text stringlengths 83 79.5k |
|---|
H: Safe route clearance on PCB?
Some chips with high input voltages have a very tiny package.
For instance, power gauge INA226 has a maximum convert voltage of 36V, but it's in MSOP8 package, the distance between two pins in its recommended layout is only 0.22mm, can such a short distance be safe for 36V?
In another w... |
H: Multiple signals connected to relay through octocoupler
Is it possible to use multiple octocoupler transistors as switches connected parallel to the coil of the relay? I am worried about slight voltage differences across collector-emitter. Just like the image only multiple parallel octocouplers.
edit: I will just u... |
H: Is this electrically safe?
"earth" is connected to exposed touch-able parts on this coffee grinder. It does bite! It has the double insulated mark which per my standards is incorrect.
It has an unearthed input.
Schematic: https://i.stack.imgur.com/25FOs.jpg
AI: The tingle you feel is the current passing from the... |
H: Big loop gain vs. big bandwidth
If one was looking for an audio amplifier of high quality, with very low distortion, which one of these two options would be better?
Large loop gain (i.e. \$af\$) but small open loop bandwidth
Small loop gain but large open loop bandwidth
I think that the first option would be the ... |
H: Heating up water with electrical current
Is it possible that (isolated) wires carrying high current, such as 200A, passing through water will heat up that water like a boiler?
I have been told by someone that a fuse panel in a building had its bottom immersed in water and apparently this created a lot of heat and s... |
H: Why does the emitter follower clip?
The emitter follower bellow cannot follow the base voltage Vb after some point:
Vin input is DC sweeping from +10V down to -10V.
The output voltage Vout however stops following Vb at some particular voltage and settles as in the below plot:
Why is that happening?
edit:
Here is ... |
H: The use of cyclic prefix in OFDM to mitigate Intercarrier Interference
I understand that a guard interval (GI) is required to eliminate ISI in OFDM-based systems. In this context, an empty GI could be used.
But, why an empty GI does not remove Intercarrier Interference (ICI)?
AI: The discontinuity between symbols h... |
H: If I make the tungsten filament on a light bulb thinner with more twists will it make more heat?
If I make a incandescent light bulb with a sturdy and thicker filament will it also increase the temperature or just make it more durable?
AI: In a tungsten bulb, the light output is related to both the surface area of ... |
H: Does Op-Amp 741 boost the frequency of an input signal
I am trying to design an electronic circuit which does the job of a dog whistle. So basically when a human whistles using the mic of the circuit, the circuit boosts the frequency to at least 50kHz or so. I am thinking to use op-amps in the circuit to boost the ... |
H: Why does the Collector-Emitter voltage need to be ≥ 0.3 V?
I have been going over transistors in class lately and one of the "rules" is that the transistor needs minimum voltage drop between C and E ie, VCE ≥ 0.3 V.
However, no derivation or much explanation was provided to understand why this is true. I have sear... |
H: Running resistors above power rating, but with temperature within spec
I am building a circuit to heat a very small area to a relatively high (~100C) temperature. To achieve this, I'm using an SMD resistor controlled by a MOSFET, with an adjacent thermistor for temperature monitoring and control. To achieve faster ... |
H: Can 230 voltage device use 220 voltage?
I have 230 voltage appliances, those are gifts from Germany. I live in Vietnam where the voltage is 220 V.
So can I use those appliances safely in my country?
AI: In EU, it was not always the 230VAC, but also 220VAC. Then some decades ago they changed to 230VAC, but still the... |
H: need to understand the difference in delay for rising and falling reference
I am rigging up a circuit which needs to generate two signals.
One output signal(R_B) is same as input and the other signal(R_A) is supposed to have a short delay of 5 to 10 ms compared to the input.
The figure below has the waveform and t... |
H: Relay data ambiguity
I found a relay with some characteristics written on it.
The coil should be powered at 12VDC.
The other data is unclear.
IEC 255 3A 150VAC
5A 240VAC - AC1
5A 28VDC -DC1
So, in AC, the contacts should work at 5A 240VAC - AC1.
What is the meaning of 3A 150VAC vs 5A 240VAC - AC1?
Shouldn't I be a... |
H: How do GPS satellites refresh their clocks
How do GPS satellites keep their on board clocks accurate? I assume that they need to get update from a base station. But how do you make sure that after the update all the satellites are synchronized, i.e. there isn't any phase shift.
You have your base station on earth,... |
H: Making ESC for RC truck; Max motor Amp unkown
Thanks to Those Who Take the Time
The Rc car i've been using died due to its Esc being burnt out by a 3S lipo battery, and i want to ultimately replace it with something. If i were to be creating an electronic speed controller (ESC) for a specif... |
H: PCB Dimensions definition in Altium Designer
I am designing a PCB to be cascaded to this PCB shown in the following picture.
I wonder how can I define the dimensions in Altium designer. Thank you.
AI: Using PCB Board Wizard with the following setting 530 mm x 1470 mm:
Will create an 530 mm x 1470 mm sized board. V... |
H: Bias voltage of non-inverting op amplifier drops to 0 when input signal connected
I am working on a non-inverting opamp amplifier, using OPA2134, to amplify the 150mV peak signal (1 kHz sine wave playbacked) from a phone audio jack to ~4V peak sine wave, that drives a LED using a N-channel MOSFET. My goal is to tur... |
H: Calculating pitch and roll from gyro data
Does anyone know if it's possible to calculate pitch and roll angles from gyro data (without an accelerometer)? I'm trying to use a L3GD20 to measure pitch and roll. I can read the angular rates, but how should these values be converter to pitch and roll angles?
Any help ap... |
H: Problem in FSK demodulation
I have a FSK modulated signal of binary data. This I am trying to recover using PLL.
The mark and space frequencies are in the range of 1.5MHz to 7MHz.
I am struggling because, the PLL output is not stable, in the sense that the signal is varying like a sine wave and this makes the decis... |
H: Using wall wart as 9v Battery Backup
I have a CO/Natural Gas meter that requires a backup battery to be able to function (without beeping), even if it is plugged in. I find that I am replacing batteries every couple of months (I have 4 in my house). I am wondering if I can use a wall wart for the 9v supply. I kn... |
H: Switches for PCB: Mounting and hole questions
I'm designing a pcb board and encountered a problem for switches. Is it common to follow the schematic and create square holes for mounting the switches?
Please help. Thank you.
AI: For this part to properly be mounted to the PCB, it needs to have holes slightly bigge... |
H: Split power supply smoothing capacitor
In all split power supplies there will be at least two capacitors, one in between +V to ground and another in between -V to the ground. In an 300W (RMS output power) amplifier there are two 10 000uF 63V capacitor in each voltage lines.
I have one unit of 68 000uF 125V capacit... |
H: Sources on designing a precise feedback loop for designing a linear power supply
I am a student, and studying Electrical Engineering now. I was tasked with building a 24VDC to 12V dc linear power supply. One of the requirements was big precision of line/load regulation (up to the fourth decimal). From what I read, ... |
H: Program SPI flash on board after soldering
I'm developing a USB DAC using XMOS XHRA-2HPA as USB->I2S interface. XHRA-2HPA is a sort of highly specialized uC which requires a firmware and configuration data to be stored on external SPI flash chip.
I want to install a service connector on the board to be able to repr... |
H: Signal Conditioning of the conductive Polymer?
I have a conductive piezoresistive polymer which gives the resistance changes according to the applied force and strain. What could the first step to start the signal conditioning. The goal of the Signal conditioning is to have the signal output is between 0-5 volts fo... |
H: Powering CO2 sensor with Battery
I have a K-30 CO2 sensor connected to a Raspberry Pi 3 model B. When I connect the sensor to the Pi via serial and power the sensor with the Pi, my program works fine: the CO2 concentrations are displayed on the screen.
On the other hand, when I try to power the sensor with a portab... |
H: What does MKBS mean?
I found some WIMA MKBS capacitors, not a dielectric I have seem before. WIMA has not been helpful so far (nor Google). Any idea what MKBS means?
AI: Apparently, they are obsolete "Metallized polycarbonate capacitors". Not sure how critical is your application, so you may or may not want to tr... |
H: Second Order Bandpass Filter vs Second Order High Pass and Low Pass in Series
Is using a second order bandpass filter less effective than using a second order high pass filter and a second order low pass filter one after the other?
I tried a bandpass filter to filter out frequencies between 0.5Hz and 15Hz, and foun... |
H: Can I run custom firmware on a pre-certified RF module without needing to redo full FCC certification?
I need BLE connectivity in a product, so to save costs on FCC certification, Bluetooth SIG membership, etc. it will use a pre-certified module for this purpose.
Usually such modules work in one or multiple of the ... |
H: Companion capacitor model in circuit simulation
Im looking for a very simple example of an algorithm using the capacitor companion model. I have searched online in several different combinations to try to find an example but cant find one that gives me all of the information I need.
I just need to see how to model... |
H: Is there such a thing as filtered LEDs?
I'm trying to "re-engineer" (the original designer doesn't manufacture the board anymore but they were kind enough to provide me with the diagram) a circuit that replaces an incandescent bulb with a LED, and it specifies a white LED "filtered" to 3000K. My question is, does s... |
H: Making sense of NOR get output
I've been trying to figure out the various logic gates and am currently looking at a NOR gate as in the picture above. After reading various sites, I still don't get how this works as far is the output is concerned.
Based on this picture and what I know, A and B being what they are ... |
H: How does the dish size increase reception range of radio signals?
For example if you want to transmit a song through FM, does the receiver's dish size actually increase the range in which he can detect these signals? if it does then how?
AI: A bigger dish is simply able to "catch" more of the power being sent throu... |
H: Why can't stepper motors be powered off of 9V batteries?
According to Adafruit, "you can't run motors off of a 9V battery so don't waste your time/batteries!"
I've been searching around and it seems like most sources do use wall adapters, but without justifying why. What's the explanation for this?
AI: It isn't qui... |
H: Frequency hopping of Si4463
I ask a question in this , but it has been closed, I just want to know how to realize a simple frequency hopping.
I use RH_RF24 to control SI4463, and success to send some simple data. But I know maybe there will be disturb . So, I want a way to avoid disturb.
First, whether there is a ... |
H: Are special antennas required for 802.11n connection?
I'm looking for a chip or a PCB antenna to add to a module. I would like if there's difference between antennas that make some suitable for 802.11n WiFi connection and some to 802.11b/g.
AI: No.
Antennas do have a bandwidth; for example, an FM Radio antenna will... |
H: Measuring isolated AC signals with a single ADC that has common ground inputs
In my setup I have a power transformer (XFMR6) and some load connected to it.
Need to build a device that takes samples of U, I at the input and output of the transformer.
The measuring networks have to be halvanically isolated from the c... |
H: 555 timer monostable operation not so stable
I'm experimenting with a bunch of Texas Instruments NE555P IC's that I bought recently from Amazon, I made a basic monostable operation circuit on a breadboard with the following schematics
simulate this circuit – Schematic created using CircuitLab
When I push the butto... |
H: I2C sensor not detected on Raspi3
I am trying to set up a pH sensor from Atlas Scientific using a Raspi3. I am using this Tutorial to set it up. I have set the sensor to I2C as the LED is blue. The circuit is shown here. I am now trying to run the i2cdetect -y 1 command, but when it prints out all the I2C ports are... |
H: LED matrix design
I am looking to make 16(columns) x 14(rows) LED matrix. Cathodes are connected to the columns and anodes are connected to the rows.
I want to drive rows(anodes) with I/O input expander MCP23017 which is controller via I2C. I am not using shift register because I need GPIO pins from microcontrolle... |
H: How to calculate amp hours when voltage and amperage changes
I have a Lithium battery pack. All I know about this battery is that its no-load voltage is exactly 20.0v when charged. I then connect a load to this battery; I have no direct information about the load, however, the load is connected through a power te... |
H: Italic or upgright font for circuit components
Should one italicize symbols used to represent electronic components in a circuit diagram?
Some context:
According to NIST, typefaces for symbols should be italic if they represent a quantity or variable. The problem I see is that sometimes this is the case and sometim... |
H: LDO selection based on power dissipation
Perhaps You could help me confirm my thermal discussion on choosing appropriate LDO?
MIC5225, a 16Vin and 150mA output current quaranteed LDO.
So, parameter-wise I would guess that I could use this SOT23-5 package and get it to run from f.i 14Vin to 3.3Vout and 100mA output.... |
H: High side regulation of current for proportional valve
I'm working with a circuit which is regulating the current over a generic, proportional solenoid valve (L1 in the schematic below). The characteristics of the valve coil is unknown/will vary and the task of the application is to compensate for resistance/induct... |
H: Is a load needed to measure the voltage drop of a long cable?
Should be a simple yes or no question.
If I attach 20ft of 16AWG cable to a power supply, in theory I should see some voltage drop. Do I need to place a load at the end of the cable to read the actual drop or can I just connect my multimeter to read the... |
H: Coil switching for resonance with an arduino controlled TRIAC
I have a capacitive system which I need to power via resonnance using a coil. Resonance occurs at several frequencies, therefore I need a different coil for each frequency. So far I've manually switched the coil whenever I needed to use the other resonan... |
H: Deriving 5 V and 3.3 V from 12 V using single IC
I am making a college project which requires me to use a 5 V LCD display and a 3.3 V microcontroller.
I am using a 12 V power adapter to power to complete circuit.
I am using LM7805 and LM3940 to generate 5 V, and 3.3V, respectively. Is there any IC that takes in 12... |
H: Y to Delta transform with inductors?
Does a Y to delta transform for resistors work the same way when inductors a connected in a similar fashion?
simulate this circuit – Schematic created using CircuitLab
I have a load bank that is wired in a Y configuration. I'm given the specks for loading in a delta configurati... |
H: Anti-static home setup
As suggested in an answer to an earlier question of mine, bonding to a laptop can be done by connecting an anti-static wrist strap to the ground of an USB-port. (After disconnecting the AC-to-DC adapter.)
At which locations should there be a 1E6 ohm resistor? My quess: at A and B.
AI: The pur... |
H: Software for drawing circuit schematics and SPICE simulations on Mac?
Problem:
I'm trying to find a robust, user friendly, schematic design and SPICE simulation software that will run on a Mac. I have used Multisim for design and simulation in the past.
I'm wondering if there are any equivalent programs out ther... |
H: Does the diameter of the coil in a motor determine the amount of volts needed to run it?
I am making a DC motor and i got coil from a transformer and the coil is a lot thicker than the coil in your usual DC motor, i want to ensure that the motor runs on 9 volts, the coil is about 1 mm in diameter.
So my question ... |
H: pulse width modulation versus amplification
If I want to make a sine-wave inverter where the output AC voltage is lower than the input DC input voltage, how can I see that using pulse-width modulation will be more efficient that just using a transistor as an amplifier if I have a sinusoidal gate driving signal at t... |
H: Would this circuit work as a binary calculator?
Forgive me if this is a stupid question with a poorly drawn circuit diagram. I've never really made anything electrical before, so this is all very new to me.
I've recently been wondering how transistors can be used to add numbers together, and learned that it is done... |
H: LF-RFID demodulation
I'm trying to read a LF (low frequency) RFID transponder, it works in the following manner: It uses load modulation, the receiver (the base station) generates the carrier and the transponder modulates it using magnetic coupling (like a electrical transformer), the transponder (or tag) being rea... |
H: Fixing electrical controller (with joystick) on Pride Quantum 600 power wheelchair
The momentary switch is bad on a Pride Quantum 600 power wheelchair. The picture is below. It turns on, but you have to hold the rubber button/switch in the correct spot with the right temperature before it will turn on. What coul... |
H: What is the rating current of zener 1N702
I'm trying to solve a problem which requires the rating current of this diode 1N702. In the book, the author uses 1N961 zener for the examples and states that the rating current \$I_z = 12.5\$mA. In the exercises, however, the author requires 1N702. The question is
Design... |
H: How to find the resistor using the equivalent resistance?
How would I simplify this circuit so I can find the missing resitors using equivalent resistance?
AI: Break the circuit into simpler components. As an initial step, replace the 3 R's in parallel with R/3 resistor. Re-draw it and then simplify and then proce... |
H: Why the current in X ray tube is in milli amps
If we see a X ray generating tube the voltage applying to tube is in kV, but the tube current is in milliamps. Why this current is in mAs not in amps?
AI: An X-ray tube might require 100kV. A current of only 1A would be 100kW, which is a fairly large amount of power ev... |
H: Why are there sensors that encode their readings as serial sequence of PWMs?
This is a comment of @CuriousCat, but I think it deserves the attention of an actual question:
The sensor used in the original question outputs a serial PWM-style signal like this:
What's the advantage for a sensor to encode its output i... |
H: KiCad pin name to net name
Is there a method in KiCad to quickly map a pin name to a net label?
Example.
On the picture below, I want to name the wires with the pin names, as has already been done with GND. I'm currently doing this manually for each pin and am wondering if there is a smarter way.
AI: There is a pat... |
H: Is 'hot-wiring' two contacts a proper way to bypass a broken button?
I have a broken cell phone, and its power button is not working at all.
Examining the device's motherboard I have discovered the button has five pins. As seen on the manufacturer's service manual, the connections look like this:
My theory is tha... |
H: Are there standards for digital sensor links?
Following this question, @curious_cat had more questions in comments that deserve a proper Q here:
Is there any standard encoding that has evolved on the digital encoding side? Just as 4 to 20 mA is de facto standard on the analog side especially in process control?
So... |
H: Calculating the core area for a low frequency transformer part 2
I posted a question a while ago about calculating the core size of a transformer when the frequency is relatively low (<50Hz). Thank you to everyone for the comments and feedback. I have done some more research and would like to post a follow up quest... |
H: MPS430 Launchpad Keypad
I tried to use my MSP430G2553 launchpad with a keypad using
http://www.pjrc.com/teensy/td_libs_Keypad.html
http://bildr.org/2011/05/arduino-keypad/
http://www.instructables.com/id/Using-the-sparkfun-12-Button-keypad-with-the-ardu/
http://www.ti.com/lit/an/slaa139/slaa139.pdf (i just tried s... |
H: BJH H-bridge going in reverse but not forward, LL transistor overheating
I've built one of this BJT H-bridge to control a DC motor in an old R/C car of mine, but I'm having problems with it and wanted a few tips to help me debug the board.
The motor is a 2-wire DC with about 1.2A stall current.
Below is my schemati... |
H: Common Base Amplifier
I am thoroughly confused on this topic. How does "common base" even make sense? If the base is grounded then the transistor is turned off, so how does the input reach the output?
AI: The fact that the base is common to the input and output signals does not imply that the base is at the lowest ... |
H: How can USB extension cords affect of USB charging?
I want to use USB extension cords to extend the USB power cords for various devices (specifically, an iPad and Android phones). When adding a USB extension cord to a closed system where the manufacturer power cord/adapter connect a device to a 120v outlet, how mi... |
H: Power line voltage out of phase with ambient 60Hz electrical noise - why?
I just bought my first oscilloscope and have been tinkering with the measurement of different signals just to learn the ropes and familiarize myself with the scope.
One of the first things I noticed was the ambient 60Hz "noise" that is picked... |
H: How to monitor data exchange on single wire?
I have two modules that communicate over a single wire. Where would I even start about monitoring the data without introducing any kind of interference to both modules?
One of the modules has to be deleted/bypassed and my own controller will be simulating that module. Ho... |
H: Datasheet or termal resistance for this heatsink
Can someone please help me find a datasheet or at least the thermal resistence for the following TO-220 heatsink?
My local supplier doesn't have more info about it. They just marked it with those numbers that I don't know what they mean: K6439 and 183001/15 (15 is ... |
H: Difference between natural response and forced response?
Reference
Second post on EdaBoard.com
Time response of a system is the time evolution of the variables. In
circuits, this would be the waveforms of voltage and current versus
time.
Natural response is the system's response to initial conditions with
al... |
H: What is a Nokia FAID?
Nokia is a mobile phone brand, but what is an FAID? I tried searching but no definition came up. I'm guessing it's a security feature checked by the hardware in order to function properly.
AI: I brought it into context with firmware updating Nokia phones and came up with this:
The reference st... |
H: Looking for suggestion on microcontroller
I took a course on using microcontroller of Intel 8051 long times ago. Recently, I am going to develop a module to control precise-timed TTL output and my instructor suggests to use microcontroller (MCU) instead of something like 555 timer. I am planning to get one for tria... |
H: Soldering a VGA cable - number of wires doesn't match
I decided to open up a VGA cable which started to produce only red / blue / green colored image. I thought that inside I will find something like shown on this scheme:
Instead I found that my VGA cable is a more complex one. Allso the wire colors do not mach ... |
H: Maximum distance for AVR UART on 3.3V
I need to connect two boards using UART of AVR. I wanted to know how much can be the maximum length of the cable between two baords if VCC is 3.3V. I dont want to use rs232 here.
This question didnt help
AI: I can't answer as to the maximum length, but at 9600 baud I wouldn't e... |
H: What is this go-no go function in some oscilloscopes and how can I use it?
I have seen some oscilloscopes with this option (go-no go function), but I don't know what it is.
I couldn't find anything about it in my searches.
What is it?
AI: See Mask Limit Testing
Capture a signal from a known working system, and [t... |
H: Design an amplifier with maximum voltage gain
Problem description is as follows: Design an amplifier with maximum voltage gain without output saturation.
The following diagram was given:
I've tried doing a T-model for the first part that goes up to C2, and I got the following:
Vo=gmVgs(RE1)
Vin=gmVgs(1/gm)
Resulti... |
H: Simplest way to measure 98 to 140 Ohm range with an ADC?
I have a thermistor that should vary between 98 and 140 Ohm and am looking for the simplest circuit that will convert this into something meaningful for a 10 bit ADC in the 0-3.3V range.
Precision wise, 0.4 Ohm or so on average would be great, and let's just ... |
H: Is an instrumentation amplifier design same with a standard op amp?
Is instrumentation amplifier nothing but a standard op-amp with a different configuration? I wonder if the inner complicated circuit of an instrumentation amplifier same with standard op-amp's.
At one forum I read: "An instrumentation amplifier is ... |
H: Why do we need the MOESI/MESIF protocols?
As I understand, those two protocols add an extra state to identify which cache should respond to a miss request from another cache for a particular cache-line.
But, in the MESI protocol, only one cache can have a cache-line 'A' in the modified state. The other caches can h... |
H: Calculating the voltage generated by an 40KHZ Ultrasonic Tranceiver
In particular, this device: http://www.hexamite.com/hx40str.htm
Electrical Specifications HX40STR
----------------------------------------------
Parameters Values Units
Operating Frequency 40 kHz
Input Voltage ... |
H: DC-DC 12V converter using switching voltage regulators: heatsink dimensioning and board design
To replace my overheating linear regulator DC-DC converter, I've designed this new board. This time I used a couple of switching 12V regulators (LM2575-12V). I'm using two 1 amp regulators because my local supplier doesn'... |
H: Flash Memory on an ASIC
Are flash memory and ROM also considered integrated circuits? And so, is it possible to embed a flash memory or a ROM into an ASIC?
AI: A ROM which is constructed on a monolithic device would be an integrated circuit. A ROM which is constructed using discrete decoders, multiplexers, and dio... |
H: How to understand the functions of a Therm-O-Disc 12S20 H24V?
I am an electrical novice and have a Therm-O-Disc 12S20 H24V (original image) relay that I'm attempting to understand.
The only meaningful documentation I've been able to find is this, 12S, 14S, 15S Series Time Delay Relays and Sequencers. Page 3 of the... |
H: Bringing compiled device to market (and how to power)
(Preemptive apology if this is the wrong place to ask; pointers to the right place appreciated)
I've thrown together a device using a Raspberry-pi, touchscreen (plugs into pi) and small monitor type thing which has its own power cord and brick. I've for the ti... |
H: How to modify a router's antenna?
I have tried to extend the antenna of my router in order to increase its range. I added a wire few cm long. There was no modification however in the range. The power (-db/m) was the same. Why is that?
AI: You can replace the antenna with one that has higher gain , there are several... |
H: Is it possible to buy high pass filters that work in the 100 kHz range?
I want a device that rejects 100 kHz but lets through 150 kHz. I tried building a simple passive first order circuit but the roll-off wasn't sharp enough. Most standard electronics vendors don't seem to sell anything below 1 Mhz.
Alternatively,... |
H: Connecting strain gauge output terminals to an instrumentaiton amplifier
Before posing the question the figures are about as follows:
In Figure 1 a strain gauge's outputs v1 and v2 is connected to an instrumentation amplifier’s inputs. For simplicity buffering part is not drawn and I'm assuming the signals are ba... |
H: Compilers and MSB identification for Data types
I would like to know two things that is making my head quite confusing these days.
If i allocate an int in C18 compiler I know it will take two bytes and, if I initialize a pointer to the variable, say:
int x,*xptr;
xptr = &x;
then I have to access *xptr for first by... |
H: Why would I use a thermistor instead of a LM35/36?
Is there any advantage over the other in using a thermistor versus a temp sensor like a LM36 or LM35?
The only major difference I can see is that the LM35/36 have voltage limits of 5.5V and the thermistor is more of a really temp sensitive resistor that I could u... |
H: Kicad trace thickness and autorouter
Using Kicad, how do I go about specifying a trace thickness for power rails larger than the default in such a way that this info can be used by freerouter?
A section or page reference into one of the manuals would be fine, I really just need to know where to start reading.
AI: ... |
H: Combined chip with LDO and Buck, what use?
I am searching for a Li-polymer 1A charger with a 3V regulated output. I have found Linear LTC355x serie but can't, after reading many "LDO vs Switching" debates, understand the use of both on the same chip. LTC3553, for example, offers a 200mA buck and 150mA LDO.
I need t... |
H: Charging phone battery with a high current source
I am working on a project which the goal is using some android tablets to show pieces of video file to form a multiscreen. One electronic problem that I have faced is:
The tablets should be always on. Currently I am using their own wall adapter which is rated at 5V ... |
H: Boat; How to charge Leisure batteries the first time?
I will have 4 x 12V 100ah leisure batteries for my boat. They will be wired in parallel(using staggered wiring). My alternator is 12V 50amps. The batteries will be charged when the boat is moving. Therefore, best case scenario dictates it will take at least 8 ho... |
H: XBee Packetization problem
I've a ATmega368, currently working on top of a Arduino Uno, which its final purpose will be to process some sensor information and send it through XBee (configured as a router) to the coordinator.
So, basically I've a arduino, which its Tx pin is connected to the pin 3 on XBee (configure... |
H: Physical Implementation of RSA on Embedded Systems
RSA can be used to prevent unwanted software modifications on an embedded system. How can this encryption algorithm be implemented physically? I mean, which peripheral/main units can be used to check the digital signature and how do they do this?
AI: RSA is a softw... |
H: Which chip to use for automation using Wifi?
I am working on a project where I will be controlling a device using android mobile phone (WiFi as medium). Which is the chip at present in the market which is low cost and effective for my application. the size is of no concern (it can be big).
AI: I am currently evalua... |
H: Programming CC430F5137 using another microcontroller
I have a CC430F5137 and the board schematic all ready for my application to that requires capturing data over bluetooth. I wish to program the CC430F5137 using another platform except the conventional programmer since I'm short of money for the project. Other pla... |
H: Can't get a precise reading with PT100 temperature sensor
I am trying to get more precise temperature value from PT100 ( 2 wire ) sensor with Arduino.
Here's how my circuit looks like :
When the sensor is about 20 °C I get a value on A5 pin that is 432 and when the sensor is about 30 °C I get a value on A5 pin tha... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.