a TV, why is there a necessary Voltage-or current for that matter. Whenever I see circuits, it always says to find the current from the voltage and resistance given, so presumably with any battery there should be a curren...
H: Importing Drawings ( DXF ) in Altium I'm having trouble importing DXF / DWG into Altium. I followed the procedure outlined in the Altium wiki File-->Import (selected my dxf) and nothing shows up on my mechanical layer. I've tried multiple DXF files that I have used in the past. I'm using Altium Version 13.3.4 (...
H: Preference of NAND & NOR gates What's so special about NAND & NOR(apart from being universal gates) that most books on digital design try to emphasize design using these gates? Is it easy to manufacture or something? AI: NAND and NOR are preferred because they are smaller and use less power in a CMOS process than e...
H: Sharing the low voltage rail of unknown potentials... How to make Proper Floated Voltages? I asked a previous question about running circuitry off a high voltage supply with unknown ground potential. The question is here: Generating a 10 volt rail from a High Voltage Supply with unknown Ground Potential Based on ...
H: Examples of DRM on embedded systems I'm tasked with implementing a DRM on an embedded system. The device would have a limited number of times which it can run, after which it would be disabled, until it syncs with a computer with an internet to be allowed to run again. For inspiration, I would like to know of embe...
H: How do European to American outlet change frequency? So for the transforming of voltage, a transformer could get a european outlet from 240 to 120 volts. How do these switch the frequency though, do they have to convert it into DC and then generate a signal back to AC? Or is there an easier way? Or do they just lea...
H: Understanding short circuits (in Arduino) and identifying electronic devices I'm a programmer and I recently purchased an Arduino Uno and I've very scared to short circuit it. I've been playing with http://www.falstad.com/circuit/ and have been able to create a few LED sketches and a piezo buzzer circuit. So far, ...
H: Is a negative resistor a superconductor that does not require being cooled down to get 0 resistance? Title explains it, is it possible to create a superconductor using negative resistor oscillator / amplifier? As superconductors are conductors with 0 resistance. Isn't an amplifier a superconductor? Or is what I am ...
H: Does the system COM port baud setting matter for Arduino? I have a custom arduino board that is basically like any ATMega328P based setup. I'm using the FTDI friend from Adafruit to communicate with it and when the drivers for it are installed you can see in Device Manager (Windows 7 SP1) that the baud rate is set ...
H: Impedance of differential inputs on AD converters I'm currently trying to attach a rather fast ADC/DAC-converter chip to an FPGA to receive and transmit RF in the future, but getting the converter to run and attaching a signal generator and an oscilloscope for testing is my main goal right now. I'm coming from the ...
H: pcb etching paper and copper board I would like manufacture a very simple one layer board to learn how a PCB is manufactured. I prepared the layout of the circuit on Eagle Cad, and am planning to use acid etching method: use iron to transfer the toner to the copper board. I already bought the following items: Acid...
H: How can I get more amps from a voltage regulator? I'm a noob that is just getting started. I'm using an LM317T to generate 6V but I need a little more amperage. Can I just double my LM317T and resistors configuration and put them in parallel? simulate this circuit – Schematic created using CircuitLab Ignore the r...
H: Purpose of the logic gate configurations on the Kenbak-1 I was just looking through the schematics of the Kenbak-1 computer (long story), and I found this: simulate this circuit – Schematic created using CircuitLab I hurt my brain a little bit trying to figure out what that flip-flop does, but mostly why those two...
H: Simple circuit to give a pulse to a IC pin once? I have an IC that is activated when pulsing a pin high, the pin should be keep floating after the pulse. The circuit is powered using a battery, and that IC then wake up everything else (Regulator, MCU, etc). I'm looking for something like this: Battery -> Pulse to t...
H: How to create high voltage dividers without blowing up resistors I figured out that it took around 75 volts to light up a neon bulb I had. I want to make a high-voltage meter with a few bulbs specifying certain amount of volts. So as a first test, I just hooked up two 22 mega ohm resistors in series to create a ran...
H: Detect logic signal in a long distance. What type of interface to use? My daughter board uses a comparator(LM339) to output logic 1 or 0 under a 3v3 supply. The cable connecting daughter board and main board is at least 1.5m. Luckily, the frequency is not fast but the environment is full of EMI. So I want to use so...
H: Learning how my circuit works (PWM a 5V USB fan) I'm new at electronics (my new hobby) and got a lot of good responds from you guys so hope you can help me out with this one as well. I got this an USB fan that I wanted to modulate by controlling it with some PWM. First I did the following simulate this circuit – S...
H: Measuring and Replicating Electrical Codes from heating controller I'm wondering if the fantastic electronic engineering community can assist with a little project I'm attempting. I have a Rinnai tankless hot water heater that is controlled via a hot water controller (2 wires running to it, low voltage), such as th...
H: Why would the VCC/GND pins of an ATtiny26 not be aligned? In the following pinout diagram for an ATtiny26 microcontroller, a 20-pin IC: The VCC/AVCC and GND pins aren't aligned. Surely it would be easier for PCB design to connect these by going straight across rather than having to cross (requiring vias, a second ...
H: How can I find an AVR chip with built-in RF transceiver? I'm going to build a couple of small devices that communicate wirelessly. To simplify construction, I've decided to look for a chip (preferrably on a breakout board) that combines a programmable microcontroller with an RF transceiver module. I've found the nR...
H: Does a ground fault compromise the whole circuit? (this image taken from http://www.allaboutcircuits.com/vol_1/chpt_3/3.html) Based on this picture, would a tree across the bottom wire of the circuit (the solid wire, not the dashed wire representing earth) cause the person to be electrocuted? Am I correct in think...
H: Error when compiling "Does not name a type" I want to inherit my own class from LiquidCrystal that creates some custom characters during initialization. Here's the code I've written so far: MyProject.ino #include <LiquidCrystal.h> #include "MyLiquidCrystal.h" MyLiquidCrystal lcd(8, 9, 4, 5, 6, 7); void setup() { ...
H: How to add additional I2C sensor module on Arduino I have tried the GY-521 sensor on Arduino by using the guide from (http://playground.arduino.cc/Main/MPU-6050). It worked well. Can anyone guide me on how can I add another GY-521 module please? I am planning to use a total of four of them connected to my Arduino U...
H: KVL equivalent versions How do the first two statements (quoted below) logically correct when the third is viewed as voltage drops are only across resistors and the voltage rises are only across voltage sources? Where is the equivalence between those three versions? The book says: KLV has three equivalent versions...
H: Beginner resources device design/assembly During the summer I would love to get into electrical engineering. As background, I'm a computer scientist and as such, I have a fairly decent grasp of basic circuit design and electricity, which means I don't have to start entirely from scratch. I have however no experienc...
H: Microchip DIY starting from Verilog Given the Verilog description of a chip, what are the steps necessary to implement it in hardware and how would a person DIY something like this? For a specific reference. I was looking at the wikipedia webpage for MMIX that says: Hardware implementations As of July 2010, no kno...
H: 8051 interrupt priority level significance I am working with P89V51RD2 which is a 80C51 micro-controller. It has Eight Interrupt Sources and Four Priority Levels. In the above table, there is a column Service Priority which sounds like Fixed-Priority interrupt servicing. And then there are two bits for setting pri...
H: Physical Wire Size Confusion I'm going to get this wire for a simple project, and I need to get some heat shrink for it. My problem is that I can't figure out the diameter of the individual insulated wires. There are going to points in the project where the cable is going to be split, and soldered onto LED leads....
H: Find the RMS value of the periodic triangular current, if Im=1A, T=1s Find the RMS value of the periodic triangular current, if I_m=1A, T=1s. Could you tell me step-by-step how to do this? It's not a homework, I just want to find out how to solve this problem. AI: RMS means "root mean square", in the order root(me...
H: fpga clock strategy I have a current design where the input clock is 54MHz, but for some part of the design, I can do with a much slower clock. Is it better design to clock all the "slow" logic (state-machines ect.) with a divided clock? I was thinking this would achieve lower power consumption, and more relaxed ti...
H: Why is this MOSFET getting very hot? I'm using an IRFZ44N power MOSFET to drive a DC motor (24v, 4kgcm, 2A, FLRPM 500.) I found from the datasheet that the IRFZ44N has an ampere rating of 49A and still it is getting very hot. Here is the schematic: The IRFZ44N is driven from a PWM of 244 Hz. I found that it only g...
H: What are the major advantages of using a closed-loop over an open-loop and vice versa? I'm trying to gain a better understanding on the pros and cons using closed-loop or open-loop motor control. Also trying to better learn when it's more sensible to apply each one AI: If you understood what those terms meant you w...
H: Can Atmega 32 development board be used to program atmega 8 as well? I wish to buy a development board thus wish to know if this is possible? I'm a beginner so which development I should use? Any suggestions are welcome. AI: An AVRISP mkII or equivalent, and ordinary breadboard, some 0.100" headers, and ordinary co...
H: How to connect ASD bios chip In my little box full of various electronic components I've found an AMIBIOS chip from 1995. The actual chip data are the following: Vendor: ASD Number: AE29F2008-12 Another number: 9846 I want to connect this chip to the Arduino and play with it. I'd like to turn it into permanent mem...
H: Designing a Morse code transmit/receive shoe Thank you for considering my general question, which I assure you is serious! I want to build -- or have built -- a magnificent shoe that can convert taps (front of the shoe) into Morse code and transmits it (two taps of the heel) to a remote computer to then run a "defi...
H: How does SOLOSHOT work? Does anyone know how SOLOSHOT works? I'm interested in exploring cheap ways of tracking an object relative to another object. So my brother sent me a link to this product and I'm having trouble figuring out how it works. Basically, the user has an arm band and the camera tracks this user. I ...
H: Device can be powered at 6V or 12V, which is better? Why? I got this camera and need to power it. Docs say that I can power it both at 6V and 12V, but laconically say also that it should be better to power it at lower voltage, so 6V. Can anyone explain me why lower voltage is better? Since I expect that power usag...
H: If voltage is measured between two points on a wire, with no resistance in between is the voltage zero? I have a series circuit. Let's say the battery has a potential difference of 10 Volts. On two points of the wire before the current hits any resistors, I attach the readers of a voltmeter. Since there is no resis...
H: HDMI standard: Color depth = 1 I have to transmit B&W images (about 30fps) with resolution of 1980x1080 pixels. I would like to use a HDMI link between the generating device and the imaging device (to have standard connexions and signals). Is the HDMI standard specification take into account the B&W? I mean is HDMI...
H: How do I (optimally) connect Elk-924 (high sensitivity relay board ) to DSC PGM output (sinks to ground) This sounds like a very specific question, but I think it boils to a generic one -- not at all specific to this equipment. But it will take a bit of backstory to get there. My background, btw, is software. Ele...
H: XLAMP MK-R by Cree power source I was wanting to use the MK-R for a project of mine but after consulting the datasheet I burned up my first 10$ LED and wasn't sure why. I had an LDO providing 11.5V anode to cathode via gator clips. I ran the anode line through my multi-meter and verified it was pushing 450mA befor...
H: Electronic component which produces a clear clicking sound A surprisingly hard thing to search for as most references are to defects with other components. Are there any such devices mass produced? or any good alternatives. I've considered over-driving a relay and short spikes to a piezo but I'd doubt the life-span...
H: Why do electric companies measure in watts, when they be measuring in joules? 1 Joule is defined as 1 Watt of power working for 1 second. When the electric bill comes, it says "you've used 5000 Watts, therefore pay us $100". However, from what I understand, if I turn on a 5000 Watt oven for even three seconds, you ...
H: What components can an FPGA replace/emulate? I've been under the impression that FPGAs were merely, well, field-programmable gate arrays, but I've seen some example schematics with resistors, capacitors, and such in them. As such, can an FPGA serve only as a replacement for 7400-series ICs, or also for resistors or...
H: What separates a "good" eye diagram from a "bad" one? I'm running some USB verification testing at work, and the Agilent oscilloscope I'm working with returns a nice summary of pass/fail statistics along with a pretty eye diagram. Since the pass/fail is indicated within the scope, I don't need to do a ton of analys...
H: Concerning broken headphone wires I am planning to fix my broken headphones. They don´t really work in my laptop unless I twist the plug-in wire to a certain position and hold them there. I think it´s just a broken wire somewhere close to the plug-in? I was thinking of cutting the wire close to the plug-in and sold...
H: AMW ribbon cable I'm a software developer with a little hobby project involving an embedded system. I have a debug board hooked up to another printed circuit board. The connection between the two boards is via this little ribbon cable as pictured below and here. If you can't see the picture, the cable is a flat ri...
H: Fastest boot time comparisons between RPi, BeagleBone Black, UlinuXino, etc? I can find many tables comparing the specs of the latest development platforms like Raspberry Pi, BeagleBone Black, and UlinuXino. However, as all of them run some flavor of Linux, there is going to be some boot time involved before one c...
H: difference between single double and three phase If single phase is 230 V and 3 phase is 440 v then what about for 2 phase? And why is it so? AI: Here is what wikipedia says about two-phase power. Two-phase electrical power was an early 20th century polyphase alternating current electric power distribution syst...
H: How can I determine the voltage insulation rating of magnet wire? As an extension of my previous inquiry into air-core chokes, I'm trying to determine the voltage insulation rating of magnet wire, without much luck. Few of the audio air-core choke manufacturers list that data, and none of the magnet wire manufactur...
H: Differences, uses, and theory of volatile and nonvolatile memory? I understand the basics of volatile and nonvolatile memory. Volatile memory requires a constant power supply to retain data whereas non-volatile memory does not require a constant power supply to retain data. What I would like to know is this: are t...
H: balun transformer design The schematic shows a balun (unbalanced i/p to balanced output).In the design one condition is input impedance must be equal to output impedance since its 1:1 transformer and it has to follow impedance and turns ratio theory. My query is, on the output side if I have 50 ohm trace impedance ...
H: Why are smartphones and tablets ARM based? Why don't these devices use Intel processors like laptops do? Why are they restricted to ARM? Also for Windows 8, do they want ARM just for tablets and smartphones or is it also for laptops/desktops (is that even possible)? AI: Today ARM processors have a big advantage in...
H: What are the functional differences between monolithic and disc ceramic capacitors? I've inherited an older part numbering scheme, in which ceramic capacitors are divided into disc and monolithic types. Is this actually a firm division in their characteristics? If so, what are the differences? Is that nomenclature ...
H: Understanding AND logic gate I drew an AND gate as follows which mimics this diagram: (source) I understand how current flows between A and B(when both inputs are logical 1) because there is difference of voltage, maybe 6V, and AFAIK A and B are possibly connected making a circular circuit(at least via earth). But...
H: How can I electronically measure tilt/compression of a pliers or alligator-clip? I would like to electronically measure the width (really the compression/extension) to which an object's constituent blades have been stretched. Or alternatively, I could measure some other parameter which I can then map to the displac...
H: Amperage in a USB AC-to-DC power converter so it was my understanding that USB was standardized with 5 volts (V) at 1 Amperage (A), but I've seen wall adaptors with 5V and different Amperage including 1A, 1.1A, 1.5A, 2A, 2.1A, and as much as 3.3A before. Some of them had extra USB ports, but not all of them did. Do...
H: Pulling power off a battery stack at different voltages If I'm powering a device with a series-connected stack of rechargeable batteries, can I pull different voltages at different points and route them to different components? I need to run a 12V solenoid, an Arduino (6V-12V recommended), some stepper motors (aro...
H: Interface-like definition in Arduino? I'm writing a new Arduino project that uses an 16x2 LCD Crystal Display with a KeyShield. I would like to construct a menu structure in which the user can navigate using the buttons. I'm new to Arduino but I do have 5 yrs experience in C#. What I would like to do is the follow...
H: Scopes and probes I have a descent set of probes that are rated at 100MHz, overkill for my current scope, only rated at 15MHz, but I am looking at a couple of different options for used scopes right now, some rated as high as 400 MHz. Unfortunately, most of these don't come with probes, and if they do there is onl...
H: Thermistor temperature dispersion I am designing a thermistor circuit to determine if a nozzle is becoming plugged or flowing freely. My idea is to use a low resistance thermistor and resistor to form a voltage divider that when powered would become hot, and immerse that into the stream of water. The water flowing ...
H: In a USB cable, is it OK to swap the D+ and D- wires? I heard that D+ and D- are differential signals, does it matter if I swap them when connecting a USB device to the computer? AI: Summary When entering and exiting the idle state, the polarity is important and swapping the D+ and D- lines will cause problems. Dat...
H: How do I pick the right resistor for an optoisolator given a desired current? This is a follow up to this question, but isn't specific to the other one. This is both an ohm's law question and a 'how does one interpret data sheets' question. I want to minimize the current I use to hold open a relay via a trigger (w...
H: Can a 1.3W rated SOT23 MOSFET deal with 0.9 W peaks? I have a TL431 LDO voltage regulator that uses a tiny P MOSFET in a SOT23 case rated at maximum 1.3W (IRLML6401TRPBF). Can it handle 0.9W bursts of 1 second every 10 seconds without a heatsink? I would put multiple MOSFETs in parallel but current won't be distrib...