text stringlengths 83 79.5k |
|---|
H: Illuminated LED and push-button using only 2 wires
I want to make a circuit with an illuminated LED push-button that is far away from the input board and I only have 2 wires available. The push-button is not something specific. The input board will have many buttons, but not all buttons will have LEDs. The input bo... |
H: Problem simulating current controlled current source in LTspice
I've been trying to simulate the following circuit in spice. (I'm plotting the voltage over R7)
Everything is okay, and works as expected until I change the gain of the current controlled current source to a value that's greater than 58. And I should ... |
H: How to invert PWM signal on STM32
I am trying to control a WS2812 LED with STM32F103. The LED is a digital RGB LED also known as Neopixel. They are controlled by sending 24 bits of color data per LED to the first LED's data pin.
The STM32 is 3.3V and the LED is 5V. To be able to control it I put a transistor in... |
H: How do I convert a Eb/No from a dB value to a linear value
So for example how would I convert an Eb/No value of 2dB into a linear value?
AI: For a power value, the decibel value is given by \$10\log_{10}{\text{SNR}}\$. To obtain the SNR from the dB value, take the inverse of this formula: \$\text{SNR} = 10^{\text{S... |
H: Combinational System Theoretical Question
I'm currently taking an MIT-OCW course, where it says that a system built from smaller combinational systems following the following compositional rules is combinational:
Each component of the system must itself be a combinational device.
Each input of each component must ... |
H: CAN BUS Termination Resistors For CAN Logger Device
I am making a CAN logger device that will be connected to the vehicle OBD port. Since the CAN bus inside the vehicle is already terminated, do I need to terminate the BUS lines on my device end, right before the line feeds to the CAN Transceiver? Please check the ... |
H: How to drive an 100 mA forward current LED using STM32H743 Microcontroller to the collector without using external power supply?
I am new to electronics hardware so kindly help me and give me suggestions.
I am working on STM32H743 microcontroller for dual camera interface and LED interface.
The total current of my ... |
H: PIC24EP: What exactly are IOL, IOH currents
I'm going through the 'Electrical Characteristics' section of datasheet of PIC24EP128GP206 to find out minimum and maximum voltages and currents specific to GPIO pins.
While doing so, I came across the terms IOL, IOH in the following section:
What do the IOL, IOH current... |
H: Why my current mirror results in wildly different currents?
Let me start with that I'm new to current mirrors and my idea may be conceptually wrong. Feel free to ask any clarifying questions.
I'm designing a dual "LED lamp" with very finely tunable brightness including very dim levels. The control loop for the brig... |
H: Measurement of Resistor Parasitics Inductance and Capacitance
I have seen people doing some measurements of parasitic capacitance and inductance of some resistors, by using a vector analyzer and analyzing the graph of S11 with respect to frequency.
To get this measurement they have soldered the resistor to a type N... |
H: RF Power Meter vs RF Power Sensor
What is the difference between a power meter and a power sensor?
If I got this right a power meter is the instrument that reads and displays the measurements of the power sensor. Also, power meters have some reference RF signal to calibrate power sensors.
Are there power meters wi... |
H: Understanding equation for capacitor-voltage
For an simple RC-network the following solution of an ODE is given:
\$u_c=A_1+A_2\cdot e^{\frac{t}{\tau}}\$
I fully understand how the solution is calculated, but I want to have an feeling for it..
Am I right if I say that \$A_1\$ is the Voltage that would be across the ... |
H: Why is the impedance zero at cutoff frequencies in a series RLC resonance circuit?
I see that, in many derivations in the frequency analysis of series RLC circuits, \$X_L - X_c = R\$ or \$Xc - X_L = R\$ is considered at lower and higher cutoff frequencies.
So does that mean that the impedance \$Z = \sqrt{(X_L-Xc)^2... |
H: How can I calculate the amplitudes of this signal's harmonics?
How can I calculate the amplitude's of the harmonics? This signal is the voltage of a capacitor bank. There is a few amperes of current on the capacitors in form of PWM. On the signal the 200mV Jumps are the voltage drops on the ESR. The jump occurs whe... |
H: Is a triangle waveform a type of pulse width modulation?
I'm confused as I have seen a triangle waveform referred to in terms of PWM but a triangle waveform does not actually modulate the pulse width.
Is a triangle waveform a type of pulse width modulation?
AI: Is a triangle waveform a type of pulse width modulatio... |
H: Applying Ripple to a DC Source?
I have a system that is powered by a 25V Lithium ion battery pack. I need to test the system with a 1 Vpp sine applied on top of the 25V supply, so 25V +/- 0.5V ripple.
I know theoretically to get this signal I could use a function generator generating a sine wave and feed that thr... |
H: Is there a chart that translates old tube symbol to the new tube symbol
Im looking for a chart that helps you translates the old tube symbol into the updated format.
AI: Your tube symbol is indeed ancient. It seems to be a triode having three elements:
A directly-heated filament/cathode (filament + cathode are com... |
H: Is the transformer leakage inductance increasing or decreasing VS. size
I have built an sine filter for a small inverter that feeds a transformer 250VA. The filter is basically a LC filter, that uses leakage inductance of the transformer with a capacitor connected in parallel to the secondary with a small value dam... |
H: What is "Supply Input for Analog Functions" on a buck converter?
Regarding this datasheet for a DC Buck Converter, there is a VCC pin that on pg-2 shows an arrow pointing "out". What is this "out" connection arrow used for in practice?
Further along on the datasheet (pg-12), they show a board layout with that pin c... |
H: Trouble designing a low pass filter
I was trying to design a simple 3rd order low pass filter by cascading 3 first order low pass filters along with an amplifier at the end. The transfer function is straightforward:
$$
H(j\omega )=4\bigg(\frac{1}{j\big(\frac{\omega}{\omega_c}\big)+1}\bigg)^3
$$
where $$\omega_c=\fr... |
H: Is another diode needed when using a tip120 transistor?
I am using the circuit in the second picture, which clearly uses a diode. (Found here) However the TIP120 data sheet transistor already has a diode in the schematic symbol. Do I need to add another diode (like in the schematic) or should I remove the diode ... |
H: What kind of clamp is this?
This clamp is being used on a piece of equipment that is a few years old. I am trying to identify the type of clamp this is. If you the reader cannot identify it, leave a comment with something similar that will not damage thin wire when clamped.
AI: Ok, they look like the Kelvin clips ... |
H: ESP 01: Sketch uploading but not running
I have this ESP8266 I've been trying to get to work with a USB to TTL converter. I can flash the code through the Arduino IDE to the ESP8266 and it supposedly succeeds, but the ESP8266 isn't running the code. If I try to make a Wi-Fi network (to create a webserver), it won't... |
H: Why are there so few oscilloscopes with dedicated isolated channels?
Background
I am a junior engineer who works with testing and designing inverters for motors. I have been looking at a new oscilloscope since the one I had gave up. There are a lot of Tektronix TPS2024b being used since it has dedicated isolated ch... |
H: What parameter of this sensor necessary to decide about the required ADC resolution?
From the datasheet of this accelerometer, I need to decide about the adequate ADC resolution.
If my reasoning is not wrong the output noise floor of this accelerometer will decide the adequate ADC bit depth. So if the acceleromete... |
H: What kind of FSM is it, if outputs depend on internally generated signals?
The classical definitions are that in a Moore machine the outputs depend only on the state, while in a Mealy machine they are also allowed to depend on inputs.
But what if outputs and/or state transitions and/or register transfer opertions ... |
H: Is this a reference of an AC/DC REGULATED adaptor?
I need to choose an 230 VAC / 12 VDC converter which is regulated, that-is-to-say I need the voltage to be 12 V with a current of 0 to 5 A.
I found this one because it is the cheapest (price really matters) : https://www.mouser.fr/datasheet/2/260/GSM60A-SPEC-114709... |
H: Is current provided by a transformer fixed?
I would like to connect a bell to a transformer as part of a project im working on. The only thing i cannot seem to find an answer to is wether or not the output from a transformer is fixed:
Say i was to plug a 24v 330ma step-down transformer into the bell (which operates... |
H: What 'rated voltage' means in VDE certificates?
In a VDE certificate for a component (plugin green terminal blocks), a column gives the "Rated voltage(s) / V" with a value of "400" without specification wether it's VAC or VDC.
Does this mean that the component is safe to use for both DC and AC at this voltage ?
A ... |
H: External 0~10v controlled by a MCU
Newbie question :
I have an external power supply which gives me 10volts reference.
The machine I need to command is reading an analog order from 0V (minimum speed) to 10V (maximum speed) and I use a STM32WB55.
My solution is to add a DAC and then an op-amp.
Do you see another ... |
H: Using LED driver as PWM digital outputs
I'm building a robotics project where I need to control a lot of DC motors. I picked the DRV8870DDAR H-bridge motor driver chip which needs 2 PWM input signals to control the speed and direction. Since I need a lot of PWM signals, I'm thinking of driving them with a TLC59116I... |
H: S parameter meaning
I have designed a rectangular patch antenna and have tested it. From the results I noted a value of - 25dB on the
S11 parameter graph. The - 25dB is also at my resonant frequency of 915MHz. Is this a reasonable value for a patch antenna?
The application for this antenna is in the RFID sector.
I... |
H: Current measurement opamp, is this circuit flawed? Output all over the place
This is a circuit to measure a current flow that is 0-10A DC. The output goes to an ADC.
The circuit itself works fine, however, over a dozen cards, the output of this circuit is all over the place.
At rest, I=0, the output offset can vary... |
H: what is the pin connectors called that is used on through hole pcb with space above for swappable microcontrollers (or other devices)?
I have a medium size through hole PCB for prototyping. I remember a project in school that gave us a female to male connector that allowed us plug in a microcontroller (atmega328p, ... |
H: Why does the MAX30102 only work on a finger?
I am using a MAX30102 sensor with Sparkfun library for heart rate monitoring. It does work for a finger, but when the sensor is mounted on chest I am not getting a reading.
Why is that?
AI: The article that Transistor pointed to goes into some detail on how pulse-oximet... |
H: stm32 which timer and DMA channel should I use?
I am trying to control two lines of digital LEDs (WS2812b) with my STM32F103 using Timers with DMA and PWM. LED strips data lines are connected to PB5 and PB6 of the MC. I used STM32CumeMX to create the inital code for my project.
I click channel 1 and set it to "PWM... |
H: Proper way of connecting wires to pins on polymer films
What is the proper way to connect wires to contacts from a thin semitransparent "plastic" foil (see images). There are slightly different types; the first one with the 4 pins in a row is the more important one)? It is a thinflexible foil with pressure sensors,... |
H: 8085 SIM instruction don't care bit
While reading about the SIM in 8085 i came upon the accumulator state at the data pin 5 where when SIM instruction is executed we have to consider pin 5 of the accumulator to be don't care.
So I am not able to understand why do we need to define or mention about a don't care bit ... |
H: Electret microphone weird offset problem
Hi I am trying to amplify my output from electrec (analog microphone) with below design. When I used 1uF capacitor it has -300mV offset, so that I changed capacitor to lower value with trial-error applications. With 200pF ı was able to remove offset (it was something like -1... |
H: How optical sources having narrower spectral width gives higher data rates?
How optical sources having narrower spectral width '\$ \Delta \lambda \downarrow \$' gives higher data rates '\$ R_B \uparrow \$'?
For example: Laser having lower spectral width gives higher data rates ,similarly LED having higher spectral ... |
H: Adapting the 74LS170 open-collector "register file" to active-high TTL input
This is a question related to swapping a 74LS170 4 x 4 register file chip for a 74LS173 single 4-bit register. In the other question I wonder if there are even simpler ways to Turn a positive clock edge into a negative pulse to make a 74LS... |
H: Why do we have to discharge the capacitor before testing it in an LCR Meter?
LCR meters charge and discharge the capacitor to find out the capacity value (by using the time constant formula.)
I wondering why a charged capacitor(even few volts) can damage the LCR meter?
Why do we have to discharge the capacitor befo... |
H: Output voltage of AT28C64B into HC CMOS IC
I am trying to load the output of a AT28C64B parallel EEPROM into a 74HC194 shift register. The datasheet for the AT28C64B states that the minimum high level output is 2.4V, which I believe is not enough to drive the input pins of the HC type shift register.
Therefor, I co... |
H: Why did they design new connectors for USB?
At the time when the USB standard was being developed, there were a number of widely-available connectors that they could have used instead of making a new custom connector. Why did they not use mini-DIN or DE-9 or some other common connector of the time, instead of inven... |
H: How do I really turn 3.7volts to 5 volts (simple explanation, please)
Look I understand a couple of things in electronics but I need clarity with this one thing. See for power banks to produce 5 V from 3.7 V, how exactly is an inductor used? I have a 5 V regular and I know how to use it but I need to know how I nee... |
H: Implementation of Adjustable Current Limiting Circuit
I have a circuit that can deliver 0-10V and 0-100mA to a load, and want to have an adjustable current limit that will limit the current delivered. To do this I have a current shunt that I monitor, and when the shunt voltage exceeds a threshold a error amplifier ... |
H: Bridge rectifier outputting 338 volts DC with 120 volts AC input
I am measuring the live voltages right now and am seeing these numbers. I thought 338 volts DC was the result of rectifying 240 volt AC?
I understand that 120 volts AC is the Vrms reading and that the Vpeak reaches up to 170 volts. I just don't unders... |
H: High power opamp-based constant current source circuit
I am currently working on a high-power 28S lithium-ion charger for EV. I'm on a constant current stage, so you don't have to worry about all that balancing thing, I just want a constant flow of 15A through my 28S cells. I looked upon some circuits online that a... |
H: What type of glass fuse is this and what does the spring do?
This is a standard sized glass fuse like what cars used before the 80s. I can faintly make out 20A, but I’m not sure what to call it in order to find a replacement. The fuse in the picture has not blown, but it is the only one I have. I don’t think it m... |
H: Possibility of dissipating 20 W via Nichrome wire safely
I am looking to use 1 foot (0.3 meters) of 32 AWG nichrome wire to dissipate roughly 20 watts of power. Assuming the wire was submersed in still transformer oil, would I be able to do this without melting the nichrome?
AI: Let's try to ball park this to see i... |
H: Passive bandpass filter simulation gives wrong cutoff values
I'm simulating the following passive bandpass filter in LTSPICE, and can't figure out why my calculated cutoff values don't match the -3db values in the simulation. Here's the circuit I'm simulating:
Here are my calculations:
\$f_{cutoff, HPF} = {\frac 1... |
H: Can I use solid state output and relay output with the same components?
So I have a OTB1E0DM9LP Schinder Electric I/O distributed module and I want use it'output to control some 24v electro-valve's and some 24V contactors.
The module have
2 Solid-state outputs of 24V 0.3A
6 Relay outputs 30V 2A
I'm having 3 val... |
H: datasheet register address is not in HEX?
I am reading the this datasheet for the CAP1188 touch sensor and can't figure out what these "register addresses" in the far left column mean. I am used to seeing HEX addresses in datasheets such as 0x00, 0x72 etc., but this datasheet is adding an h to the end of.... I don'... |
H: Why does LTSpice simulation give me negative value on NPN emitter current?
So I built this circuit and I am trying to measure the emitter current, and the LTSpice simulation is giving me negative value reading... any idea why?
AI: This is what I found in the Electronic Devices book by Stephen Fleeman.
During the... |
H: Low pass LC filter goes "wrong" with capacitive load
I have been experimenting with this circuit:
simulate this circuit – Schematic created using CircuitLab
Vin has a lower frequency ripple of 2V and a high frequency (switching?) noise of 6.5V. At V1, lower frequency ripple is about 200mVpp and the high frequency ... |
H: Grabbing EMF meter magnifies signal 10fold
I have a Tenmars tm‑195. Holding it in my hand arm's length, still, I read \$2 \mu W / cm^2\$. In exactly the same spot, without me holding it, I read 10 times lower, \$0.2 \mu W / cm^2\$. I can reproduce this consistently. As far as I can tell, the main source of EMF ... |
H: Shift Registers for generating codes
can you explain me in simple words how does a linear feedback shift register work for generating a code?
Consider for instance this scheme:
If I have understood it correctly, each block is a D Flip Flop whose output bit becomes equal to its input bit after a clock cycle.
So, le... |
H: What is meant by power well in IC terminology?
Intel PCH Datasheet refers to power wells: Core well, Suspend well, Active Sleep well. Is power well same as power rail/power plane?
Does it have any connection with p-well or n-well in IC fabrication process?
AI: In the Intel terminology a power well refers to portio... |
H: Can I use a PWM controller to control the speed of a motor?
First off, I’m starting electronics as a hobby so excuse my lack of knowledge about electronics in general.
As a staring project, I was going to try and make a magnetic stirrer to use in a chemistry project. I was intending on attaching a magnet to a gear ... |
H: Fourierspectrum of the output voltage of an real inverting amplifier
First a quick descripton of my circuit:
The inverting amplifier amplifies by 20dB, the input voltage is a sinus signal with the Frequency 10 kHz and the peak to peak voltage is 200mV or 10V. The used amplifier is a OP177G. I've measured the Fast F... |
H: Series identical power supplies
Recently I made a thread about parallel supplies, however my helper fried one of them... Wonderful.
So I got myself 4 of the famous DPS-1200FB-1 12v 100A power supplies. So I am an electronics noob, hence my name. I know the issue with parallel supplies is current sharing, but I don’... |
H: AVR ATtiny1634 - Programming Issue
I've have already used Arduino as ISP Programmer to load codes to Atmel chips like ATmega328p and ATmega8 quite a few times without any problem.
On my last project though, I decided to use an Atmel ATtiny1634 microcontroller with QFN package instead of the bigger chips I used befo... |
H: Momentary overloading of a mains transformer at low duty cycle operation - what could go wrong?
I'm planning on using a 120 VA Hammond 1182P12 toroidal transformer to deliver 24 VAC to a 2.5 Ω resistive load (a JBC C245 soldering iron cartridge), implying 9.6 A RMS, 230 W if continously applied. A microcontroller-d... |
H: How to program micro-controller after PCB is printed
noob here
So this may be a very dumb question but: after you program a micro-controller and get a PCB printed, how do you reprogram it if you want to change it? Also let's say you get a surface mount version of your initial prototype, how do you program that?
As ... |
H: Measuring voltage across 1 ohm resistor
This might be a very stupid question, but I can't seem to figure this out and I'm going nuts thinking about it.
Assuming you are trying to adjust the fixed bias of a tetrode push pull pair in a tube amp. In many amps, for convenience, the cathode will have a 1 ohm resistor co... |
H: Scam or Legit: High Voltage Capacitor Manufacturing?
I have been looking for an 0805 10uF ceramic capacitor rated for 100v. Mouser and Digikey have only appalling prices for such specs (50 cents/piece at 5k for example).
I recently made this shocking discovery on Aliexpress from a (somewhat) reputable dealer:
http... |
H: Leakage Current in a AC/DC PSU without earth?
I'm looking at the data sheet for a Meanwell NPF-40 PSU. This is a class II unit and hence does not have an earth connection (see also mechanical specifications, page 6), yet the data sheet specifies a leakage current of <0.25mA @ 277VAC.
I was wondering how a class II ... |
H: Is this transfer function impossible with a low-pass Sallen-key filter?
I was given this transfer function and instructed to use a Sallen-key cascaded with a 1st order filter to achieve it.
$$H(s)=\frac{628^3}{(s+628)(s^2+628s+628^2)}$$
The first order transfer function is
$$H(s)=\frac{628}{s+628}$$
So if I choose ... |
H: How much electromagnetic/electric radiation does laptop/computer emit?
How much electromagnetic or electric radiation does laptop emit? I don't know in what measurement system you have to answer, but at least, I want to get the answer which should be enough "research" background to ask the question on Health.SE, wh... |
H: Voltage Regulator for Amplifier
I am wanting to create an amplified speaker system with a subwoofer.
I am fairly new to electronics and this is complicated for me so please be as descriptive as possible and patient with me. The internet has been my guide, so some of my knowledge may be incorrect. Any additional inf... |
H: Compromising on placement or routing of decoupling cap with BGA package
As far I know there are two important points related to power-supply decoupling capacitors. First the placement be less than 3 cm from the digital IC. Second the power tracks route pass through this capacitor first and then connect with the dig... |
H: What are the common footprint naming conventions
This question is ultra verbose, but I'm doing this in an effort to help other newbies (like me at the moment) as they first get into a CAD program like eagle. In the past when I've been new to a field I've always appreciated when people wrote out detailed explanation... |
H: Detecting low currents in high current industrial environment
I would like to detect if a current flows in a 3-phase industrial environment where currents can go up to 120A. Anyway, for me is only important information current is flowing/current is not flowing. The threshold should be somewhere about 0.5A - 1A. I e... |
H: High short circuit failure rate of aluminum electrolytic capacitors during the production processes
I have produced 1000 units of our new developed energy meter. Almost 20 aluminum electrolytic capacitors (2%) have failed short when we test them during the production processes. The Capacitor is a 470uF 35V (UPW1V47... |
H: Lt-Spice doesn't give me all the information
Here is my LT-spice simulation of a simple circuit.
I need to find the voltage across R6, but Lt-Spice doesn't give me that information.
Does anybody know why this is or if there is something wrong?
AI: It is there. It is one of the voltage nodes relative to ground so i... |
H: TI PCM51xx DAC Charge Pump Failure
I'm using a PCM5122 and previously a PCM5102 (this is the same part, but without the I2C/SPI interface) in my design and I've had a couple of prototypes end up with the 3.3v rail shorted to ground. A little investigation has yielded that the CPVDD (Charge Pump) pin is bringing the... |
H: What condition must be verified by the frequency so that an RC circuit acts as a differentiator?
So I am theoretically planning to make an RC differentiator circuit but I'm still a rookie with it so if someone can help me it would be appreciated.
AI: The condition is defined by time domain exponential behavior and... |
H: What item could this PCB board be from? (NOT serious, misc. question)
This is a fun, light-hearted question and not meant to be taken too seriously.
As a little fun thing between a group of friends, we found this question on a desk at work sometime ago about a PCB that had been removed from a typical household obje... |
H: Compare tiny capacitance using comparator
I want to compare the capacitance of two tiny capacitors at around 10^-15 F each. One will change compared to the other by at maximum factor 3. I need to measure the relative difference between them to an accuracy of around 1%.
My idea is to connect them in series to form a... |
H: Calculating inductance values from transformer datasheet
I want to simulate this transformer using LTSpice:
This is a microphone transformer. To do a simulation in LTSpice I need to know the inductance values for the windings. The datasheet gives impedance values and a frequency range of 30-25kHz, which is strang... |
H: solar pv micro-inverter strings
According to wikipedia; a solar micro-inverter is a plug-and-play device used in photovoltaics, that converts direct current (DC) generated by a single solar module to alternating current (AC).
I can understand the benefits of having micro-inverters on every panel increases efficienc... |
H: DC analysis of Darlington pair
So I'm having this darlington pair here
I'm doing DC analysis of this darlington pair
Can anyone explain why is R2 is 6.58, shouldn't it be aprx 7.39?
AI: I think Vbe of Q1 is equal to Vbe of Q2 which is 0.7 volts, so the
voltage drops about 0.7 volts through each transistor, like... |
H: Ground Plane for Flying Antennas (literally)
I am building a weather balloon sensor baord with a LORA 868 MHz radio module (RFM95x). The sensor will rise up to 30km and should transmit the full time.
I am using a PCB trace antenna with ground plane. For ground applications it is fine to have the antenna on the uppe... |
H: Confusion regarding voltage division
I am looking through some old exam problems and I came across one with a solution, I don't quite get.
"In the circuit below what is the voltage drop across R3?"
Their answer is zero, and they come to that conclusion the following way:
$$vb=va\cdot \frac{R5}{R4+R5}=\frac{2}{3}\c... |
H: Reverse Polarity Protection relay calculation
i want to make reverse polarity protection without voltage drop ,i was searching and i found this
https://www.edn.com/design/analog/4368527/Simple-reverse-polarity-protection-circuit-has-no-voltage-drop
now , i want to size this relay .
load ( 30 A , 48 V ) 1440 Watt
D... |
H: How to read this memory map of LPC1769 microcontroller?
I'm trying to understand the memory map of the LPC1769 microcontroller using the official NXP datasheet. The screenshot below shows at 0x00004000 to 0x00008000 there is 512kB of flash memory mapped, however the number of addresses between 0x00040000 and 0x0008... |
H: Removing silkscreen paint which overlaps copper padding after printing
I am new to advanced PCB printing and, as it turns out, my PCB printing vendor prints the silkscreen white text over some copper padding according to my design, which i don't know that would happen. Is there any way to fix this issue, Should i t... |
H: Getting different impulse responses by solving with Laplace transform and plugging delta-dirac
If I know that the output of a system $$y(t) = 2e^{-3t} \cdot u(t)$$
and it's specified that the input is $$ x(t) = u(t) $$
I was trying to find the impulse response h(t).
So I solved it using Laplace transform and I got ... |
H: How to conclude the nature of interference for such scenarios?
This is abit a hypothetical question. Imagine a signal chain where a AC-DC power supply is powering a transducer and the transducer output is coupled to a data acquisition input by a BNC cable.
Or I can illustrate the chain like:
AC mains->PSU->Transdu... |
H: "DC" Impedances seen looking into terminals of a BJT
Our professor in college was making us understand the stiff voltage-divider bias concept of a BJT.
simulate this circuit – Schematic created using CircuitLab
(Ignore the resistor and voltage source values)
Here he says, "The voltage-divider can be called/assume... |
H: Using a small Li-Po as a backup power source for a model
I am building a model of a trolleytruck (similar to a trolleybus but with a truck) and I'm adding an Arduino to get data. The microcontroller should never lose power because it would restart. I was planning to add a small Li-po battery to supply power to the ... |
H: The error "requires SystemVerilog extensions" while declaring an error
What's wrong with the following code? The array "FIFO" is declared correctly, but an error appears. Can you please help how to fix this?
module fifo(
input clk,
input [7:0]data_in ,
output reg [7:0] FIFO [0:8]
);
integer i;
always@... |
H: stm32f1xx how to use DMA to write to TIMx CCR
I am trying to control WS2812b digital LEDs with stm32f103. I have a buffer of color values for the LED strip and to transfer them I need to write the next value to the timer's CCR every time the timer updates. As the result I should see this buffer as a PWM signal on t... |
H: Wich battery configuration I should use to supply raspberry, arduino and stepper motors
I'm working on a project about a self-stirring robot with sensors to avoid walls.
This project is composed by one Raspberry responsible for all the algorithms, one Arduino to deal with the sensor and the motors, one sensor to m... |
H: hex inverter oscillator
I stumbled across this clock generator, and it is new to me.
I'd like to calculate its frequency (actually min and max, since there is a trimmer), but I don't know how to do, since similar oscillator looks simpler than this.
I tried to simulate this schematic, but it didn't work.
AI: This de... |
H: Could a resistor work as well as a signal diode in this level-shifting circuit?
The following hackish circuit uses the internal circuitry of one "sacrificial" WS2811 LED to level up the logic voltage to 5V for the remaining strip by placing a signal diode in series with the power supply input of that first WS2811 c... |
H: Voltage reference using zener diode and transistor
Below is a circuit presented in a book as a stable voltage reference circuit.
The other says that "Vref=Vz+0.6". I am not convainced about this equation, and I think that Vref is just VZ because of the virtual ground of the OPAMP. If I am not right, that means the... |
H: Step down transformer vs Electronic voltage regulator for appliances between 220v to 110v
I recently purchased an Instant Pot 6 Quart with specs(Electric Pressure Cooker) from the US(outlet supply 110v) and would like to send it to a country that has outlet supply of 220v. The cooker is rated at 1000W to only run a... |
H: Understanding electric torque of a motor
I'm missing something fundamental in my understanding of the torque of a motor.
Consider the following analogy:
I have a 10kg dumbell on the ground and a 1kg dumbell next to it. Let's say that I lift the 10kg dumbell off the ground with a certain force 'F'.
Now let's say I ... |
H: Impedance Control in Twisted Pairs and PCB
Why do differential signal traces on a PCB require a reference plane to have a controlled impedance?
Whereas, in an unshielded twisted pair there is no reference, there are only the two conductors?
Thank you for any answers that you can provide.
AI: Why do differential si... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.