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H: What should I do with the unused Op-amp inputs?
I am building a simple inverting operational amplifier circuit where I am using a chip with dual amplifier. I am only using one of the two amplifiers. What should I do to the unused amplifier's input pins? Should I leave them floating or is there a good way to sort of... |
H: Mosfet to save power
I am making a battery powered project which involves bi-directional motor control. However motor needs to turn rarely (about 10-20 seconds in 24 hour period). I am using L298 motor driver. However the quiescent current is in mA range. To reduce current consumption, I am planning to use a mosfet... |
H: Control of a coreless DC motor using a PWM and a mosfet
I'm using 4 Si2302 logic level mosfets to drive 4 coreless dc motors. The speed of the motors is control led by the PWM signal from an Arduino Pro Mini. The power supply for the boards is a 3.7V (4.2V when fully-charged) 500mAh 50C Lipo.
The circuit is setup ... |
H: NFC - FPGA - TFT Question
Im working on an idea but am having a problem finding even a starting point for research.
The idea is to have images (video) sent over NFC to a NFC connected to FPGA (or something else could do?) and display those images to, let's say PSP TFT.
Any general ideas from where to start resear... |
H: Concerns in H-bridge switching times with common (one) gate control line
I have a FET based H-bridge being controlled by a micro. I was worried about software errors being able to turn on the top and bottom FETs at the same time, so I opted for the control scheme below for each half of the bridge. While this works ... |
H: LC circuit with AC-supply - current through the coil
A parallel LC-circuit is connected to an AC-supply as in the figure below.
\$I_{tot}(t)=I_0sin(\omega t+\phi)\$, \$\phi\$ is the phase angle between \$V_{tot}(t)\$ and \$I_{tot}(t)\$
a) Determine \$\phi\$.
b) What current \$I_L(t)\$(Amplitude and phase) runs ... |
H: can't read&store in global variable in function OR can, but get error reading ds18b20 sensor
I'm using Atmega8 with CVAVR 2.05.0 and trying to slightly modify the way ds18b20 library works. I want to store temperatures from sensors in global array and start conversion for all sensors at one time - so i can avoid us... |
H: A simple FIFO buffer in verilog
I have decided to implement a FIFO buffer in verilog (for fun). Here is my primary prototype you can say :
It will consist of a register bank or memory.
Each register will be of size N and there will be M such registers / shift registers.
The registers support serial write and seria... |
H: Autodesk Autocad for PCB design
I recently completed an Advanced Diploma level course subject for PCB design that taught Autocad as the design software.
Whilst I am aware of the power of Autocad my subsequent surveying of engineering firms has shown that none of them used Autocad and the majority 60% used Altium.
S... |
H: Low Voltage AC Smoothing Capacitor Calculation
I have a 9V AC source which will have a max load of 100mA. I'm trying to figure the value of a smoothing capacitor with less than a 10% ripple. I don't have a scope or else I'd just try a bunch out.
I'm just a hobbyist, but I'm trying to understand this. Since I'm n... |
H: Are drivers and libraries the same?
Can driver for some device (for example LCD display), also be called library (a set of functions for work with)? If not what is the difference, and what term is used for what?
AI: The term "library" is generally used for something that is written once, and used (or at least writt... |
H: Why do I have crosstalk in Arduino ADC, despite low source impedance?
I. THE CIRCUIT:
Below, an Arduino Due measures voltage signals from two parallel voltage-divider circuits:
We want the Due to accurately measure the voltages at the places where it makes contact with the voltage-dividers. However, we see signifi... |
H: Low current more susceptible to noise?
Supose I have an opamp with pnp input stage (constant current flowing out the input pin), like the following:
simulate this circuit – Schematic created using CircuitLab
Would the input from OA2 be susceptible to noise since the current flowing through it is low?
Could I 'fix'... |
H: RC-circuit - DE
Yesterday I was browsing through some questions in preparation for my exam and I found this one:
Consider the circuit below consisting out of a capacitor C and two identical resistors R. For \$t<0\$ the switch is open and the capacitor is uncharged. At \$t=0\$ switch is shut and the circuit is con... |
H: Why doesn't LTSpice predict this op-amp oscillation?
I'm developing a circuit to act as an electronic load for bench testing power supplies. An earlier question about how to test this circuit received several very useful answers and can be found here: How to test op amp stability?. This question is about how to int... |
H: How to quantify the health of an electronic appliance according to its power consumption?
Is there any ways to quantify the health of an electronic appliance according to its power consumption?
AI: Well, if the device is supposed to draw only 500mA, but it keeps blowing a 16A fuse in your house, then the device is ... |
H: Buck converter charge battery control output voltage
I have a buck converter charging 8 series of Li-Ion batteries ( 8 x 4.2 voltage of charging) with a source of 36 V. I am using this schematic (from here):
I know that for a resistive load, the output is controlled as
$$V_o=D V_{in}$$
But, here the load is not r... |
H: Function of undocumented pads on PCB mount power module
I'm hoping someone may be able to explain to me why are there extra pads on the bottom of APXW003 DC/DC SMPS PCB mount module from ProLynx series from GE Industrial. I am doing a design and it turns out cheaper for me to use these modules than to make a SMPS f... |
H: Altium: Rules and Query syntax
I want to set some rules for certain components. These rules are in the minimum solder mask sliver however I'm stuck on the query.
So far I've written IsDesignator = U7 but nothing seems to change and I'm still getting error for rule violation.
I'm not sure if my syntax is correct... |
H: How to smooth analog data?
I am trying to read load cells data, but these values are very fluctuating. I have ADS1230 ADC and I had configured it to the internal gain of 128. Four half-bridge load cells are connected in a bridge configuration and the output of bridge is fed into ADC. BUt there is no way i can get s... |
H: Why do RC applications use such a small PWM duty cycle?
I know that RC applications, such as a drone, use PWM signals to drive the motors. This PWM signal is mostly 50 Hz (0.02 s). The pulse itself varies from 1 ms to 2 ms. So a 1 ms pulse corresponds with a minimum motor rotation and a 2 ms pulse with a maximum mo... |
H: AVR Not Resetting Properly
I am facing an issue where my AVR is not resetting properly upon power up.This is the first time I am facing such issue.
I have a Nokia LCD connected to AVR and upon startup (and after some delay and after initializing the LCD display), the AVR is supposed to toggle an LED and then displa... |
H: Footprint election
I have to do a PCB and I have seen that the datasheet of some discrete component like microcontrollers indicate what footprint to use, but when I want to choose the footprint of a capacitor or resistor I have multiple choices which seem to be right.
I mean, for example, if I need a 1μF whith 0603... |
H: cheaper alternative to RPR359F Photosensor
We all love summer vacation but there comes a time when you get bored of your Xbox and decide to start off a new project to keep you busy.
Well this is what happened to me and I decided to build an Arduino controlled interactive LED table surface after watching a couple of... |
H: Will coiling a mains power electrical cord cause interference?
I am a maker working on a lamp design in which a decorative power cord is wound through the structure, creating a coil down the lamp's main structure. The coils are about 3cm apart and the same in diameter, and the power standard is 220V.
I'm pretty ce... |
H: Component Not Found VHDL XILINX ISE
i know this might be a very simple question .
i have to simulate some delays for various adders in ISE Suite . ( i'm a little familiar with vhdl concepts but ISE Environment , not at all ! )
this is the vhdl Code for Carry select adder :
library IEEE;
use IEEE.STD_LOGIC_1164.A... |
H: Eagle CAD: method of re-linking schematic and board?
I've accidentally lost the sync between my schematic and board, with Eagle CAD giving me the following error:
Board and schematic are not consistent!
No forward-/backannotation will be performed!
Is there a method of re-linking the two? I had very little wor... |
H: Why does my solid state relay not properly power a DC load?
I'm using a T108S02 to try to use a logical signal to turn on or off a small 3V DC toy. I'm not sure of the load current of the toy since my ammeter is not working.
When I activate the relay, my toy turns on, but appears to be running with limited load as ... |
H: Transfer function of a basic RC circuit
I'm having a hard time getting my head around finding the transfer function.
I have a circuit that looks like this:
o----------R-------C-----------o
|
|
C
|
... |
H: 555 Timer Min Max Expected Output Voltage Value
Could someone please tell me what are the min and max output values that should be expected from a 555 timer Output (pin 3) given X volts as the voltage source?
For example, assuming that the 555 timer is powered by 9 volts, what should the pin 3 voltage be when the p... |
H: Internal reference of MCU
The internal reference of the MCU is 1.45 V. I am relying on this to measure ambient temperature ratio-metrically using NTC and a resistor. The MCU datasheet says that the internal voltage reference can vary from 1.38 to 1.5. I am assuming that for the given instant, If I sample the 3 V su... |
H: Altium: PCB rule check violation errors
I'm not sure how to change the rules to satisfy the component constraints
AI: If you open up your PCB and Violations panel, you can see all your errors. Double click on one of the errors, and a pop up will appear. Jump to the error, so it fills the screen, and the highlight i... |
H: Burned Out Tantalum Capacitor Replacements
I have an old computer with a broken Miniscribe 8425SA hard disk. One of the capacitors has burned out, and need some help finding a replacement. Here are my questions:
It appears there are similar capacitors on the board which are marked "-A- 22uF 16V 89 2 8" (see pics... |
H: What is a purpose of BJT in an LED driver circuit with MOSFET?
I am trying to turn an LED on and off repeatedly with a square wave.
Yesterday, I've checked the following circuit works:
(Please note that, the figure has one voltage source Vdd. But I've connected a square wave source to the resistor Rg)
But, the mos... |
H: Is there a shortcut key in ModelSim so that part of the code I wrote will be turned to a comment:?
Is there a shortcut key in ModelSim so that part of the code I wrote will be turned to a comment?
Just like here, we use Ctrl + k. I wonder if there is also in ModelSim.
AI: Although I did not manage to find such a sh... |
H: Why are vias bad?
I am designing a PCB with EAGLE and saw that it was trying to limit the amount of vias through the PCB.
Why do you want less vias?
Why are they bad?
Do they bring extra manufacturing cost or is it OK for low-frequency
and low-power solutions?
AI: I think the main problem is: vias could occupy sig... |
H: How to adjust linear voltage regulator equivalent?
I'm attempting to build a linear voltage supply. (I'm not touching the mains yet.)
My first thought was to use an adjustable linear voltage regulator. Unfortunately, I found that linear voltage regulators have minimum load requirements as well as a reference voltag... |
H: What is the difference in assigning output before end process and after end process in VHDL
I have written a code to check the difference in assigning output before "end process" and after "end process" in VHDL. And the results of the simulation I have posted with it.
What I found is assigning output
1:After "e... |
H: Usefulness of VBW in spectrum analyzer
Typically in the block scheme of a spectrum analyzer a video filter, with a bandwidth VBW, is located after the envelope detector and before the screen.
As pointed out in this document, the VBW may (and sometimes should) be less than RBW (Resolution BandWidth, that is the band... |
H: Number of address in AT24C16 EEPROM or is it duplicate?
I am working on EEPROM AT24C16 for a particular project. According to the datasheet it must have 2048 addresses and I should be able to write 1024 unsigned int into it [ 1 unsigned int per 2 addresses] but I am only able to write 128 unsigned ints onto 256 add... |
H: VSSOP-8 Package Footprint
I am trying to create a footprint for a LMR61428 but the datasheet (linked) only has the package outline and nothing for the recommended land pattern, or footp for a PCB design.
I found this image on TI after a fair amount of searching for a VSSOP-8 package which is what the LMR61428 claim... |
H: Two 2.4GHz radio modules (XBee+Bluetooth) on same PCB. How to minimize interference?
I'm designing a PCB with XBee radio module and a bluetooth module (RFDuino SMD with XBee 2mW Radio). Since both of these modules are using 2.4GHz, are there any special consideration about how to place them on the PCB to minimize r... |
H: Can I make photodiode's voltage output bipolar?
I am trying to detect light with photodiode. Currently, I am planning to build a circuit like one of the followings:
Two circuits' output will swing between 0 to Vcc volts.
What I want is, I want to make an output swing -A to A volts.
For better understanding, please... |
H: What is the total resistance of a LED array?
First time poster and a hobby EE enthusiast here.
I want to turn on a LED array with a transistor switch and I'm having trouble with determining what will the total resistance on my transistor collector be. And without that I can't determine what should my base resistor ... |
H: SMD vs THR Transistor for Relay
Designing a Relay control from a MCU's GPIO, there are some requirements to take into account.
Coil Voltage: 3V
Coil Resistance: [36-45]Ohm
Relay Voltage: 250Vac // 30Vcc
GPIO Voltage: 3V3
Max GPIO Current 4mA // 20mA (depending on pin)
So, even when relay are THR, I'm looking for ... |
H: Yellow X in Eagle
I am trying to connect two points of my board with a bottom and top route, connected with a via. Whenever I link the two routes, a yellow x appears. Placing the via on top of the connection doesn't fix it.
How can I get rid of it?
AI: The via doesn't get the same ID as the route. You should try t... |
H: How to read capacitor code u10j63?
I need to find these capacitor immediately. How to read these values? I am pretty sure they are metalized polyester film capacitor. But I don't know what values they are? Capacitors look like this.
AI: As Rempelbekkie says, it is a 0.1µF, 63Volts, 5% tolerance capacitor.
In case y... |
H: When to use Battery Fuel gauge
I am designing a measuring instrument powered by a Li ion Cell, I need to display remaining battery capacity on it, so I was wondering what is good or lets say widely used method.
Should I use full fledged Battery fuel gauge IC instead of just measuring battery voltage to display rema... |
H: Automatically renumbering element parts in Eagle
I have a circuit in Eagle, and say that counting from left, I have R1, R2, R3, then between R1 and R2 I'm adding a new resistor, it will be named R4. I will end with (looking on the circuit) R1, R4, R2, R3.
It's not ordered.
I would like to keep elements ids (separa... |
H: Microphone connection diagram
I am trying to replicate project Jasper of raspberry pi. Currently I am using a USB to audio converter (shown in image below) and a regular PC mic. However the audio reception range is very small. So, I am planning to make my custom mic with opamp to amplify the sound signal.
This is t... |
H: How do I perform logical operations without a micro-controller?
I would like to build some (hopefully) simple logic circuits without the use of a microcontroller. I'm a software engineer primarily so I think of things slightly differently. To implement this with a microcontroller would be simple but I want to learn... |
H: Where and how do I put an inductor on a volume control
I built an stereo equalizer but I made some mistakes. As the potentiometers didn't fit on my PCB I had to put them separated and make the connections with some wires. The other mistake is that I made a virtual ground instead of a real one.
This mistake causes t... |
H: Difficulty understanding data over opto-diac
I'm having difficulty understanding the data over MOC3021, DIAC side.
Should I see it as with DB3? So DB3's \$V_{bo}\$ (28-36V) is the same in opto-diac, and DB3's \$V_o\$ (min 5V) is the same as MOC3021 \$V_{tm}\$ (typ 1.8V max 3V) and DB3's \$I_{trm}\$ (2A) is MOC3021... |
H: Sensitive or not sensitive gate?
If there is nothing about it in the datasheet, how can I find out if it is a sensitive or not sensitive gate?
AI: Simply look at the gate trigger current specification in the datasheet:
A "sensitive gate" triac will have a gate trigger current at 25°C in quadrants excluding IV tha... |
H: Driving IR LEDs using PWM - measuring current & current source questions
For a project I'm currently working on, we're trying to drive 940nm IR LEDs (Kingbright L-934-F3C) using PWM, regulated by an Arduino Uno. We've run into several issues during our prototyping process and could use some help!
We want to illumin... |
H: What does 125VAC mean on a small indicator bulb?
I have recently discovered a small box device that used to have an indicator bulb on it that would switch on when a switch was flicked. I am not sure what voltage to give the bulb, or if its AC or DC, though I assume it is AC because it says 125VAC. This is a picture... |
H: Input impedance of a non-inverting op-amp
From what I've read (and simulated), the feedback loop of an op-amp modifies the input impedance of the non-inverting input. The value specified in the datasheet is the open-loop input impedance, and the actual closed-loop input impedance will be some much larger number? ... |
H: method of locating schematic part on board layout?
In a design with a large number of parts it can be difficult to immediately pin-point a part's location on the board. Is there an easy method of finding a schematic part's location on the board layout?
AI: It's called 'cross-probing'. In Eagle open the schematic a... |
H: Why does a resistor in my Neopixel data line work at all?
Adafruit's best practices for their Neopixel LED strings say, "Place a 300 to 500 Ohm resistor between the Arduino data output pin and the input to the first NeoPixel."
Someone asked about the purpose of that resistor here and I'm reading about parasitic dio... |
H: Can a magnetic wire be used to extend/strengthen the signal coverage of a cellphone?
When i'm inside of our apartment, getting a cellphone signal is very hard, often times I wouldn't get any bar in my iPhone. My unit is in the ground floor and is surrounded by tall walls. My apartment has a small balcony (which is ... |
H: How bad is it to undervoltage a 12-volt lead-acid battery?
I had a heated discussion with a few colleagues today revolving around how low of a voltage was alright for 12 volt lead-acid battery; they were in the opinion that the low voltage warning buzzer and ultimate automatic shutoff was annoying and a safety risk... |
H: Safety/efficiency of a makeshift aluminium can heatsink?
I had recently received a 9v 1A DC wall-wart off eBay, and needed to open it to swap the polarity of the jack to center negative. As I had the case open, my finger bumped against the metal part of the TO-220 voltage regulator - on which there was no affixed h... |
H: Design Project via State Space
Design a state-variable feedback controller to yield a 20.8% overshoot and settling time of 4 seconds for a plant
$$G(s) = \frac{(s+4)}{(s+1)(s+2)(s+5)}$$
I am studying Design Project via State Space (Chapter 12 - Norman Nise - Control System Engineering) and I am very doubts about th... |
H: Fundamental property of an EM wave
Imagine there's an electromagnetic wave propagating in vacuum with a frequency \$f\$ and wavelength \$\lambda\$. Its speed is \$c\approx3\cdot10^8{{m}\over{s}}=f\cdot\lambda\$.
Now, the wave has to travel through a material with relative permittivity and permability \$\epsilon_r\$... |
H: Flexing Peltier Plate (Physical Question)
I am doing research into Peltier plates for a project, which requires a flexible component. From what I have found, no commercially made flexing Peltier plates seem to exist. My question is, what is the science behind this that inhibits flexing plates? Is it just a matter o... |
H: SSR selection - how is on resistance related to output IV curve?
I am looking at the datasheet at the link below, and I can't for the life of me figure out what I am missing.
http://www.digikey.ca/product-detail/en/TLP3542(F)/TLP3542F-ND/871299
This is a Toshiba SSR whose on resistance is 100mΩ maximum. There is an... |
H: Using Arduino + MOSFET to automate the pressing of button
I am working on using Arduino Uno to automate the pressing of buttons. The configuration to the left is the current configuration and it works fine. However, the configuration to the right doesn't. Could someone help with this matter?
P.S. I've tried using r... |
H: DAC interfacing with Atmega128
Hope you are doing well and solving all your problems!!!
I am new to hardware programming, facing some difficulties to work with DAC interfacing with Atmega128 board. After searching on internet, could not find any any good tutorial or explanation about ADC interfacing with AVR or Atm... |
H: Can I run two LED strips in parallel?
I'm considering bying this LED strip for better lighting around the bathroom mirror, but I'd like to cut it into 1/3 and 2/3 and arrange them in parallel. Is that possible with the given parts? Electrically I mean, physically I'm quite capable of soldering and mounting.
I ask b... |
H: What are values of fundamental frequency and the harmonics for the below signal g(t)?
We know that a Fourier series formula for any signal $s(t)$ is given as
$$\frac {a_0} 2 + \sum \limits _{m=1} ^\infty (a_m \cos \frac {2 \pi m t} T + b_m \sin \frac {2 \pi m t} T)$$
Here,as we see from the formula ,except the DC ... |
H: Wireless amplifier antenna
There is something like an antenna that works like an amplifier, repeating every signal in the device frequency operation range but wireless.
I mean that this "dumb" active antenna receive every protocol and retransmit all, and of course it need some power to do the job.
I know that speci... |
H: input of class E amp
i don't want to lose time on understanding it's theory, i just wanna know what kind of input does it take in, does it take a PWM input like the class D (the one below) ?
or just a ON/OFF signal with the frequency of the output and a duty cycle of 50% and a frequency near it's resonating frequ... |
H: can dropped voltage be greater than forward voltage?
What I know is:
forward voltage, Vf = The minimum voltage that is required to start current flow across the LED/Diode
dropped voltage, Vd = The voltage that is used/lost across the LED/Diode.
My question is, initially the equation should be Vf>Vd but can Vd>Vf be... |
H: Extracting and Using Sensor in Camera Assembly of Nokia Lumia 1020
I am trying to use the awesome camera sensor in the Nokia Lumia 1020 for research purposes. Unfortunately, my screen is broken so the screen is completely black. I intend to disassemble the phone, extract the camera assembly out of the phone, and us... |
H: analog error pcb
I am building a scale with a load cell and a INA122 equivalent circuit. When I build it in a breadboard I get very good readings but when I place it on the PCB I only get a -3.8V at the output of the INA122.
The circuit consists of an amplification stage with an equivalent circuit of the INA122, an... |
H: Resistors and capacitors calculation for 555 timer circuit
I am new to electronics and I want to try an experiment.
I want to use a 555 timer to create an automatic food dispenser for my aquarium (something like opening a small door when the timer has elapsed) and I need some help in timing here.
To have a confi... |
H: PCB stackup plane distance
What are the main reasons why one would choose one of the following options:
sig
(1") space
gnd
(4") space
pwr
(1") space
sig
comparing with
sig
(1") space
gnd
(1") space
sig/pwr
(1") space
sig
I know the impedance would be better controlled and the loopback would be smaller. But what... |
H: How do i turn multiple usb ports off based on multiple sensors
I'm looking for a way to turn a usb port on an off from an Arduino, I'm looking at purchasing something like this and somehow using a pressure or light sensor to turn the usb port on and off. I was thinking that I could use a transistor or relay to turn... |
H: Is it possible to combine multiple 5V USB batteries to power a Raspberry Pi for a long period of time (months)?
I need suggestions or help thinking this problem through. I want to battery power a Raspberry Pi with multiple USB battery packs (for a remote sensing application) with no need to do anything manually. S... |
H: Solving RC filter by differential equation
I'm trying to solve the differential equation of a simple RC filter. What i got so far is:
$$CRV'+V=V_0\sin(\omega t)$$
Solving i get:
$$V == \frac{V_0 \sin(\omega t)}{1 + R^2C^2 \omega^2} - \frac{RCV_0 \omega \cos(\omega t)}{1 + R^2C^2 \omega^2} +c_1e^{-\frac{t}{RC}}$$
... |
H: Reading and processing 32+ ADC channels at high frequencies
For a project I need to sample 32 or more photoresistors at a time and return an ID and value of the brightest photoresistor over some communication (i2c, serial, etc doesn't really matter to me). I am struggling with how to read so many ADCs at the same ... |
H: Why is my circuit so incredibly sensitive to electric fluctuation?
I recently finished building a circuit showcased in a beginner’s electronics book. I have included the picture of my creation below because I think it may become relevant to the question.
At the beginning of the build process, the instructions spec... |
H: How does this button work without any circuit closing device?
This may be a stupid question, but I have searched online for a little bit and can't seem to find my answer. I am working on a circuit board that uses buttons that i've never seen before. These buttons just have a metal lead around them and an LED in the... |
H: "DB" data directive explaination
What exactly is initialization of code memory IN 8051? Does the db directive command DB "SAM'' burn data into ROM location?
WHAT DOES INITIALIZING WITH A BYTE VALUE MEAN ?
I am all confused?
I am programming assembly in 8051!
AI: Yes, it literally puts those bytes into memory. T... |
H: How do I know current across unknown load if I know voltage
If I know voltage across a load, but don't know load resistance, how do I know current going through load?
Do I put a resistor of 1K and calculate?
My voltage is square wave so multimeter only get average current. I want current square wave
AI: Serial resi... |
H: Are capacitive display(s) capable of measuring what fraction of a finger is touched?
I'm really curious to get an answer for this question. Since I don't know the functioning of a capacitive display and Google didn't help me on this issue, I landed here. :)
Are capacitive displays used in most modern phones capabl... |
H: How to make arduino GPIO to operate at 3.3v instead of default 5v
I am working on a project, I use arduino mega 2560 with system operating voltage of 5v, at the same time I have a Bluetooth module which operates at 3.3v is there any way to reduce my arduino output voltage without any external component such as resi... |
H: Will (LiPo) batteries draw current/voltage between packs if main lead is disconnected?
Never learned this stuff in school (electrician study) oddly enough.
But if you serial up 4 batteries (3S LiPo's x4 to be specific), and you switch off the main leads to the power bank..
Will the batteries still draw/distribute l... |
H: Current sense driver feedback line
Is the current sense feedback dependent on how the driver is controlled, PWM or discrete signal.
Will the reading on ADC input differ when controlled by PWM, as we have a duty cycle?
For example if ADC sample rate is big enough is there a possibility we capture the 0 in the PWM pe... |
H: Any physical barrier to read an HDMI input?
I'm considering coding a software that would read data sent from a device (game console, computer, ...) via HDMI. The program would then be able to display the shared content inside a window, which would make it possible to use a laptop screen as a monitor. More info on w... |
H: Building NOT gate with transistor -- output remains always high
I'm following this tutorial to build a NOT-gate using a transistor (using slightly different parts).
The issue I'm seeing is the following: when no voltage is applied to the base of the transistor, then current flows, normally, through the path includi... |
H: Is it dangerous to use an ungrounded USB C charger to charge a laptop?
I have a laptop (with an aluminium case) that charges via USB C. The original power brick is 95W (but uses 60W charging in standard mode if I don't enable fast charging in software) and it has a standard CEE 7/7 plug.
When I travel or am in anot... |
H: what is the easiest way to make a gate that detects if something passes through a gap?
I have a home project with a device with an opening that is about 20cm (8 inches) wide. I want to attach two sensors on the sides of the opening, such that if an object passes between them, a switch is shorted (either momentarily... |
H: Question about setting the MPPT on BQ24650
I have a question about the MPPT in BQ24650 chip.
It has the MPPTSET pin that need to get 1.2v because the inside comparator.
According to the datasheet, on page 13 section 8.3.2, they say:
When the voltage sensed on the MPPSET pin drops below 1.2 V, the charger maintains... |
H: How do I find the Millman theorem in this op-amp circuit?
So I have this circuit and I want to find the millman theorem of it. I started with it and I got here.
I have E2 connected to the ground and E1 connected to a voltage source V1. So V+ = V1; and V- is where i got confused a little bit. So when I want to find ... |
H: What type of op-amp configuration is this?
If you need more info I will provide it. The op-amp board is piggybacked on an inverter driver board.
AI: This is a DC balance integrator for a full-bridge driver to null the DC offset, but it is prone to saturate unless it has large resistive feedback to limit the DC gai... |
H: How would I find the transfer function of this circuit?
I know that I can take the inductor and resistor and find the impedance from them in parallel. But what do I do with the resistor, R3? Do I need to do a nodal analysis and solve for the Vout? Or can I say that no current flows through R3 because the circuit i... |
H: Op-Amp current sense in H-Bridge
this is my first attempt ever at building an H bridge for brushed DC motors. The board is controlled externally with an Arduino that sends the EN and PWM signals. I also need to measure the motor current to do torque/current control.
For current sensing I decided to adopt low-side s... |
H: Is this MOSFET upside down?
I'm looking at existing circuits and trying to understand them so I can design my own. Also to improve my electronics knowledge, for some reason MOSFETs have never quite sunk in for me.
I came across the circuit for this board (the files from here (Rev D)) which the company are gracious ... |
H: Having issues with I2S with DMA using bare metal
I am trying to setup the I2S Peripheral to interact with the Pmod I2S module. The FW and SCLK are not generating, however I can see the MCLK on the oscilloscope.
Using the ST32H753ZI
What I have done so far are the following:
Setup the SPI1/I2S Clock
Enable the GPIO... |
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