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H: calculate input resistance with known adc value
I am fairly new in the electronics world, but I would really like to learn it. The problem I'm facing right now, is that I miss the insight to be able to tackle this specific problem.
I have to calculate the input resistance of a system on the basis of a given ADC val... |
H: Are ripples and harmonics the same thing?
I started working on the "Direct Power Control of Grid Connected Voltage Source Converters", everywhere in the literature, authors state that one of the major drawbacks of this control technique is the presence of active and reactive power ripples due to the use of Hysteres... |
H: Finding the number of bytes written in a larger array
How can I read the total number of the bytes written into a larger array?
For example if 10 bytes are written in a uint8_t array[100], how can I check if the written bytes are 10 and not 20 or 80 or 100
Since sizeof(array) would give us the total number of the ... |
H: Thermal parameters for the LM1117
Looking at the datasheet for the LM1117 regulator, on page 18 to 20 there's a table of various layouts for copper cooling planes for the LM1117 in SOT-223 and TO-252 packages. Comparing figures 30 and 31 to table 2, I see a number of discrepancies:
for layout 6, the one with the l... |
H: Difference B/w LTxxx Ics and Lmvxx Ics
I have been strolling towards being a circuit designer, using eagle and ltspice and i am trying to learn about new ic's and stuff. recently the thought about how does an LTXXX module and LVXXX(or LMXX) module differ to each other if they are both based on op-amps.
AI: There mi... |
H: Line splitter for 230VAC in the UK?
In the U.S. where I am from, my company's field techs are required to measure AC wall current of our products frequently. To to this, they either make their own harness with a Hot (Line) wire to clamp on to or they opt to use a commercial line splitter like this:
The problem is... |
H: How much protection is an IC socket?
I read that if you try to solder an IC directly to a PCB, the heat from the soldering iron tends to destroy the delicate IC — unless you have elite-level soldering skills. (Hint: I do not have such skills!)
For my current project, my plan was to solder IC sockets to the board, d... |
H: Calculating laptop power consumption
I'm trying to decide on a portable AC power station to power four laptops for at least five hours. I have the charger units for the laptops, and I'm confused on how to figure out the power consumption from them. Mainly, I don't know whether to look at the input power from the AC... |
H: Circuit for squaring (raise to power 2) signal
I have a voltage signal and I want to design a circuit that can do squaring of this signal ( raise it to power 2).
For example when I read the output, instead of having 2 V I get 2^2= 4 V.
Is there a way to achieve that?
Thanks
AI: Use an analogue multiplierr (basicall... |
H: Using mesh analysis to get the transfer function of electrical system
I am studying the book: Control system engineering for Norman S Nise.
I left the college few years ago, and I forgot lots of thing about Kirchhof's laws (Voltage and current).
I tried to solve the following exercise:
PROBLEM: Given the network ... |
H: Controlling motor speed with PID how to scale PWM to RPM and back
I want to control the speed of a motor using PID controller. My problem is, the valid PWM range I can set in my microcontroller is from 0 to 199 but I measure the speed of the motor (using an encoder) in range of ~50 to 6000 RPM.
How can I meaningful... |
H: How to calculate closed-loop bandwidth from open-loop parameters using feedback factor
I'm working through a past feedback analysis question for an exam and trying to calculate what the closed-loop bandwidth becomes given the open-loop gain \$|Av|=10^5\$, open-loop bandwidth \$B_{wo} = 20 \text{ Hz}\$ and a calcula... |
H: Slightly Translated Parallel Electrical Circuit Analysis
My apologies for the vague title, but I simply do not not how else I could express it. As I was studying for my physics electrical exam, I found nodal analysis quite useful; however, I do not know how to apply nodal analysis to further simplify the following ... |
H: Choosing toroid for FM dipole choke
After several failed attempts to buy simple rabbit ears for FM tuner I decided to make my own. Now, I have zero knowledge in RF circuits. While finding the formulas for pole length wasn't hard, I could not find much on toroid chokes. Or rather, I found too much of it.
So, I decid... |
H: Battery Tester Circuit with 3 LEDS
I'm designing a small system that uses an ATMEGA328P and a LoRa module that runs on 3.3V using a AAA 1.5V battery. The battery is connected to a Boost Converter which steps up the 1.5V to 3.3V to power the entire system. So obviously the whole system needs to have a low power cons... |
H: Reuse/distribution of signals
I have a newbie-question.
I have a design for a circuit, but before I design and order PCB and assemble it I'd like to double-check whether or not some assumptions are correct.
The circuit uses 3 signals to control some ICs; since most of them are to receive the same signal I simply wi... |
H: Programmable Melody chips
Is there a component, (that is not Raspberry Pi or other mini computer it would be too costly for my purpose), comparable to simple melody chips like UM66 or BT66 But programmable in nature, so that I can use to play a MIDI music file on loop? Preferably suggest me a circuit diagram to do ... |
H: So there was an ant that somehow got inside my screen. How do I remove it?
Wondering if it's possible to remove the LCD screen without damaging it.
I noticed there are six black metal thingys at the back of the module that is twisted up holding the LCD in-place, is it safe to untwist and remove it? What do I have ... |
H: Cheap load cell and ADS1232 strange oscillation
I'm using four of these load cells wired in parallel and connected to an ADS1232. Overall the device (scale) is working well, but I am seeing a strange signal over a period of a few minutes after I turn the scale on. I have the ADS1232 hooked as in this schematic:
I ... |
H: VHDL to RTL/schematic, not what I expect to see
I'm teaching myself VHDL (using Altera Quartus Prime Web Edition) so we can incoroprate a CPLD into a design. I've only been doing it a few days but so far the VHDL itself seems reasonably straightforward. I've learnt how to design entities and use multiple instances ... |
H: Why does an SMPS use LCR on INPUT?
I have this 5 V output SMPS I bought a while ago. I was wondering why there are LCRs connected to the input of my SMPS. I don't understand why it's there.
BTW, I'm an electrical engineering student, and I know the basics of LCR, but I am not sure what it's doing here.
AI: The yell... |
H: Buck Converter Max Current
How do you work out the maximum current a buck converter can handle at different voltage outputs? The one I am looking at specifies :
300W 12A Adjustable CC CV Step Down Buck Converter 7-32V To 0.8-28V Power Supply
Non-isolated step-down module, constant current and constant voltage modu... |
H: 20kHz PWM on Arduino
The datasheet of the ST VNH5050A-E H-bridge motor driver says it can take PWM up to 20kHz. Then, on page 10 of the datasheet, it says PWM = 20 kHz in the supply current parameter. Does this mean that the PWM frequency has to be 20kHz or, as it says in the description, it can be up to 20kHz?
Ard... |
H: When Pin diode is no longer junction?
For p-i-n junction with intrinsic region d, I need to answer what happens when d is very large.
So from simple logic, I believe that at some point there will be no diffusion of charge carriers from p-type to n-type and reverse and I guess that these relate to diffusion length, ... |
H: Looking for a component that lets me choose where to draw power from
I would like to have a switch or box that allows me to plug a battery and wall power into the box, and then has a switch that chooses which power to use for the output.
The ideal inputs of the box are a 12v battery and 120v AC wall plug, and the ... |
H: Import step model into HFSS
I have a step file and I want to simulate it in HFSS but it seams that the structure it is not made with solids, but with attached sheets because when I import it in HFSS I cannot define materials and everything is under sheet.
Do you know a way to convert it in a 3D model to be able to ... |
H: Strange behaviour of ne555 + pmosfet circuit
I was a silent reader for a long time and could solve all the problems on my own, but this problem is really freaking me out.
I was messing around until 3 AM today with this "feature" and still don't know what is going on...
Initial Situation
There is a LED strip, that i... |
H: Why is it recommended to not use a device while charging? How does it harm the battery or the device?
I was planning on getting the new VR headset from Oculus, dubbed Oculus GO.
The battery life of that thing is roughly 3 hours max. So, during long VR sessions, powering the headset via a power bank seems to be a g... |
H: Solar powered water pump - need some advice
I am completely new to elecrical engineering, but I want to give it a shot and am really interested in learning more details about how all of it works. I've had an advanced physics course in high school, but that's about it, so please bear with me while I'm trying to get ... |
H: PCB Techniques for RF Circuits
Following this Linear Technology (Analog.com) Application Note AN47FA (1991), I found these kind of RF PCBs, among many others, very similar (fig.32 p.18 and Fig.F10 p.107).
(The images are in B&W because of some aestetics for the document.)
Putting aside that these are actually sin... |
H: VBIC Mextram Transistor Spice Models Parametrization
Under LTSpice, for the VBIC (level=4 or level=9) and MEXTRAM (level=504) Bipolar Transistor Options, as some people pointed me, I dont know how to simulate an e.g. 2N3904 under VBIC or MEXTRAM?
The single reference, suggested by Dietmar Warning (if he is the real... |
H: Move 7 segment display off board, how?
I bought a relay that has a 7 segment display on it.
It's placed "incorrectly" according to what I need so I want to move it off the board as simple as possible. (Because I'm not that good at this).
So lifting off the 7 segment I see this two rows of connections that I figur... |
H: How much can I draw from the output of a flip flop?
I have a simple question. I'm looking at using http://www.ti.com/lit/ds/symlink/cd4013b.pdf for my project and I need to be able to draw ~500ma from the 'Q' or '!Q' pin on the flipflop. How much current can I draw? I looked at the datasheet and couldn't find th... |
H: How to connect Multiple JTAG devices?
Currently I am working on FPGA design which uses trace32 to interact with jtag devices. Since there are more than once JTAG device in the design we are using parellel (not daisy chain) approach from JTAG controller to select a spefic device.
Are we doing it right? Or daisy chai... |
H: Removing QFN Lead Frame From PCB
We have some PCBs that were designed to drive high-power ultrasound transducers. There was an issue with the boards early on that resulted in several of them blowing diodes.
I have since fixed the issue on the remaining boards and am trying to repair the dead boards to solder on som... |
H: Can someone double check my resistor identification?
I have a resistor I need to replace. It is fairly large measuring 11mm long with 4mm diameter. All of the hobby resistors I have are 1/4 watt and make this thing look gigantic.
Do you think it is a 1 watt, or is there some larger value it could be?
I am also at... |
H: LT3083 heat dissipation
I was looking through a datasheet for the LT3083 regulator and in the typical applications sections this caught my eye:
Provided input/output ratings could easily lead to over 20W being dissipated on the second regulator. I'm looking for some ballpark figures on the required heatsinking (i.... |
H: How to read pinout of this SPDT relay G8N-1F
Introduction:
The direction indicators of the car (Honda FR-V) are not working anymore. I managed to get the ICU (integrated control unit) out of the fuse box beneath the steering wheel. Hell of a job in such confined space. There are 2 relays of which I think 2 are for ... |
H: Can this circuit work as an UHF oscillator?
This circuit is intended to produce frequencies between 3Hz and 1.5GHz, given the response frequency of the P2N2222A, which is 350MHz.
Here's how I think this circuit works:
While the capacitor C6 is charging through Q1's base, the transistor is conductive; when the cap... |
H: Ground Plane Net Tie - Question about current design
I am doing net-tie method to separate two different Ground Planes (for noise mitigation purpose), one ground plane is for RF circuitry and MCU, the other ground plane is for power and motor switching. I wonder if this is a good way of laying out net-tie
Here is ... |
H: How much current is drawn by an 18,600 BTU A/C compressor during free run?
I recently got an old hermetic A/C compressor. I plan to use this as a vacuum pump mostly for some of my hobby projects. The specs on the label on the A/C said that it power draw is 2450 Watts, 11.5Amps.
Does it mean that the current draw is... |
H: Problems with a non-inverting op amp configuration when input voltage is too low
I currently have a very simple op amp circuit for a non-inverting amplifier, using a UA741 with the gain set as 2. I have a sensor that outputs 0-2.3V and I'm attempting to amplify it up to 0-4.6V. The set up for the op amp is below.... |
H: What is this component in the picture (brass and plastic)?
What is the component in the picture?
AI: Sprague trimmer capacitor, rotating-vane type. Max value maybe 65pF, maybe 100pF. Good for about 100V max. |
H: 18650 cells - Unable to measure capacity
I got many 18650 batteries from notebook batteries and I want to test their capacity by my Turnigy Accucell 8.
My problem is, that when I start discharge program (0.5A what is from battery datasheet) it stops after 20mAh and battery have 2.75V. Battery recovers to 3.8V.
When... |
H: How many times can an IC be desoldered and resoldered?
For a long time now, I had a fear, that when you solder a SMD IC to a PCB, that you won't be able to desolder and resolder it again without destroying it. Recently, I did just that, but it didnt damage the chip, so I feel a bit better. I used a hot air gun at m... |
H: Relation between dash pot and spring in forces when extracting a transfer function
If a spring load some energy and use it for opposing other forces, and a dash pot has a friction, physically the both shouldn't have the same force-displacement equation ?
In most of dash pots, we could find an inner spring right ?
A... |
H: Wake me at 6 AM, respecting daylight savings and time-zone. Possible?
I'm an electronics noob.
I want to be woken up at 6 AM every morning (irrespective of daylight savings, irrespective of time-zone) by a device which has no visual display, no wires, and works forever.
How close is possible?
AI: Ok, this needs two... |
H: What kind of capacitor blew up in my old IBM monitor?
I pulled this out of an old IBM 5154 EGA monitor from the 80's. Clearly both are bad (though the monitor itself works anyway...). I know they're capacitors, but what kind? What would a replacement for these be?
I'm also curious about why the monitor would work ... |
H: Some questions about a low frequency reed switch interface circuit
I need to wire this reed-switch rain-meter sensor to a counter input or to an isolated analog input channel of a data acquisition board. The sensor will be around 30 meters far away from the data acquisition board. The counter input has Schmitt trig... |
H: What should be the voltage divider resisor values in units?
I'm trying to build a circuit that lights up a LED when a battery connected to it is full charged. I found LM358 lying around so I plan to use it as a comparator. I want a 3.7v using a voltage divider, I don't mind if it's less or more a little. I already ... |
H: Running 12V PC Fan with 9V Battery
i got an old PC fan which according to its label runs at 12V drawing 0.14Amps.
I would like to run this with a 9V Battery so that it doesnt go too fast.
Does this make sense?
How long would the fan run approximately with a typical 9V PP3 sized battery?
edit: another question is, ... |
H: Powering 5W generator with A23
Can I use a small 12V A23 battery to power this negative ion generator?
Will it burn or will it last for long?
AI: Will it burn or will it last for long?
Probably neither, look at the Wikipedia page on the 12 V A23 battery.
Note how this battery consists of many small coin cells in se... |
H: Node method to resolve a simple circuit, I’m stuck here
So keep in mind that I’m a beginner, this is a secondary exam in my university and i just started with exercises so be kind with me :)
I can’t figure out what happened in that step.
It seems like they used some parallel resistor transformation but really don... |
H: FPGA double buffer strategy
I am working on a FPGA project where a host CPU writes a 10,240 x 16-bit look up table into FPGA logic. To implement this, I've utilized on-chip memory to store the values and read them out when ready.
An external trigger/go pulse kicks off a processing cycle which lasts several hundred... |
H: Detect 230VAC or 12VDC in the same pin
I'm designing an input interface for a microcontroller (uC). Want to detect signals (only want to know if there is voltage or not) of different typology, so you can have in the same input to the board:
0-12 VDC
0-24 VDC
0-230 VAC (Vpp)
Between the uC and the input (as it ca... |
H: Is it safe to rebuild my laptop battery pack?
this is my first question on this website, so please excuse me if I did not follow the guidelines correctly.
I have an Alienware 17 R1 (2014) and have been looking into rebuilding its laptop battery that has been dead for a while now. I have read up quite a bit into bat... |
H: REF02 not working - 4 channel 5v DAC circuit, star gnd connection, stripboard layout
I've connected my circuit as in the diagram, with a 15V PSU powering it (both amps are connected the same way) - but the DAC seems to be drawing too much current for the REF02 to handle, even though p.24 of the DAC datasheet descri... |
H: Question about AC and DC on a RC circuit
Suppose a simple RC circuit, R and C in series with a voltage source and an open switch. The capacitor is discharged.
The power supply is AC, sinusoid with amplitude 10 V and a frequency of 50Hz.
So, the power supply is
10 Sin(100πt)
The resistor is 100Ω and the capacitor i... |
H: Is there a material that conducts heat well and has a very high melting point, but is also an insulator?
A lot of insulating materials are also non-metallic, which typically don't have a high specific heat. However, I am interested in experimenting with insulators that conduct heat as well as metal, but impede curr... |
H: Inside a library of common functions (Instruction Set ----> High Level Program) is there information of how many clock cycles they use?
I am a Mathematical Person. So thinking from that perspective.
To make my question slightly more concrete. I was thinking of controlling a hobby servo through a Uart serial data s... |
H: Digital Audio Effects Design
I've recently graduated university with an MEng degree in Electrical and Electronic Engineering. As a third year project, I've used an ST-Microelectronics ARM Cortex-M4 based Nucleo microcontroller board as the basis of a programmable guitar pedal.
I would like to begin designing my own... |
H: Are there any commercially available PLC's that can compile/ download programs through an API?
My team has decided to use a PLC for controlling an industrial process that requires simple, real-time IO to external devices with minimal processing. However, we expect the exact outputs needed to vary between runs (in f... |
H: 12 V car battery short circuit with a wrench that has resistance of 0.5 ohms, how much current?
ANSWER/ERROR FOUND: resistance of the leads of the multi-meter is the culprit. The true resistance of the wrench cannot be measured using a basic multimeter.
The resistance of the wrench is more so roughly around 0.0000... |
H: What glue used here?
What glue is it? Is it safe for attaching?
AI: Its probably an RTV Silicone like Silastic. It comes in various forms but RTV Silicone is the generic name. |
H: Bode magnitude computation
Consider the following transfer function
$$
G(s)=\frac{1\times 10^6\, s}{s+1}
$$
If I evaluate the dB magnitude analytically at frequency 0.1 rad/s, we have
$$
\text{Mag. at 0.1 rad/s} = 20\, \log \frac{1\times 10^5}{1.1} \simeq 99 \, \text{dB}
$$
and dB magnitude analytically at frequenc... |
H: Low pass filter with two capacitors?
I'm trying to drive a speaker from an ESP8266 for a project, and found an article suggesting (ab)using I2S as a 1-bit Pulse Density Modulation DAC. Apparently that's pretty noisy, so the article gives the following circuit diagram for the low pass filter:
If I'm reading Wikiped... |
H: Switch a line level audio signal - which chip is best WRT noise, low loss?
I am relatively unexperienced with audio circuits, and need to switch a standard line level signal, AC, about 6Vpp. I have the chips listed below, and would very much appreciate some pointers as to which would be best - I only need to switch... |
H: geiger tube dc power supply
I have one of these HV dc converters and I was wondering if I can use it to supply a small Russian SMB21 Geiger muller tube. What other parts would I need to add not to fry the GM tube? Keep in mind I would also like to add a nice Arduino nano and display and turn it into a simple Geiger... |
H: Most efficient way to drive an LED from 9v source?
I have a circuit that I am powering from a 9v battery. I bought little 3mm flat LEDs and I want to use one for a power indicator, but don't want to use a voltage divider that will consume too much power. The rated voltage is 3.2-3.4v and it came with a current limi... |
H: What are TX and RX relative to?
I have been working with a device that uses RS232 communication to a PC. There has been some confusion as they have defined their TX and RX pins relative to the device. In their definitions they use to mean TX being the pin that sends data from the device. In my mind this should be l... |
H: What type of headphone connector is this?
I got a pair of Onkyo headphones as a gift a while ago, and now one of the connectors on the cable broke (the red one in the picture).
What type of cable connector is this? Searching the Onkyo website and amazon didn't get me anywhere. What do I look for to find a replace... |
H: Can somebody explain how this circuit works?
I have the following circuit implemented in the control of a thyristor. I know the basic functionality of the circuit, but i need a complete description of every component.
Thank you!
AI: This circuit is used to provide an isolated power supply, its used for protecting a... |
H: Capacitor not charging?
I am yet another software developer trying to step into the world of electronics... (so sorry for the basic questions...)
I am trying to understand how a capacitor works, but obviously I am missing a crucial part from all the helpful websites like sparkfun and adafruit.
I failed to solve an ... |
H: Oscilloscope had weird interaction with Laptop
Can someone explain to me why the below situation happened? Thanks.
I tried 'debugging' a circuit. The circuit was a H bridge, and I wa using it to sent current through human body to induce feelings.
I say 'debugging' because the circuit was actually functioning corre... |
H: getting outputs in simulation as all high impedance. topic: restoring algorithm for binary division
I am getting outputs of my hardware as all high impedance (ZZZZZ). i tried synthesizing the code and got these warnings. I think there might be a problem in the test bench i am trying to run.
source div_restoring... |
H: How to properly select a transformer in terms of thermal rise
I'm trying to reach a decision selecting a small transformer for a task, from an overseas company (which only significant because of the language barrier). I thought the selection would be easy knowing my voltage and load requirements, but the transforme... |
H: Voltage*time product of pulse transformer
I am designing a circuit to excite a piezo-electric crystal with 1MHz bipolar square wave at 30V (Vp-p=30V, Vb-p=15V) consisting of 10 pulses, 50% duty cycle.
The idea is to use a pulse transformer whose inputs shall be driven with +15V from either directions to achieve bip... |
H: Output Compare Interrupt does not work avr atmega
Hey I'm trying to do blinking led using interrupts on 16 bit timer.
My atmega model is Atmega168A.
Chip clock rate is 12Mhz.
Here is my code:
#include <avr/io.h>
#include <avr/interrupt.h>
ISR(TIMER1_COMPA_vect)
{
PORTC ^= (1 << PC5);
}
int main()
{
DDRC... |
H: How does a gold leaf electroscope measure voltage?
It’s my understanding this device can be used to measure voltage. How is this accomplished? What electromagnetic equations are applied and how is it calibrated?
AI: The gold-leaf electroscope can't be calibrated very accurately but there are voltmeters based on the... |
H: Signal Modulation with Carrier Wave?
Image B shows the frequency of an FM signal is changing, yet I know a single broadcast station on FM is specific to a single frequency. Is the pictured FM signal again modulated with another fixed frequency carrier representing the station frequency?
In Image A is the spectrum o... |
H: Why the LM358 working in this case and what the definition of "ground"
I asked this question previously Why this ZCD not working? and today I saw my friend using this AC voltage sensor module https://mikroelectron.com/Product/ZMPT101B-Single-Phase-AC-Voltage-Sensor-Module/ and the ZCD is working. The LM358 able to ... |
H: Using a straight end FPC connector for a tapered end FPC
I am new to working with FFC/FPC, and had a question about the different types of ends for these cables.
I have a piezomotor that connects via a 1mm pitch tapered end FPC. I need to connect this to a PCB in a very tight area. The recommended connector is this... |
H: How to amplify DC voltage using Op-Amp?
In some real-application, a certain module is used, and the output voltage from this module is from 5 to 10 v. The required voltage should be scaled to 10, i.e. the 10v yields a 12v, 5v yields a 6v, and so on.
All these details are not important, that's why I don't want to me... |
H: Is pin polarity a requirement in this TVS diode array?
I have a 4-channel TI TPD4EUSB30 TVS/ESD diode array that I've been using successfully on differential ethernet traces. Our design changed and the positive and negative pins have swapped positions which means I would have to flip the traces if I am to observe t... |
H: Slayer exciter transistor troubles
I have built a Slayer exciter using a 2N2222, with a 22 kΩ resistor, as well as the other needed components. (4 turns primary, 475 secondary.)
It works fine with a 2N2222, but I was wondering if it could work with a MJE3055T or a TIP31C.
I’ve tried exchanging the 2N2222 with these... |
H: Carrier Waves, modulation over RF vs on wire
I’m reading about carrier waves and signal modulation. It appears signaling has differences over RF vs wire. RF requires accelerating charges to induce a voltage change at the receiver. Straight wire only requires moving charges through the conductor.
From this, it seem... |
H: Picking components
I'm an electronics student and I'm currently working by myself on a DC-DC booster converter. By now I have already completed the simulation, and I'm currently selecting components in order to go make the circuit in the lab and see how well it works.
My problem is that I have no idea on how to sel... |
H: Effective resistance integrator circuit
I've encountered the following circuit and I'm puzzled about the effective resistance that the opamp will see.
I know that R1 is in parallel with R2+R3, so this would be easily answered by R1*(R2+R3)/R1+(R2+R3). But there's a ground between R2 and R3 and I don't know if that ... |
H: Power selection with MOSFET
I have a question about PMOS load driver. When V1 is high then Vout should be 1.5 V and it is okay. But when V2 is high, Vout should be 3 V rather than 2.4 V.
Can anyone explain me why this 2.4 V and how can I fix this?
AI: Can anyone explain me why this 2.4 V
It's because of the body d... |
H: How much smaller/bigger is ampere/second than miliampere/hour?
How much smaller/bigger is ampere/second than miliampere/hour?
I want to check with people who know this way better than me at this.
AI: a milliampere/hour is 0.001 amperes/hour. Since an hour contains 3600 seconds, 0.001 amperes/hour is 0.000000278 am... |
H: How output is not zero if error is zero in control systems
In a classical negative control scheme where we have a plant and controller in series and no disturbance. The system is designed such a way to make output is equal to input no matter what problems occurs in the system. Let's say output of the system is equa... |
H: Why didn't cpu clock frequency plateau at two orders of magnitude higher Hz?
Here is a back of the envelope estimate for an upper bound of clock frequency for modern CPU's:
The speed of light is 3·10⁸ m/s which is 3·10¹¹ mm/s, and I assume the speed of electricity is about 50% to 99% of that (wikipedia), so let's c... |
H: Why doesn't my difference amplifier get saturated in LTSpice?
I'm currently simulating my high- side current sense amplifier for measuring mains current(along with the LP filter) .I also have the voltage sensing in the corner and I have attempted to simulate a realistic mains current magnitude of 15 A with a source... |
H: Need help regarding BCD to 7-segment decoder
I am fairly new to digital logic designing and I need some help in regards to finding a BCD to 7 segment decoder on software. I am using proteus for my counter, and for some reason I am unable to make it work. It either gives low and grey outputs only, no high output for... |
H: Cannot amplify DC voltage using op-amps
I am trying to amplify a DC voltage scaled from 5-10V to another DC voltage with maximum 12V. Why I am not using just a DC voltage with that value? Because the input DC is variable according to some other parameters. All what matters is that we have a DC and we just want to a... |
H: Slew rate of two stage OTA
I have learnt two stage opamp designing from books and yourtube videos, but have always failed to understand slew rate formula which is I5/Cc(I5 is bias current of M5 and Cc is compensation capacitor). Always thought that slew rate should depend on load capacitor and not compensation capa... |
H: Please verify the proof for percentage of error in power factor measurement
I am constructing an ac wattmeter for my school project, one of the objective is to achieve discrepancy of result(power factor) that is within 5% as compare to the actual measurement result obtained from wattmeter in market. This is done by... |
H: Diode-connected BJT vs base-emitter BJT diode vs diode
I was having a look at the circuit design of Keithley 236 SMU. You can find this part of the circuit in the Keithley 236 Service Manual.
Q47 is a BJT. Only the base and emitter are connected, which means it is used as a diode.
I also made a simulation to compa... |
H: Can I use a connector at a higher amp if its lower voltage?
I'm making a PCB board where I'd like a barrel connector rated for 10 amps. I have been using part this part which is rated for 10 amps at 50V.
https://www.digikey.com/en/products/detail/globtek-inc/JACK-C-PC-10A-RA-R/8597889?s=N4IgTCBcDaIFIEEDCBpAtEtAFTBG... |
H: What does \$\beta\$ represent with respect to the length of a transmission line?
The picture below shows the ABCD parameters for a transmission line of length \$l\$ from this video.
Question: What does \$\beta\$ represent?
AI: Beta is the phase constant, the change in phase per unit length. |
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