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H: Pulldown resistor on output pin, how does output still work?
On a part I'm working with, it says that you can configure the part to operate in a particular mode by "strapping" a particular pin to ground. That is, it wants you to use a pulldown resistor to pull it to ground. From what I understand, when this part st... |
H: Ideas to measure 2D position of an object constrained to X-Y plane
I am working on a project, and an aspect has come up where I would like to measure (track continuously) the X and Y position of an object across a 2D plane. The object is moved by a person, with the object's movement constrained to the 2D plane (so ... |
H: Reference source for copper conductivity vs. temperature
I am looking for a curve for copper conductivity vs. temperature over the -55°C to +180°C range (covers std. ranges of semiconductors plus NEMA class H insulation in the case of magnetics / motors) but cannot seem to find anything searching on the internet.
I... |
H: Optoisolate 2MHz SPI communication
I need to isolate the SPI communication between two chips.
The bottleneck of the communication is on the slave, which apparently can handle up to 2MHz SPI clock frequency.
My idea is to do this isolation using optocouplers. On this first attempt, I used the 4n35. It was just not w... |
H: Know any manufacturer of beeswax capacitors?
Other than Jupiter.
I need to replace a vintage beewax capacitor. I don't want other types of waxes.
AI: To answer your question, Aerovox makes beeswax capacitors. You may also google bumblebee capacitors.
FYI, you catch more flys with honey (or in this case you catch mo... |
H: Methods to accurately move an object across a 2-D plane
This is the opposite/complement of my previous question, which concerned measuring the precise position of an object as it is moved/drawn by someone over a short duration. Assuming I use one of @Rocketmagnet's suggested approaches (probably using linear encode... |
H: electrical switch controlled remotely via mobile bluetooth arduino
Without arduino what other ways? If I use arduino should I use ardunioBT and write a mobile software for communicating with arduinoBT. Or using Amarino with a arduino board is better (as amarino has a software portion already). Also there are many a... |
H: Ultrasonic rangefinder (for beginner)
I'm quite beginner in electronics.
So, to begin with, I wanted to make a simple (?) ultrasonic rangefinder, based on microcontroller. So I had a few questions for experienced in electronics:
What would be the best environment for development - breadboard, or something else ?
W... |
H: male-male VGA cable wiring
I need to build a VGA cable (assemble connectors to wire).
I need a male-male cable.
Is its wiring straight or cross? (should i connect 1-1,2-2,... or something else)
Thanks
AI: Yes, all VGA cables are wired 1-to-1, whether they are regular male-male cables or the relatively rarer male-fe... |
H: How is etalon important to tunable lasers?
Tunable lasers utilize some kind of feedback in order to maintain the same optical intensity. I've read that there is some kind of etalon trans-impedance amplifier that works in order to generate the output necessary for this feedback. I'd like to know how the reflecting s... |
H: Powering RGB LED's and using a PWM chip; series or parallel?
I'm working on a hobby project where I will be using an Arduino board and a TLC 5940 to control 5 different groups of RGB LED's. The number of LED's in any particular group will not necessarily match the number in another group i.e. there may be 20 in one... |
H: LiPo vs. NiMH for kid's toy
I've been researching here and on google regarding potential battery technologies for a toy that I want to make for my kids. I was hoping to get others' perspectives on this, keeping in mind that this is for a child.
I'm trying to look at this from all angles, but safety is the most imp... |
H: How can I find temperature of microcontroller?
In some boards which environment temperature goes up could cause high temperature in micro controller. This will effect on micro and bad situation maybe occurs. For example I have designed a device which used in a box. This box was near a motor and after some load to m... |
H: Bluetooth SPP (Serial Port Protocol) and Cobra Tag
I have been trying to build something similar to the Cobra Tag (Check out the video). I have written a prototype android app which uses SPP to connect to a bluetooth module and exchange commands, which is working great. But, i have a few queries
From what appears,... |
H: How do I calculate necessary mosfet turn on/turn off time?
I'm trying to measure capacitance of C1 using this design:
Everything works from 3.3V.
The mosfets is my addition to it - i want to discharge the capacitor after each half-cycle. Everything works OK in low frequencies, but i want to run it on 8Mhz and then... |
H: Diode between VCC and GND
I was having a look at some guitar effect circuits and came across with a company that offers PCBs for some well known circuits. I have noticed that most of ther circuits have a 1N4001 (D1) placed between VCC and GND, without any kind of resistor in series.
This one, for example:
At first... |
H: Can Grid Dip Oscillator (GDO) detect WiFi, Bluetooth and NFC?
Can I use GDO to detect those waves? Can I buy one somewhere or I need to build one? I would to have digital one, that will just show the frequency of the waves.
AI: No, a grid-dip oscillator is fundamentally a signal generator, not a signal detector. It... |
H: Inductor ground, where to put it
So I'm building a tachometer for my car. It's pretty simple, basically I have a wire wrapped around the spark plug wire about 10 times, and the 30-50k volts travelling through the spark plug wire should be sufficient to induce a small current through the wire wrapped around it. I'm ... |
H: Antenna that can be used for large range of frequences?
Is there an antenna or device that can be used for WiFi, NFC, bluetooth, GSM for use with a frequency counter to measure the frequency of the waves?
AI: For laboratory use, it is common to use a Log-periodic antenna, which is well-behaved over a large frequenc... |
H: RF Antenna Frequency
I'm curious as to the ability of an antenna designed for a specific wavelength, to work on another wavelength. For example, I have a half wave antenna that is 1.5m long, which would be ideal for a 100MHz signal. Now would that same 1.5m antenna work well on a 150MHz signal, or an even higher fr... |
H: Connect two Ac to Dc adaptors in series
I have a modem with a rating of 10 VDC and 1A but I dont have a adaptor for it. Instead I have two 5VDC and 1A adaptors. Just wanted to know if I connect these adaptors in series would It work ?
AI: This will probably work OK provided that the outputs are both isolated.
ie i... |
H: Is it possible to connect a reed switch to two separate arduino boards?
I'd like to add a bit of redundancy to a security system. I use reed switches for doors. How can i safely connect the same reed switch to two separate arduino boards? (the boards are not connected between them in any way, they use separate adap... |
H: Log Periodic antenna Design
What are the specific formulas for designing a LP antenna? Values like boom length, spacing, number of segments needed, and segment width? desired range is 500 to 5000MHz. Thanks!
AI: You are liable to find much information on this from eg amateur radio sites such as ARRL or RSGB, but al... |
H: How to find a DIP component implementing this simple logic?
I need to implement this logic in a very simple circuit. It will be perfect if I can use a single component in a DIP package, implementing the logic. How can I find one?
AI: That's a 1-to-2 demultiplexer, where the lower input is the select line. You can u... |
H: Algorithm for value range mapping
My question perhaps belongs to general ability test or something like that. It is not directly related to Embedded devices.
I have been given a variable resister which can rotate infinitely and is of 10kΩ. ADC is set for value range 0 to 1023 sampling. By which I've to control ligh... |
H: Ideas to stack multiple PCBs on top of each other?
My design has a number of boards stacked on top of each other. I would like to connect signals across the boards. The boards all need the same 10 signals running through them (all boards from top to bottom), so that simplifies it a bit.
What could be a possible sol... |
H: Measure weights with arduino
I want to measure weights with arduino. After the measurements, i want to analyze the weight data of the measured objects.Precision is not very important, but it should be work in the range of 10 to 100 kilograms.
Is there a force-sensing socket, weight-sensor or something similar for ... |
H: TLC 5940 PWM driver blank input and pull-up resistor
I've read some of the data sheet for the TLC 5940 and it states the following about the BLANK input:
Blank all outputs. When BLANK = H, all OUTn outputs are forced OFF. GS counter is also reset. When BLANK = L, OUTn are controlled by grayscale PWM control.
Look... |
H: Kinect data to a microcontroller
Before I begin, I understand this is a very broad and open ended question, please be patient with me. I am a complete newbie to this. After looking around I found various ways of interacting withe the Kinect sensor.
ROS, OpenCV, Processing,Matlab....
But they all seem to need a PC ... |
H: controlling canon camera
i have a canon EOS 550D and i want to control it from computer. i had good result with taking photos with an ir led, arduino, and multi camera ir control library but i want to control also focus, and, if it is possible, the exposition (f number and time). i've tried to have a look but i don... |
H: VHDL - How to reduce signal's dependencies and optimize speed?
I'm wondering how to optimize comparison a wide counter value with few defined values. Maybe it will be easier if I show it on example - let say there is a receiver that gets data in well defined format - 1004, 8-bit symbols are grouped in one frame. In... |
H: Altium Error? What is this reddish box?
I've been to a couple introductory Altium trainings and everything goes fine and dandy. This is the actual first board I am working on by myself. I've been learning so much just by doing stuff myself but there is something that I can't seem to quite understand.
Whenever I tr... |
H: Interface a 5v pressure sensor with a 3.3v ADC
I'm trying to interface a pressure sensor (MPXV6115vc6u) with a 3.3v ADC. My board is providing a 3.3v (it's a XBee power regulated board, via a Li-Po battery).
To wire the MPX sensor, I need to:
Step-up the 3.3v to 5v to power up the sensor
Convert the 0-5v analog si... |
H: LM3915 to drive more LEDs / basic questions about PNP transistors in saturation
As a few others here, I'm trying to drive a few (10) LEDs from each output of a LM3915 vu-meter chip. I've read different posts, and it seems the universal recommendation is this great answer.
I have, however a few difficulties understa... |
H: Attaching a LED to PIC's Rx pin
I need some way to know whether the microcontroller (PIC) is receiving (or transmitting) any data. So I thought of keeping a separate LED so that it'll blink when any data transfer occur.
But I need to know how to attach this LED. Is it OK to directly attach an LED to PICs Tx (and R... |
H: Arduino Uno, weird characters sent to COM (SoftwareSerial)
I'm trying to send ASCII characters from Arduino UNO to a computer serial port. I'm using a cable with a male COM connector, attached to the computer's serial port, and three wires (TX, RX and Ground) on the Arduino side.
I used pins 12, 13 and Gnd as shown... |
H: CAD Schematic pin arrangement approach
I was looking for related questions here, and the closest one I could find was this one: Industry Practices for Schematic Design?
However, it does not address my specific question, so here goes: I am not an EE and am just trying to learn Eagle so I can break my reliance on Exp... |
H: Why does it hase a power supply for the rs232 to rs422?
We have a anemometer with RS422/485 communication, and we would like to connect to the PC, but we have only RS232 so I would like to purchase a converter, but some converter has an external power supply, some not. The maximum distance will be less than 100m. I... |
H: LED and motor connected in parallel
i built a vibrobot pictured above.
i now want to connect a led to the working system.
sadly when i connect the led in parallel, it will not work.
power source is a CR2032 3V coin cell. motor is small pager dc motor.
im trying to keep number of components at a minimum
AI: You ... |
H: Covering PCB Pads
I have a PCB that was poorly designed and there is a ground pad that is too close to a signal pad. As a result, the signal pad on the surface mount component will short to ground. I was looking to use some ink or other material to cover the ground pad. The pads are too small to fit Kapton tape. Ar... |
H: FCC and CE Testing / Failure Resolution
I'm seriously thinking about (practically committed to) taking one of my products through FCC and EC testing and it's my first time doing so. It's Arduino based electronics running off a 16MHz crystal with an Ethernet Controller running off a 25MHz crystal and an RFM12B 433 M... |
H: What is it that strips vocals from audio when a 1/8" audio jack is partially unplugged?
Every once in a while, my eighth-inch audio jack will slip loose and I'll seemingly lose only the voice part of a track -- leaving somewhat of a "karaoke" version. What I would guess about how audio plugs work suggests that I'd ... |
H: Is there a C671x DSP development kit with more than 16M Flash?
TI's standard kit C6713DSK has only 256K bytes of Flash, which is too small for my application. Is there a third-party DSP kit that has a larger Flash like 16M bytes?
AI: The Daughter Card interface of the DSK6713 is memory mapped though the same interf... |
H: c18 assembly inside function problem. unidentified label (bit names)
Here is the data_write function I'm looking at. I've been told that this method (from the textbook) is not good and I should be using the C method (that is currently commented out). When the Cbits method is used, any arguments after the _asm/_en... |
H: How can I activate a circuit with a remote control
I want to make an system which can be activated by a remote control, or even by a switch. The goal is to turn on something wirelessly, something simple such as an LED.
I have known that I could use a relay in order to do such thing, but I am not quite sure if it is... |
H: Garage Power is low...any way to boost?
First of all, I'm an active StackOverflow user. This is my first time on Electrical engineering, and I HOPE this is the right place to ask this.
I just moved into a new apartment. The breakerbox is no where to be seen sadly. My wife to be has told me that the garage is m... |
H: Mains Power indicator maximum current draw
I am building a circuit like this:
From here.
This got me wondering how much current can I draw from a circuit like this?
The question would seem to be what is the wattage of an capacitor?
Edit:
What I am trying to ask is can I draw 100mA or 1A? And how would that affect ... |
H: Tunable Lowpass Filter
I would like to design and build a tunable lowpass filter. I would like to adjust the cutoff frequency from 1 MHz to 500 MHz. Requirement on the resolution would be something like 10-50 MHz, obviously, it's not that critical.
I am going to send a programmable clock signal through this filter... |
H: 1-10V fluorescent lighting digital control
I have a number of fluorescent lights installed that use 1-10V dimming. Note that this is not the same as 0-10V dimming as used in older theatre equipment.
The control gear for the lights outputs 10V on the two control wires. When open circuit, the light is at 100%. When s... |
H: Impedance Matching for Short-Low Frequency Traces
Is it necessary to have impedance matching for short PCB traces if the frequency is lower than say 100MHz ? I've read somewhere that for a trace to be considered a transmission line it should have a length greater than 1/8 of the wavelength of the frequency, and so... |
H: Best practice design ground and shielding
Case:
I design a pcb with a microprocessor and a adc (I'll leave out the details).
Is this correct:
The digital ground and the analog ground should be connected, but by a small passage.
Next question:
If the pcb have hole's for mounting to a metal chassis, should the skrew'... |
H: Arduino UNO Timer issue
i seem to be facing a weird issue here. First time working with AVR timers. Basically what I am trying to achieve is to set timer2 (with prescaler val @ 1024) and use CTC mode (with val 78) to get 5ms timer ticks.
Every 5ms i just display the current framebuffer on a row of LEDs and every 1s... |
H: Are 32-bit ALUs really just 32 1-bit ALUs in parallell?
I'm reading the high esteemed text Computer Organization where this picture is found that is supposed to represent a 32-bit ALU:
Is this technology really how it's done, just a lot of 1-bit ALUs, so a 64 bit ALu would just be 64 1-bit ALUs in parallell? Some ... |
H: What characteristics of magentic coil is the most important for VLF sensitivity
I try to sense a VLF magnetic field (1-100Hz) by using a coil. The field is very weak and in most of reading there is too much noise. Is there the most important characteristic of the coil, should I look at first if I want to improve my... |
H: What is the equivalent thevenin resistance of a digital output port on an Arduino Uno R3
How would I determine the thevenin equivalent resistance?
AI: You can't directly, at least assuming there is nothing between the arduino output and the microcontroller output.
Microcontroller manufacturers don't spec output res... |
H: How to read high voltages on microcontroller?
I want to read high voltages, like ~50V, using a microcontroller. I plan to put this as an input into the microcontroller's A/D line. But of course, you shouldn't have voltage that high on the input of a microcontroller or it'll fry.
How might I read high voltages? The... |
H: MAX232 circuit, what is the purpose of the capacitors?
Possible Duplicate:
Can I use 10\$\mu\$F caps in a MAX232?
What is a decoupling capacitor and how do I know if I need one?
Kindly refer to the following typical MAX232 circuit:
I am still not quite sure I understand capacitors correctly, and while building t... |
H: Arduino SPI Clock Speed Configuration
I am trying to communicate with a Nokia 1202 LCD with my Arduino using SPI.
The LCD using the STE2007 Controller. As per the datasheet here @ page 12, you find that the min time for SCLK is 250ns => 4MHz and no maximum value listed. So what i understand is that this driver can ... |
H: What is the advantages/disadvantages of the SMB connector against SMA?
I would like to connect an external UMTS antenna to the module, because of this I need a 15m long cable. The antenna has N-connector and I have to decide which connector should I put in the other side of the cable. I found only SMB connectors(Bu... |
H: Is there any restriction in the choice of Ethernet PHY, depending on the TCP/IP stack?
I am new on the forum and am currently working on a project to design an ethernet electronic board. I will have a microcontroller 32-bit with an external PHY.
I wanted to know : depending on the TCP/IP stack I will choose, will t... |
H: Fastest moving averaging techniques with minimum footprint
I have tried few running averaging techs for smoothing the change in ADC data in AtMega48 for controlling lights(PWM) when rotating a pot(ADC).
The filters (pseudo codes):
Moving average:
adc_avg += new adc_raw;
adc_avg >>= 1;
8-point Moving Average Fil... |
H: Amplifying Signal From Electret Microphone
My project requires me to use an electret microphone and I am having a lot of trouble getting any decent-sized signal out of it. I currently have it configured with a 100Kohm pullup resistor and a 47uF capacitor. The signal is so weak that even if I put it through an amp w... |
H: What is the usage of Zero Ohm & MiliOhm Resistor?
I am new to PCB design and I noticed that some schematics use 0Ω or 100mΩ resistors. What is their purpose and why do we need to use them in our PCB design?
Normally if we wish to probe how much current the load is taking, we put a jumper pin across the PCB trace (t... |
H: wiring LED's in parallel - need series resistor?
I would like to confirm something I have inferred through my looking into LED wiring and also have a couple questions answered. For the sake of the examples below assume the source voltage is 5v; my LED's drop 3.2v and want 20mA.
I am going to be wiring some LED's in... |
H: RS-232 and RS-485 software configurability?
I would like to connect a anemometer(RS-485, DB9) to the PC. The PC has a serial port with DB9 connector. I couldn't find the specification of the serial port. Is that RS-232 standard or RS-485? Most commonly used the RS-232, so I assume that is RS-232. Is there a possibi... |
H: Wrong voltage sent to output
Using miniLab1008, I am trying to send 10V to my D/A OUT0 but it sends only 5V and when I send 5V, I get 2.5V. I am using the universal library example VOut01.c
Is this a board problem? However using the software that came with the board everything seems normal.
AI: The user manual says... |
H: Orientaion Flat on Semiconductor Wafer
On semiconductor wafers there is a straight line, which is called Orientation Flat.
What exactly are these and how they are formed?
AI: As stevenh says one of the purposes is to ensure correct orientation during handling. The other reason is to indicate the crystal orientat... |
H: What is this resistor strip on my helicopter circuit?
RM: Smaller photo substituted - larger slower loading one here if desired:
https://i.stack.imgur.com/RPM8l.jpg
I am building a helicopter and would like to use a linear servo like the one on the right in this picture. The exact same servo has been removed fro... |
H: How to convert digital IO driving strength to dBm? Feeding an LVCMOS digital output into a spectrum analyzer
I have a spectrum analyzer that's primarily supposed to be used for RF measurements.
It lists an input limit of +30dBm max, and 0V DC, and has a 50Ohm impedance. My RF signal generator speaks the same langua... |
H: Calculate capacitance from cascade low pass filters
The task is to make a 2:degree filter with a slope of
40 dB/decade.
I have this circuit. R1=R2=10kΩ, f=1kHz
I also have this formula
What I think (probably wrong). Is that that because
40 dB/decade, then
I'm not quite sure that I have gotten the decibel convers... |
H: What is the physical meaning to the condition maximum efficiency in transformer?
Mathematically I can see that When Iron Loss = Copper loss there is maximum efficiency, But why is this true? As far as I know Iron losses are completely independent quantities, So I can't understand this condition intuitively. Please ... |
H: What is k variable on antenna theory
I make my text on bold so it distinguishes from the print-screens I post.
I am reading Antenna theory Analysis and Design, Balanis (Wiley 2016).
At page 17, (subsection 1.4 CURRENT DISTRIBUTION ON A THIN WIRE ANTENNA), I see \$sin(kl/2)\$, where \$k\$ is not explained. Is it a p... |
H: LHM6642 - Open Loop
I want to use LHM6642 as a comparator and I was wondering if it would work. The schematic that I have in mind is this one:
simulate this circuit – Schematic created using CircuitLab
In the input I will inject a PWM signal (2V High, 0V Low). Using the a resistor voltage divider, I biased the inv... |
H: How to regulate voltage from marine battery?
I have a telescope with a number of components that run on 12vdc.
I want to create some sort of power regulator to supply power to my components without frying anything. Is there some kind of voltage regulator i can put between the marine battery and my components to mak... |
H: What is meant by "monotonic reset"?
Can someone tell me what does it mean by Monotonic Reset? I read this below paragraph from this document and got this doubt.
A reset generator / voltage monitor is one option to provide a proper reset. Better yet, for increased design flexibility, a controllable reset (GPIO, ded... |
H: Wireless charging IC
I am building this wireless IC circuit and I don't understand the term HOST, TRI-STATE an BI-STATE. What do they mean?
AI: BI-State is simply a digital logic output with two states high and low.
Tri-State is a digital logic output with three states high, low and high-Z. High-Z is a passive outp... |
H: Media Independent Interface
I'm reading about the PHY, MAC and the MII interface.
I understand that the MDI interface from the RJ-45 to PHY will be 10Mbps, 100Mbps or even higher to 1Gbps.
But when this data signals move to the MAC, the MII clock speeds are 25MHz, RMII - 50MHz, GMII - 125MHz, RGMII - 125MHz and SGM... |
H: Characteristic impedance when routing differential
Can the characteristic impedance value of a single-ended transmissions line be omitted when the two transmissions lines of a differential pair are routed differentially (not two isolated lines)?
I ask this because up to now when dealing with a diff pair, I've alway... |
H: Design using 5x1 Mux, would this have any complications?
I am building a stopwatch with 5 counters. All are BCD counters with the exception of 1 modulo-6 counter (10ths, 1s, 10s, 1mins, 10mis.)
I intend to pass these to the 7 segment displays on my board. To do this I plan to serialize the 7 segment display's since... |
H: Altium route to plane
in the past I always used internal Signal layers, on which I created huge GND polygon planes as a ground plane.
However, there are actual solid planes definable in Altiums Layer Stackup Manager, which can be assigned a dedicated net.
So I assume, the proper way to define a ground plane is to d... |
H: Simplification down to a single resistor
How would you go about simplifying this circuit down to a single resistor? It’s Learning assesment E2.23 in "Basic engineering circuit analysis (Ed. 10 & 11)"
I have found out, that the current dosent just go down the path without the resistor, since it splits. But I don’t h... |
H: NPN BJT emitter current only from base
I'm working with a BC637 transistor. I want to deliver a 48 V, 2.5 mA signal to my load (diagram below.) I have the load connected through the emitter pin (19.2k Ω resistor.)
I was under the impression the collector-emitter current was supposed to be controlled by the equatio... |
H: Is it okay to charge a deeply discharged Li ion cell below 1V?
I accidentally discharge my lithium cell to 0.45V. Is is okay if I try to revive it by charging with 10mA of current till it reaches 2.5V?
cell capacity is 4000mAh.
AI: Throw it away. It's a huge safety risk.
Deep discharges that bring LiIon cells under... |
H: Why would this PCB design cause a short?
Yesterday, I designed my first ever PCB. It's meant to take data from several sensors and pass the data to a Raspberry Pi, which will in turn actuate pumps to control nutrient concentrations in a hydroponic system.
When I took this PCB to my professor, he said it would cause... |
H: What is the reason to connect 4 resistors of the same value as 2s2p? (image)
There are 2 parallel branches, each has 2x 10R resistor. It seems to me that the resulting value will be 10R, but I can't wrap my head around why would someone do this if it is not meant to dissipate power (it's meant to be a filter I beli... |
H: Power supply names
I'm studying and trying to understand Google developer board schematics, but there are a lot of redundant power supplies. This board is a carrier board when SOM is mounted. For example this:
This is a dual DC-DC converter with 3.3V and 1.8V outputs, but in the design there are 1.8V and 3.3V that... |
H: Non volatile memory on simple hardware board
I'm designing a low frequency board with some analog signals inputs and a few discrete logic gates which drive warning LEDs. I want to save the status of the LED even if the board is powered off. No microcontroller on the board is allowed.
The most common option to save ... |
H: Powering a device from an unknown circuit - voltage drops from 3.3 to 3.2. Is it overloaded?
I want to power an ESP8266 (wemos D1 Mini) directly off of a 3.3v power source provided by my garage door opener. This was never intended by the manufacturer, but it would be very convenient.
I observe that when I connect t... |
H: Is it ok for the one output of a dual-channel op-amp into an input of the other channel on the same IC?
So I have an LM358 op-amp with 2 (as far as I'm aware) separate channels. I need to increase gain but also need to have enough current to activate a diode. The problem is that the device (sensor) whose voltage I ... |
H: How to convert hydraulic pressure gauge into analog output?
Below is the pressure gauge of the heavy equipment. The pressure gauge needle is moved by a hydraulic pressure line.
We are looking to capture the hydraulic pressure into an IoT device that takes an analog voltage as input.
How do I convert the hydraulic p... |
H: IGBT operation failure at high current
I tried to use IGBT (skm400ga-12t4) to do fast current switching of circuits with an inductor.
The gate driver used adum4121-ARIZ and gate driving was performed by making a same circuit to the example in the data sheet.
Currently, one of the four IGBTs I have had was fine with... |
H: Temperature measurement in strong AC magnetic field
I have a coil that is continously driven with a maximum of 100A RMS of current at a frequency of 20kHz. The coil is water-cooled and I would like to directly monitor its temperature. The temperature sensor will be placed on the coil and will need to relay the sign... |
H: Feasibility of 30MW DC transmission over 400m?
We have an electric motor final load of 10-30MW, in an isolated industrial location.
The power source could be (Li-ion) battery packs, where each pack outputs 1500VDC, ~500A. Having 10-30 of these packs we get 10-30MW DC.
Can we efficiently transmit this over 200m-400m... |
H: How do shift registers work on the gate level?
I am trying to understand how a serial to parallel shift register works on the gate level. Where I want to shift/load a bit each clock cycle.
I found this schematic for a positive edge triggered D flip flop which works great. Trying to hook them up in series though, t... |
H: How to add harmonic distortions to guitar amp?
I was reading about the carver challenge,(https://www.stereophile.com/content/carver-challenge) and read that he had added a series of potentiometers to one of his amps that had allowed him to independently control each harmonic. I was wondering if this is possible to ... |
H: How to build boolean expression from these logic gates
I have these xor logic gates and I want to create a truth table from it. However I am having issue reading it from logic gate. Could anyone show me a minimal example how to convert this to a boolean expression?
AI: You provided a solution of your second example... |
H: Analog ground and pgnd in proteus
I am doing a project on proteus,I cannot find the ground terminal, where can I find AGND(Analog ground) and PGND in proteus?
AI: In the left hand menu of Proteus, go to the "Terminals" tab and you'll find the symbols for power, ground, input, output and others. connect this to your... |
H: Why TRIAC is not triggering?
I'm trying to trigger a TRIAC BTA16-800 using an MCO3021 optocoupler. I have a two-channel power supply, in one of them I'm pulsing the optocoupler at 120 Hz and the other channel is configured as a sinusoidal source of 24V amplitude and 60 Hz for power on the other side of the optocoup... |
H: Layout for MOSFETs (copper area for source vs drain)
I have a schematic. Here is a section of it:
The FETS are being driven by the chip to behave as ideal diodes. Plus two FETs in series to block current path when chip is in shut down stage.
I've seen most chips have the drain connected to the thermal pad and gene... |
H: Larger phase margin means less overshoot?
Why is it that the larger phase margin means the system has less overshoot?
I have heard that the larger phase margin means greater damping, but I don't how they are connected to each other. Could someone give a physical example that would show their relationship, like the... |
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