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H: How to calculate power supply output current from its three phase input current
In my lab I have three-phase electric power according to the following diagram:
I'm using a three-phase power supply TRIO-PS-2G/3AC/24DC/40 which delivers 24V and max current 40A. Using a Current Clamp I measured the input current on e... |
H: Should there be keepout zones between ground pins and ground fill?
I have very limited PCB design experience. I've been using this program called Fritzing (it... has its pros and cons). Something I noticed is that when I do a ground fill with this software, it leaves copperless borders around ground pins except for... |
H: The input buffer of a Sample and Hold
In a Sample and Hold circuit, I know that the buffer amplifier after the capacitor keeps the capacitor from discharging because of its high impedance and causes the output voltage to be equal to the capacitor voltage.
But.. what is the function of the input buffer, why do we n... |
H: Why do we need to use transmission line theory?
I just started to learn transmission line theory. I'm still confused about a lot of things.
Every source says that we need to use transmission line theory when the length of the wire is 1/4 or longer than the wavelength of the sine wave; some sources use a different n... |
H: Is the LM399 Temperature coefficient with the heater on or off?
The LM399 datasheet specifies a temperature coefficient "\$\Delta\$T/\$\Delta\$Temp". The conditions state an ambient range but don't specify if that's with or without the heater on.
Which is it?
AI: If you read the Note 3:
"These specifications apply... |
H: How can a current be constant and there still be a voltage drop
I'm having trouble understanding how this can be possible. Obviously, I'm missing something but I'm not sure what it is.
The amount of voltage at a point depends on the electrical potential energy at that point, which depends on the density of charge (... |
H: Do I need Linux for UCB's SPICE(3)?
I have been reading a SMPS book with many simulated examples. I want to recreate the sims in the book and follow along with the shown examples. The author states that he uses SPICE for all examples, which I hear was developed at UCB a few decades ago. I already had LTSpice on my ... |
H: Identify temperature sensor in thermostat
I somehow managed to damage the temperature sensor in my thermostat while cleaning corroded battery contacts. Apparently the only fix is "buy a new thermostat", though it is a pity to replace this for a component worth a few pennies.
This is a "British Gas" branded RF-linke... |
H: Electric field in a circuit and potential drop
With reference to the above image:
Here the battery produces a constant (will it be constant? pl. explain) electric field across the length of the wire, lets say its value is \$\vec E\$ . This field exerts a force on the electrons in the wire and they start moving fro... |
H: Is a combinational logic circuit a Finite State Machine?
Is a combinational logic circuit a Finite State Machine?
In other words, is the class of combinational circuits a subset of the class of Finite state machines?
AI: EDIT: This answer is answering the original question, that was edited later: "Is combinatorial ... |
H: Will this work for power path?
My goal is to disconnect the battery while the device is connected to USB Input. However when the device is disconnected from USB power, the battery will be connected to the system load.
I am using back-to-back NMOS transistors with gate connected to USB power to turn on the lipo cha... |
H: Split one DC supply into 4 independent DC supplies
I want to take one DC source from a Rigol 832 and split that output into 4 adjustable, independent DC outputs that I can connect in series.
Is this possible? The goal is to make a circuit that will emulate a 4S battery pack where I can adjust each independent outp... |
H: Solder bridge pad spacing and scratch trace width
To save cost on a board I'm designing, I'm considering replacing an 8x2 male pin header intended for jumpers (which previously replaced an 8-position DIP switch) with 8 pairs of rectangular solder bridge pads.
My question is: How much of a gap should I leave between... |
H: Request for circuit review: varactor-tuned AM radio receiver
I apologize if this is not the place for newbie questions or circuit review requests, but I was hoping for some wisdom on an AM receiver circuit I have sketched out.
From left to right it is intended to read as tuner/demodulator/amplifier. Actual componen... |
H: Why does reactive power injection mitigate sagging grid voltage?
I understand that reactive power injection can be used by generators to support the grid voltage when sagging, but I’ve never understood why this works. I thought it could be charging transmission line capacitance or something, but I can’t make sense ... |
H: How can I add soldering holes, which are attached to IC pins, in Kicad?
I'm now almost done with a schematic in Kicad's Eeschema, but some links to the "outside world" are still missing, and I don't know yet how to add them to the schematic, so that they will appear as soldering holes in the PCB later. Here is the ... |
H: Designing a small footprint DC/DC converter
This is my first time diving into DC/DC converters, so I'm learning a lot of new information and am aware that I may miss some important details. I'm hoping that others with more experience could point out and educate me about those, why they are crucial, and what they ca... |
H: Why does a voltage divider linearize the effects of a non-linear thermistor?
I saw a design specification with an NTC thermistor in a voltage-divider configuration.
The design method said that we must have $$R_1=\sqrt{R_{NTC\min}R_{NTC\max}}$$ to produce a linear output voltage for a given range despite \$R_{NTC}\... |
H: Phase angle of induced voltage in transformer?
Why does the voltage induced in the secondary coil of a transformer lag 90 degrees from the flux in the core? The secondary voltage is induced when the flux cuts it, but then, why does the induced voltage in the secondary lag 90 degrees behind the flux?
What is the rea... |
H: How to (generally) identify a temperature sensor?
What should be the approach to figuring out what a temperature sensor is, when taking apart an appliance or “reverse engineering”?
This has come up in a couple scenarios for me recently:
I am installing an alternator controller, with a dedicated 2-lead temperature ... |
H: Why is mutual inductance coupling high in a microstrip PCB line?
I am learning about crosstalk on PCBs from the high-speed signal propagation book by Howard Johnson.
It says mutual inductance coupling is high in microstrip lines compared to mutual capacitive coupling.
Why it that?
AI: It is what it is. If the two t... |
H: Matching via sizes to trace widths
Let's say I've determined a trace width (\$t_w\$) for a trace, and now I want to determine the size of a via on that trace.
My intuition is that to maintain the same amount of copper as the trace through the via (and assuming the plating inside the hole has the same thickness as t... |
H: SMPS turning ON from earth flowing back into GND output
I've got a problem with a design using a SMPS.
The input is AC phase and neutral, one wire going through a power switch.
The output is 12V DC with the GND wired to the AC's earth.
The issue is that when the neutral (or phase) is cut OFF, the SMPS turns ON br... |
H: Identify Bobcat miner component
Today I tried to power up my helium bobcat miner with POE.
I used the TP-LINK POE10R PoE Splitter, but after 1 minute the miner turned off and didn't power up anymore...
I opened the miner and I discovered one component burned with the label "2132 BG". I have already searched for th... |
H: Breakdown voltage in diode and Zener diode, what are the practical differences?
Until now, I've only studied with diodes asuming they are ideal and I could tell the difference between normal diodes and Zener diodes. Now, I started to study non-ideal diodes and I see that this non-ideal diode has a breakdown voltage... |
H: Inductive coupling using earth ground instead of negative terminal in a power supply
I was a TA for an introductory EE class when I heard this comment. We would help students through basic lab exercises. Helping them troubleshoot, the students would sometimes use the ground connection instead of the negative termin... |
H: Derivation of Formula for Power
The power dissipated by a resistor can be written as $$V(t)I(t)$$ where both the voltage and current can vary with time. I don't understand why the formula is not
$$\frac{dW}{dt}=\frac{d}{dt} (Vq) = \frac{dV}{dt}q+\frac{dq}{dt}V=\frac{dV}{dt}q+VI$$
Where W is the work done by the res... |
H: Powering a RPI board with a 22V battery pack
I built a 22V battery pack with 6 18650 cells connected them to a 6s BMS. I will use this to power a portable audio amplifier.
I also want to use the same battery pack to power a Raspberry Pi Zero W embedded in the device.
According to the specs, the Zero W has a typical... |
H: Fixed emitter current or does it change after connecting collector?
The first picture shows the base current while the collector is disconnected. It shows 8.3 mA. While the second on shows the base current reduces a bit (maybe because of Early effect) and the collector current is about 374 mA.
As far as I knew, w... |
H: Which op-amp parameter indicates the minimum amplificable voltage?
I'm a newbie trying to measure μV-range voltages using cheap op-amps, with some software calibrations or error corrections, for education and practice.
At first, I looked at some op-amp datasheets and looked for parameters with their unit defined as... |
H: Where are the GPIO pins on Digilent Basys 3 FPGA Board?
I do not have a great understanding of electronics circuits and their fabrication. So please pardon me for the noob-ness of this post.
In one article that I am reading now, they have attached wires to 3.3V general-purpose I/O pins on the Digilent Basys 3 FPGA ... |
H: FET: How to understand noise specification?
I was reading an article about electret microphones and there was a link to a datasheet of the FET which was used for impedance matching. It is a popular Fet which is used in many electret microphones.
Here is the link to the datasheet:
http://www.openmusiclabs.com/wp/wp-... |
H: Why doesn't yaw calculating axis change after board reboot?
I have an MPU9250 on my board and I want to change the yaw calculating axis after reboot depending on how this board is placed, like this:
And I thought it would change if I reboot the board, but it doesn't. I'm not very good at this kind of math, but I r... |
H: Kicad ERC error #3: Power input pin not driven when attached to transistor
The ERC on my schematic keeps on failing due to a Type 3 error (VDD pin of an IC not driven) despite the fact that it does receive power via a voltage regulator and an NPN transistor. See the schematic attached:
Pin #2 is configuread as a +... |
H: TRS to USB microphone wiring
I am trying to use a microphone pulled out from an old video recorder. I can use a TRS connector and plug it into the AV - mic in jack. I am curious if there is a way to use USB - A interface.
In short is possible to map Out and GND to USB-A VCC,D-,D+,GND?
Will windows detect the device... |
H: Op-amp Colpitts oscillator
I have a question about op-amp Colpitts oscillators. I am a hobbyist building a sine wave oscillator circuit for an experiment.
The frequency of the output is one of the variables in the experiment so the actual value doesn't matter too much, but will be in the range of 10-100 kHz. I hav... |
H: Switching loss calculation formula
I read an article talking about the power switching loss formula, and I am curious about one thing.
How to use math to prove the 1/6 and 1/2 in these two waveforms? Could someone give me some idea?
AI: These expressions let you calculate the theoretical losses when a power switch... |
H: What is the name of a two-transistor touch sensor circuit?
I remember a circuit from back in my earlier days of playing with Arduinos and electronics that would light up an LED when two leads are touched with a poor conductor (e.g. a finger).
I don't remember the specifics, but I remember it involving almost nothin... |
H: Why did the output voltage of this circuit had the same value no matter what the value for the resistor R2 was
So here is the circuit:
R2 is a NTC thermistor (its value changes with temperature) and i want vout, the output of this circuit, to be in between 0.05V and 4.95V, where 0.05V should correspond to R2 with ... |
H: How do i make a circuit with 3 different counters that count 3 different things?
The system requires 3 counters
-one for the number of pills per bottle
-the number of bottles filled
-the total number of pills in the final bottles.
AI: Hint: You can use a set of 4017B counter ICs and logic gates ICs for testing cond... |
H: Mistake in using KVL and KCL in ideal opamp-circuit
I have the following circuit:
simulate this circuit – Schematic created using CircuitLab
And I used KCL and KVL to write the following sets of equations:
$$
\begin{cases}
\text{I}_0=\text{I}_1+\text{I}_2\\
\\
\text{I}_2=\text{I}_4+\text{I}_5\\
\\
\text{I}_7=\text... |
H: I am planning to design comparator based on Opamp but I am not getting the exact pulse output in LTspice
I am trying to simulate this but I am not getting the exact "RECTANGULR" pulse output. Kindly help me to figure out where I am going wrong.
I am going to use this circuit as pulse generator for gating MOSFET.... |
H: What is the best way to convert 16V DC to 4 V DC with close to 0 mA loss
I'm trying to power a Attiny2313A from 4V (which achieves the Voltage/Amperage ratio I want) but the power source I have to get 4V from, is 16V. So I'm wondering what some recommendations would be.
I have tried to do a voltage divider with rat... |
H: RISC-V: How do you store specific values in large addresses in Venus (RISC-V sim)?
I'm new to RISC-V and I'm having trouble understanding how one would store specific values in large addresses. For example, if I wanted to store the value 5 in 0x12312312, how would you go about that?
AI: It requires two steps. "Load... |
H: RF signal amplifier
I bought a tado smart thermostat but it has very bad signal. the transceiver often loses connection with the controls fitted to the radiators. i have tried various ways of pointing / positioning / angling it but the signal never reaches all thermostats.
It uses a 868 MHz frequency.
Is it possi... |
H: Is this "definition" of "independent loop" even logical / a valid definition?
I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 2.3 Nodes, Branches, and Loops says the following:
A branch represents a single element such as a voltag... |
H: Do I need to switch power and ground on USB 3.0?
I am an electronics novice, so before I start cutting my cable, I want to ask people who know more than me. I have a project that has a USB 3.0 hub inside, and I want a single switch to handle the DC power and the USB connection to the computer. I saw a video of some... |
H: Case temperature MOSFET
I am going to use a nMOSFET (NTMFS5C670NL) which will a varied power dissipation. The current going from drain to source is determined by a control signal. The maximum power dissipation for the MOSFET is 1.29 W.
The junction-to-case thermal resistance Rjc is 2.4 ℃/W, and the junction-to-ambi... |
H: CMOS active crystal oscillator load capacitance, to be used for PLL reference
I do not have a clear idea of what load capacitance is. I am looking forward to use the ADF4106 PLL with a ~580 MHz VCO to synthesize the frequency.
For the reference input to the PLL, I wanted to simply use a CMOS active crystal oscillat... |
H: Correcting MOSFET gate voltage
I'm working on a project where a IRL520N controls some LEDs but I ran into a problem. In order to activate the MOSFET I'm using a microcontroller with an output of 5 V, but the datasheet says that the gate threshold voltage must be between 2-4 volts.
So I wondered: would putting a 200... |
H: Tesla coil with flyback transformer and ZVS circuit
I am new to the field of electronics and I might have some wrong concepts.
I was thinking of designing an old fashioned 'spark gap' Tesla coil.
Materials I have:
a flyback transformer
a cheap ZVS circuit
a cardboard tube of dimensions - 3.5 in * 19.5 in
If I wan... |
H: Unexpected voltage drop in linear dual supply power regulator
I am attempting to implement a linear dual power regulator circuit using the 7805 and the 7905, as shown below.
It almost works, except that the voltage difference from the ground rail to the positive rail sits at around 4.73 volts instead of the expecte... |
H: How do I properly interpret identification on opto-isolator IC?
Lightning struck near my house and destroyed a bunch of things I had plugged in, including a treadmill. I swapped parts with another one and identified that it's the lower motor control board that is the problem and on it I see an opto-isolator that h... |
H: Can a 12 V LED dimmer be used with a 6 V incandescent load?
Can a 12 V LED dimmer be used with a 6 V incandescent load?
I'd be interested in knowing what factors make such an arrangement suitable or unsuitable.
Specific example: I bought a 12 V, 60 W Dimmer Box because it was reduced to $5.00 and I thought I might ... |
H: AL5873QT16E-13 LED driver
I have a requirement wherein strings of LEDs need to be driven with a maximum forward current of 250 mA, and the dimming should be analog, not PWM.
I have chosen AL5873QT16E-13 which has 3 channels that can independently regulate up to 250 mA each. If I have 5 V as Vin can I only connect 1... |
H: Which components can be labelled as "BD" on a printed circuit board?
In the process of repairing some consumer electronics, I encountered some SMDs labelled BD on the silkscreen:
As this one has clearly blown, I'm interested in knowing what it could be.
Here is another component on the board, having the same label... |
H: I don't know why UCC27324 getting hot in normal condition
I have some question about UCC27324P MOSFET driver.
I have experiment using UCC27324D (8-DIP type) and UCC27324P (SMD type) via this circuit.
DIP type driver works fine with no problem same condition.
But SMD type driver when 3.3 V PWM signal engaged, temper... |
H: Optimal LDA210 optocoupler circuit for mains detection
I am trying to sense mains with an ESP32. For that I plan to use this circuit:
I want to optimize the resistors from If current in order to lower the power (W) they use so they don't get hot.
According to the datasheet (page 43), the ESP32 has 45kΩ pull up res... |
H: Skim excess power from a resonant circuit without draining it?
If you have a resonant circuit, oscillating at its self-resonant frequency, how would you extract the excess power without draining it fully? A high Q resonant transformer impedance matched to the circuit perhaps? Is there another way? I actually need D... |
H: What are these connector threaded standoffs called?
These threaded standoffs are used on DB connectors and seem to be flared onto the connector flange. They are used to secure two mating connectors together.
What are they called? What kind of tool is used to install them onto the connector?
AI: The magic search wor... |
H: What is the difference between these soldering tips?
What's the difference between both the tips? I know one is copper while the other isn't. What is the benefit of one over the other and has anyone purchased the copper bit before? What's your experience?
AI: Solder dissolves copper to a small extent.
You'll never ... |
H: Simulation Error in Circuit Lab with 2 Dependent Sources
simulate this circuit – Schematic created using CircuitLab
I'm practicing some problems and came across this circuit. It asks for the Thevenin equivalent with respect to terminals A and B. I solved it by hand and have the correct answer and also verified i... |
H: How do I prevent all valves to activate when a single curcuit activates?
I'm setting up a watering system in my greenhouse. This is a 12v DC system.
I have three timers, each controling its own solenoid valve + a shared water pump.
How do I prevent current from going to the other two valves when a single timer (and... |
H: What exactly are IBIS simulation models? Can I use them like a normal simulation component?
I read a lot about IBIS. "What I understood is that they basically model the input and output voltage and current data based on actual performance instead of describing them through equations like in SPICE. Please correct m... |
H: Altium schematic "snap grid" vs "snap distance"
Could anyone give me a practical example of what is the "Snap Distance" on the Altium Schematic? I read the below but when I place a component I can't see any difference in movement when I change the value of the "Snap Distance."
Only if I change the "Snap Grid" value... |
H: Should I use servos or stepper motors in a homebrew plotter?
I'm making a plotter for drawing pcb designs on copper clad board.
I'm planning on using rails from a 3D printer for the 2D drawing plane and smaller vertical rails to raise and lower one of 4 pen holders.
The thinnest pen I'm using is 0.2mm, so that's th... |
H: IC with SDCard and LVDS interfaces for video playback, what are they called?
I am looking to build a board that can connect to an LVDS LCD screen and play back videos from an SD card when triggered via a serial port command, or I2C, or similar. I have seen cards like that on the market, but can't find any ICs with ... |
H: Current meter doesn't short a circuit?
I have a control card where two pins can be shorted with a push button to trigger an action (5V can be measured between the two pins.)
If I briefly short the pins with a jumper, the action is triggered as expected
If I short the pins with a current-meter: nothing happens. By ... |
H: Reverse voltage for diode in three phase circuit?
I'm trying to understand what happens when a diode is not conducting in this circuit, more specifically, what's the reverse voltage applied to it?
I know only one diode will be working at a time, but what about the other two diodes?
If D1 is ON, and I assume 0.7v d... |
H: How to explain the strange results from this circuit (op-amp : differential amplifier?)
I have a differential amplifier. Problem of "gain" of the op-amp or "how it is wired."
I have simulated this as a voltage source controlled voltage (VofV.)
As a generic amplifer.
As a good old LM741C.
Very strange behavior whe... |
H: splitting ground plane
I have a 4 layer board, where I have a 3.3V STM32 and some 3.3V components, and also a 24V H bridge to drive a 24V DC motor. The board is supplied with a 24V DC power supply, the 3.3V is created by a regulator on the board. I split the power plane accordingly, like this:
You can see where th... |
H: I need to implement DC and transient analysis of diode and transistor circuits. How can I do that?
I am doing a MATLAB project at my university.
I have tried to implement DC and transient analysis of diode and transistor circuits by linearizing them and using iterative methods, but the results don't converge.
How d... |
H: How do I compute the angular resolution of a radar system?
I hope this is the right place to ask a radar related question, otherwise I would be grateful for a pointer to the correct forum.
I want to compute the angular resolution of a radar system but so far I have found different formulas and I am not sure which o... |
H: What does 'rotating vector addition' mean in this context, and how does it generate AM and FM?
I am currently learning about wave modulation. In communication theory, it is said that 'rotating vector addition' generates AM (amplitude modulation) and FM (frequency modulation). What does 'rotating vector addition' me... |
H: How does relative permittivity change at high frequency?
I am trying to design RF radar optics for 60GHz. However, I do not know how 'constant' the relative permittivity of a substance is.
One material I am making an RF lens out of is PEEK which measures the er at 1MHz (link to datasheet below.)
My question is in ... |
H: Why is the output not zero for zero differential input?
To start with, I am simulating a StrongARM latch. Surprisingly, the circuit is not giving a zero output for zero differential input.
In the circuit, one clock cycle is 2 ns and VDD is 1.8 V.
The MOSFET model used was BSIM3, HSPICE level 49, 180 nm technology.
... |
H: Is there a manual in English for the UYIGAO UA6013L Digital Capacitance Meter?
The UYIGAO UA6013L meter I ordered arrived with an instruction manual in Chinese. I have been unable to obtain a manual in English for this device from the seller or locate one online.
Does anyone know if an English manual for this devic... |
H: What is systematic offset?
I am bit confused about what exactly systematic offset is. I understood that generally offset could be due to two reasons:
Random offset which could be due to mismatch in size of transistors or any other component. This will be like noise with mean zero.
Systematic?
It would be great ... |
H: Why do silicon wafers look rainbow colored?
. Image taken from Can somebody identify this 12" silicon wafer?
So this silicon wafer looks multicolored (and beautiful). But how does it get multicolored like a rainbow? What is the reason for this phenomenon?
AI: If it's an old image or an image of any wafer made by a ... |
H: Is it possible to use single power supply for both op amp bias and powering the mic?
Question as in the title.
Can Vcc from identical source be used both for the op amp bias and powering the mic?
AI: C5,C6,C7 are filtering the bias supply to the microphone so it should be fine to use the same supply for both purpo... |
H: How to display my date in the 2nd line of the LCD?
Below are the codes I using to display dates and times and basically I used the function "write(hr1,hr0,min1,min0,sec1,sec0);" to display the time and "day_compute(day);" to display what the day for the input date. For simplicity, I just show the input send to LCD ... |
H: Choose a varistor for a broken PC PSU
My computer's PSU (Corsair RM 650X) has blown.
I've searched a bit online and I have found that this is a common defect due to a low quality varistor put in those kind of PSUs before 2018.
I know this is delicate stuff to handle so after a few months (I am using in the PC anoth... |
H: MOSFET simulation using LTspice
MOSFET, Im having some problem in the simulation for the input and output circuit, what I get was always a straight line
AI: You should really take some notes, or follow some tutorials on basic SPICE usage. You'd see then that the source, as you have it, is not set up properly for... |
H: Confusion in proportional controller
I was revising proportional controller from here
and got confused in following figure which is common in many books also.
Since output of controller is proportional(by factor K) to error function but error function and output of plant have same unit(otherwise substraction not ... |
H: How does power factor show itself in this data from sensor readings?
Suppose I have a single phase system and I have a sensor attached to to measure both voltage and current. The sensor samples for 50 kHz and the data is saved to a file.
When we then graph out the file we get something like this:
In the beer analo... |
H: Noise Figure of an Attenuator
it is known that the noise figure of an attenuator is equal to its attenuation coefficient L. A proof of this statement is provided here.
Basically, it uses the formula (Reference):
$$F = 1 + \frac{N_a}{GN_i}$$
for a general block with gain G (equal to 1/L in case of an attenuator), wh... |
H: Why are low values of resistor in non-inverting configuration of opamp causing gain peaking?
I am trying to simulate frequency response of TLV07 in non-inverting configuration for gain 10 as shown below:
The frequency response shows peaking as shown below:
It is worse for smaller values of resistors like 1 and 10... |
H: Simplest circuit to toggle through 3 colours on RGB LED
I would like to make a bracelet that has a coin cell battery, a button, some super simple logic, and an RGB LED. I'd like for the user to be able to toggle through the LED being lit green, yellow, red, and off. I know I could do it using a decade counter and m... |
H: 232RL as COM port: Recognize the device on commercial product - from the software's perspective
I am making a device that uses 232RL to translate from UART to USB and windows see a COM port. The connections are like so:
simulate this circuit – Schematic created using CircuitLab
I want to find a way so that when th... |
H: How many instructions can a vector processor issue per cycle?
I currently have vector processors in class and wondered whether a vector processor only issues one (vector) instruction per cycle (in order processor). Maybe this question is stupid and it depends solely on the individual processor, however, it would ... |
H: Propagation and contamination delays with different delays for rising and falling edges
In the Digital Design and Computer Architecture by David Harris, Sarah Harris the authors explain what are propagation delay and contamination delay in the following way:
The propagation delay \$t_{pd}\$ is the maximum time fro... |
H: Please help me clear up this confusion regarding gain margin and phase margin and unity feedback
I understand the physical significance of gain and phase margin. However, I would like some clarification regarding the mathematical aspects. Videos such as the following:
https://www.youtube.com/watch?v=ThoA4amCAX4 (t... |
H: Input image format to Verilog
I'm working on image processing using FPGA. My aim is to begin by performing basic image processing such as brightness control, conversion to gray scale and then later on, advance to implement the other functions as well.
In what form is it preferable to give the input image (.bmp, .bi... |
H: What is the purpose of this extra capacitor in a notch filter?
I understand notch filters, I can write transfer functions and draw Bode diagrams to see how they work. As far as I know, the notch filter only has: C1, C2, C3, R1, R2, R3.
The schematic I have here includes:
C1 = C2 = 0.05uF
C3 = 0.1 uF
R1 = R2 = 40k ... |
H: ohm's law and power equation
I have a question about electricity. I know that transmitting power over long distances is better in AC. I also heard that the voltage needs to be high to reduce losses. I want to calculate this for myself.
Imagine, there is a windmill that produces 100 kW of power. This 100 kW needs to... |
H: Does putting magnetic sensor in a metal housing affect performance of the sensor?
I'm putting IMU sensor to read earth-magnetic field. Does metal housing affect it?
It might be basic question, but I lack experience in this exact scenario. (My device needs a bit of a reliability, so I'm asking this)
Currently, metal... |
H: Voltage divider. Very Basic Question
So in this basic voltge divider in order calculate \$U_4\$ I wrote \$U_4/U = R_A/R\$ .
However looking the correct expression is \$U_4/U= R_A/R_B\$.
While I see the second is correct, I dont see why mine is not... How should I properly think about this in order to always write ... |
H: Why is the noise gain these opamps 500? I feel it should be 250
I wanted to check the bandwidth of the first stage of an instrumentation amplifier configuration and this is the circuit:
Since, the noise gain of an opamp is (1+Rf/R1), for each of the op-amps the noise gain should be 250. The GBW of the opamps is 1M... |
H: How much voltage is too much for an LED?
I have an amplitude modulation LED driver (a dimmable constant current reduction LED driver.) It can power an LED up to 30W, 750mA, 6-40V. The LED I am connecting is good for 750mA, 12V. Will it be too much voltage?
I hear people say too much current will kill the LED and wa... |
H: USB-C and >5V Power Supply
I have a question about power supplies and Power Delivery on USB-C. I'm trying to understand the USB-C specification, Power Delivery, UFP and DFP, DRP... but this is a nightmare. There are not clarifying examples on the USB-C Specification, only a ton of schemes with 1200 configurations w... |
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