text stringlengths 83 79.5k |
|---|
H: Would inductor energy reduce to zero in this case?
I would like to ask about this example. Initially switch at position a and then when current reaches some constant value then it's switched to b.
I'm interested in what happen in real life.
Someone said that when you switch from a to b, there is a time when the swi... |
H: How does temperature compensation work for pellistors in Wheatstone bridge?
Pellistors are used to detect combustible gases. Basically, the gas is burned inside the pellistor and the heat released will change the resistance of the detection element. The concentration of the gas is therefore transduced into the vari... |
H: Signal Dimensions in Simulink
I'm using R2022a, in Simulink I can not find the Display tab to access Signals & Ports>Signal Dimensions. Could someone point me in the right direction please?. Also, in the figure below the dimensions are 5x1. The signals are () = 5 sin(210), how was the 5x1 dimension determined by th... |
H: Measure capacitors in parallel and series to increase precision?
I measure a capacitor \$C_1\$ with an instrument that has a tolerance of measurement \$\pm 5\%.\$ I do the same with another cap \$C_2\$. Then I put \$C_1\$ and \$C_2\$ in parallel (values add up) and measure both of them with the same instrument. Did... |
H: What determines the current flow in a load?
If we apply a load of 100KVA to a 100 volts source, we will get 1000 amperes of current through it.
If we apply the same load of 100KVA to a 1000 volts source we will get 100 amperes of current in the load.
If voltage is high load will draw less current and if the voltage... |
H: What is the new constructor's argument rule in UVM?
I'm wondering why some new constructor has been implemented with argument and some new constructor has been implemented with no argument in UVM as the below example.
class mem_monitor extends uvm_monitor;
uvm_analysis_port #(mem_seq_item) item_collected_port;
... |
H: Why do UTP pairs need different pitches?
Why do unshielded twisted pair cables need a different pitch/twist rate for every pair of wires in a cable? Most of my reading on UTP says that the pairs in a cable must have different pitch or else the benefits of UTP will be lost which is the noise cancelling.
From what I ... |
H: Why does STM32CubeIDE debugger always stop on HAL_Init()
I've noticed that while debugging an STM32 project using the STM32CubeIDE debugger, the debugger always stops on the HAL_Init() function call even when I don't have a breakpoint listed. This even occurs when I create a brand new project, which makes me think ... |
H: How Sleeve Balun works?
How does sleeve balun (Balance to Unbalance) works? In the setup below, the ground and signal of the coaxial cable is connected directly to the antenna which is wrong since coaxial is unbalanced while the antenna is balanced. But I don't understand the reason why adding the quarterlength cop... |
H: Is ESP32's GPIO25 Pin adc1 or adc2?
I am trying to design a PCB with ESP32 and a Lora module I want to use serial1 for Lora RX/TX communications. I saw a board which is using GPI35 to Lora RX and GPIO25 to Lora TX. But in same time generally I am appearing that note also:
Note: ADC2 pins cannot be used when Wi-Fi ... |
H: HDMI connector power port
I am designing an HDMI switch with two inputs and one output. I found a multiplexer that can be used specifically for this purpose
(HD3SS215)
but it needs a 3.3 V power supply.
Can I use the 5 V power port from the HDMI alongside a simple regulator as a power supply or not? MUX draws at mo... |
H: USB to 2.4v receiver power reducer
I am trying to power a small receiver with a USB pack it shows 5v coming from the USB and it says max 3.5v coming into the receiver. I know somewhere there is an inline reducer to step down as not to damage the receiver. Plugs are USB to 2.1mm plug. I think I just need to find a s... |
H: Half-wave rectifier with filter and clipped input signal in oscilloscope
When building a half-wave rectifier with a capacitor filter for my electronics lab, there was significant clipping at the peaks of the input signal. When looking at the .csv file pulled from the oscilloscope, these "clippings" are filled with ... |
H: Trouble reading a variable inductor (tunable RF coil) datasheet
I have a trouble reading this datasheet for the Coilcraft 7mm Tunable RF Coils – 146, 150 Series. I see there are two main types of such inductor: with shield can and without it. I'm going to buy one without it.
This picture is what bothers me. On the... |
H: Write to flash in STM32 - Works only one time, second time gives error
I have two functions and I begin to call the function STM32_PLC_Flash_Set_ADC_Gains_For_Configuration_Index_0(uint8_t gain) first. It gives status == HAL_OK.
But after that when I call STM32_PLC_Flash_Set_ADC_Gains_For_Configuration_Index_1(uint... |
H: Find output current for a non-ideal op-amp
This is a past paper question. I can find a expression for output current (\$I_O\$) if the op-amps are ideal but I cannot understand how to solve it if the op-amps are non-ideal.
AI: EE&O,
but I cannot understand how to solve it if the op-amps are non-ideal.
For example,... |
H: Deep discharge protection of LiFePo4 cell with a single MOSFET with the right threshold voltage
Is it possible to build a deep-discharge protection circuit for lithium based rechargeable batteries by putting a simple enhancement mode MOSFET with a threshold voltage that is equal to the discharge voltage (e.g. 2.5 v... |
H: Relay delay LTSpice
I want to delay the time a relay turns off.
I have made a simulation on LTSpice that simulates "how long" it takes for the relay to turn off. The relay is simulated using R2.
I simulated the resistor R1 to vary from 100 ohms to 600 ohms in steps of 100. So for an R1 of 600 ohms, we expect the ca... |
H: I have a valve power supply with two outputs and want to switch a built in ammeter between the two without supply interruption
A valve power supply has two outputs, V1 is 700Vdc and V2 is 450Vdc.
I want to switch a 300mA ammeter between the two without interrupting either supply.
I attempted to use relays to switch... |
H: How to attach ground on a breadboard from a schematic?
I'm trying to build a circuit on a breadboard based on a given schematic, but I'm not sure how to "ground" components on it like how it is shown at node B:
What I have done so far:
What connections do I make and where do I have to make them so as to have a "g... |
H: Large capacitor at the output of high-side switch
I am looking at using DIODES' AP2411 high-side switch. Their typical app circuit shows a 120 μF capacitor at the output. Is that value too high? I am going to power on and off an ESP8622 IC that can sink up to 300 mA.
AI: The chip is designed for switching USB power... |
H: Questions about relays specifications
I want to use a relay to switch high power LEDs ON and OFF. Nothing out of the ordinary yet. My problem comes from the fact that my control voltage is not stable (it varies from 5V to 12V for example).
Is there a way to find a relay that will safely and reliably switch ON with ... |
H: Unclocked NOR gate SR latch not latching
I am starting to learn computer architecture and decided to try building an SR latch using NOR gates and without a clock (basically copying this video) on a breadboard.
My circuit is pictured, it is using an SN74LS02N IC for the NOR gates and I am powering it using a micro U... |
H: What's wrong with my wire connections? (LED strips only getting ~1 V)
I'm trying to make an LED strip work, with these parts:
A WS2812B LED strip (60 LEDs/m), 5V
An Alitov 5V 15A power supply
An Arduino Nano
My issue is that the strip isn't getting the 5v it requires. The arduino is just running simple code to sh... |
H: How can I calculate the max. allowable load for my reference voltage?
I have a 2.5V reference voltage set up like so:
I want to determine how many ohms in load this 2.5V can bear before the TL431 is unable to hold the voltage. I know that this IC requires 500uA to 1mA in order to regulate the voltage. How would I ... |
H: Where should I place the ammeter to measure current flow between A0 and GND of the Arduino here
I was trying to build a circuit in tinkercad that plots the voltage/current across A0 and GND pins of Ardunio. To confirm that the plots displayed on the screen are correct, I decided to also add voltmeter/ammeter to the... |
H: Why do we use low frequency with copper wires and high frequency with air and optical fibers?
The bandwidth of twisted pair copper wire is low. Why can low frequencies propagate longer distances through copper wires than high frequencies? On the other hand, high frequencies can propagate long distances through air... |
H: Buck converter with interleave yields wrong output voltage in simulation
It isn't obvious to me how to solve this by hand (if anyone knows I am very interested), so I thought of simulating it instead. We need to know some values, though:
Duty cycle of switch A \$D_A = \frac{V_{in}}{V_{out}} = \frac{30\text{V}... |
H: 36VDC to +/-15V linear regulator setup - will this design work?
I designed a +/-15V power supply setup and trying to find/fix problems before running another PCB production run.
It will accept 36VDC (800mA) from an off the shelf part via a barrel connector. I cannot change that part of the equation so I'm trying to... |
H: RGB LED simulation with Arduino code
In this Arduino code, I want to when press numbers from 0 to 8, my LED s respond to it.
Everything is working fine from 1 to 6 and 8.
But when I select 7 and my code doesn't run well and Red and Green breathing interferes with each other.
I don't understand why my 7th function d... |
H: Can I remove the power wires of USB 3.0 and still use data wires?
So I have this SATA to USB converter for 2.5 inch HDD
I want to cut away the power port (5v) and use the remaining data port with an separately powered (12v) 3.5 inch HDD. I was wondering if this will work or not (and possible risks for the HDD).
AI... |
H: How does this circuit work? (24 V lead-acid charger)
How should this circuit be controlled to ensure that the backup battery is properly charged? The battery is a 24 V lead-acid battery.
This is a circuit diagram of a UPS device.
A PWM signal is connected to the R15 resistor (I checked with an oscilloscope) that mo... |
H: What Stops the Windings on an Electric motor From Shorting with Each Other?
What stops the windings from shorting with each other? Are the windings insulated when the copper is still not bent, then the insulated copper is bent into the winding shape?
AI: The wire used for winding electric motors (i.e. brushless mot... |
H: Input impedance for a difference amplifier OpAmp circuit
For the above circuit, I would like to find the input impedance for the input \$v_1\$.
Assuming that \$R_1 = R_2\$ and \$ R_3 = R_4\$, then:
$$v_0 = \frac{R_3}{R_1} (v_2 - v_1)$$
As far as I know, the input impedance will be defined separately for each input... |
H: Two seemingly analogous cases of using Kirchhoff's current law to calculate current through a node
I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 2.4 Kirchhoff's Laws has the following practice problems:
Find current \$i_o\$ and ... |
H: Ethernet PHY - Buffer Type
I'm going through the datasheet of this PHY Transceiver LAN8701A
On Page 14, table 2.2, it is mentioned as buffer types.
This is the first time I'm coming across the table called buffer types.
Can someone explain what are the buffer types and why are they used?
Why can't we see this table... |
H: Need help to make a portable LED light based on the LM3421
I am trying to make a portable LED light based on the LM3421. I would like to use it in buck boost mode.
Input voltage from 4s battery-- 12 to 16.8
LED voltage - 14.4
LED current - 3A
PWM frequency of 20kHz
Is the LM3421 good for this task?
My main doubt ... |
H: Is there a convention for documenting a schematic with notes?
I want to add an explanation as to why I’ve done something a certain way (mostly for my future self) on my schematic. Yesterday when reviewing a circuit from last year, I asked myself “why the heck did I do that?!” And after changing the design to what I... |
H: Will layer-to-layer leakage happen in a PCB?
I have a four-layer PCB that contains a circuit that measures voltage from a very high impedance node. This voltage is a DC voltage value ranges from 33 V to 36 V.
The voltage measurement circuitry is present in the top layer. I have provided guarding only on top layer s... |
H: How to tell what serial protocol is used on a DB9 connector?
I'm trying to reverse engineer communication between a host and client device that uses a DB9 connector. I'm able to measure voltage between the devices with a breakout board and multimeter.
The pin-outs for RS232 and RS485 protocols, for example, are ver... |
H: PCIe End-Point configuration for communication with Root Complex
I have an ambiguity regarding the PCIe initial configuration which is performed by the root complex (RC) on the end-points (EP).
Both devices have their own base address registers (BARs). The RC configures an address on the EP BAR. What does that addr... |
H: Using electrical equipment made in the US, in Japan
A lot of (good) US stuff is available in Japan through international online sales (Amazon).
However, most equipment purchased in Japan from the US are shipped as-is, without any change, while the voltage is 120 V in the US and only 100 V in Japan.
I'm struggling t... |
H: How is frequency measured in a power grid?
I know that voltage and current are measured with voltmeter and ammeter, but how is the frequenc measured in power grid applications? I know that a phase locked loop (PLL) can be used, but is this method also used for power grid applications? What is the most used instrume... |
H: Resistor voltage sharply drops
Why does the voltage across R1 sharply drops, then slowly go to the ground in the simulations?
However, when I probe VC1 the cap does discharge in an exponential manner, as expected. Should the voltage across R1, have a similar exponential from 12V to 0V?
AI: Why does the voltage acro... |
H: How does the current mirror stabilize tail current in an op amp?
Op amps often use the "slave" side of a current mirror to provide the tail current for the input transistor pair, such as in this simple op amp voltage follower schematic:
The "gates" node in the current mirror is constant. Therefore, the gate-source... |
H: Maximum bit rate over a communication channel
Shannon formula C= B log (1+S/N)
Is this formula applied for baseband transmission only? or for both baseband and passband modulation? Can we apply it without any changes to any modulated signal? What about QAM, CDMA and OFDM, can this formula be applied with these tech... |
H: 3 phase low voltage signal generator
I want to create my own 3 phase signal. However, instead of it peaking at 230V AC it must peak at 5V AC.
This generator will be used to feed a secondary unit that uses this signal to perform its own set of operations. This secondary unit is off the shelf so I cannot give much in... |
H: How does electromagnetic shielding work?
How does electromagnetic shielding work in cables? I learned from school that foils are used as shields in coaxial cables to "shield" them from external electric and magnetic fields. It also keeps the magnetic field inside the cable to go outside (radiation loss.)
How can a ... |
H: How can I read an RFID tag at the back of a phone FROM THE FRONT?
I'm discovering RFID applications and I would like to be able to read an RFID card I strapped to the back of my phone (the most convenient location for me) by just putting the phone face down on the reader.
At the moment the reader (MFRC522) reads th... |
H: Offsetting an ultrasonic receiver's signal for an amplifier with a floating ground
I have an ultrasonic receiver that I'm putting through an amplifier. I've created a floating ground for the amplifier (because I want to pretend having a negative voltage supply). However, to achieve this I will need to offset my rec... |
H: Bandwidth distance product
A fundamental principle of communications states that for any given transmission medium, bandwidth-length product is constant. I know that optical fibers, for example, are used for high data rate transmission over long distances. High data rates means high bandwidth and high carrier frequ... |
H: Is it ok to have a PCB track cross another on a different layer?
PCB tracks carry electric signals and these produce magnetic and electrical fields around them. Due to these fields, the PCB tracks have inductive and capacative cross talk with nearby PCB tracks.
I sometimes see design where signal tracks are crossin... |
H: How to invert a NAND gate IC and have it work like an AND gate IC?
I have created this circuit design using tinkercad. I thought I had two 74HC08 IC:s. Turns out I only have one. Can I replace the second 74HC08 with an inverted 74HC00 and if so how do I do this? If it is not possible what other IC can I use from my... |
H: Issue converting push switch to toggle action using a D-Type flip-flop
I'd like to convert a momentary switch in a toggle switch using a D-Type flip flop from an SN74HC74AN.
For this reason I've created and simulated a circuit like this:
All works fine on the Multisim Simulation.
Then I've created a real prototype... |
H: Solar cell outputting voltage but 0 current
I recently acquired some small solar cells. When I go to measure the voltage, I get a clear reading, between 190 - 300 mV but hen I try measure the amperage, I get 0 amps, even with the multimeter set to 20 microamps sensitivity. Is the same method done to measure the vol... |
H: I am having trouble measuring the amplitude of a 97 MHz signal with an oscilloscope with a bandwidth of 100 MHz
First, I designed a Colpitts oscillator with a frequency of around 94-97 MHz. I added a common emitter amplifier to the design to increase the output amplitude of the oscillator, then I connected the prob... |
H: How can I limit input current to a raspberry Pi to 2 amps from a high current battery?
The circuit I currently have consists of a motor circuit and a raspberry pi circuit connected to the same battery. (2 series circuits from the same battery).
The problem is that during idle motor, a very small current flows throu... |
H: Fixed pulse width with 555 Timer
new here.
I have a question regarding sending a PWM signal to a brushless motor ESC using a 555 timer. I'm using an Arduino Uno to control it currently, but I'd like to simplify my setup.
I have an underwater thruster that I only care to run on/off at a constant set speed, and I'm c... |
H: Convention or IC for dynamically switching multiple paths on a PCB?
I'm trying to create programmable circuit paths (controlled via mcu), where my program can arbitrarily connect N pins on one side of the circuit/pcb to N pins on the other side. Ideally, this would work as a "pass-through" (minimal resistance) and... |
H: LIthium 18650 discharge voltage
I am capacity testing 18650 batteries from old laptops using constant current, previously I used 2.8V as discharge/cutoff voltage but now raised the value to 3.0V
Discharge current is 1Amp.
I know discharge voltages depends on battery specifications but my use case is broad and I can... |
H: My PCB works only when I spray isopropyl alcohol on it. Why is that?
I'm observing a strange behaviour in some of my PCBs: they start working only when I spray isopropyl alcohol on them (or, to be more specific, the boost converter starts doing his job only after I spray it with alcohol, while connected to a power ... |
H: I'm looking for a very sensitive photodiode
I'm working with a custom board that has a simple input to detect a closed switch, and I'm hoping to use it as a light sensor. I was thinking of just attaching a simple photodiode (Like this one: https://www.digikey.com/en/products/detail/excelitas-technologies/VTP9812FH... |
H: Op-Amp inverter not working at high frequencies
I set up an inverting Op-Amp with the following schematic, inputting a 32.8 kHz signal. Two identical resistors on each side of the inverting input. Bias voltage is 7.5 V, Supply voltage is 15 V and 0 V respectively.
I expected an output like this, where the input is... |
H: Op-Amp Voltage Follower not working at "extreme" voltages
I was testing the AD712 on LTSpice with a simple voltage follower.
In a perfect world, I'd get this.
Instead, I'm getting this.
Now, I am aware that op-amps do not reach their V+ and V- voltage and usually fall a bit before that limit. However, according ... |
H: Connecting different voltage sensor
I have a very basic question. I have a esp8266 device that needs to read from an analog device. the device runs at 24V, and the ESP at 3.3V. Should I connect both grounds? This is the schema:
AI: Current from the sensor must run back to ground, in addition the 3.3v from the senso... |
H: What is this strange black rubbery component? A capacitor?
I'm trying to figure out how a PCB works (that I took out of something). I'm going through and looking at the different components, and I've identified a handful of parts, but I'm totally stuck on this one. It is near a few capacitors, but it has no uF writ... |
H: 2nd order RC lowpass filter cut-off frequency and Transfer Function
I'm stuck trying to calculate the cut-off frequency and transfer function of the filter below.
I'm not sure how to handle the mirrored resistors on the bottom (R9, R11) or the extra resistors (R12, R13).
New to electronics so any advice would be he... |
H: Isolation voltage to distance conversion
Introduction:
I am designing a board with a standard IEEE 802.3 1000Base-T ethernet interface. The board is a standard 4-layer FR4 board with all components on top and GND on Layer 2.
The IEEE 802.3 standard basically requires 1500Vrms isolation from the MDI to the MII part ... |
H: Dimmable LED strip from 3.3V
I want to control a 5A maximum 12V LED strip from a 3.3V ESP32.
I want do all of this with THT components ideally. I've been struggling to find the best way to drive the N FET so settled with an NPN as all of the IC drivers require 5V input.
Does the below schematic look like it should... |
H: Switching ATX PSU with a NPN transistor controlled by a 12V signal
I searched everywhere but I can't find a circuit to turn on a PSU with a 12V signal.
I know that PS_ON has an internal pullup but its value may change by vendor.
So I don't know if I can use this circuit: switch 5V with 12V
because a user wrote that... |
H: Weak edges over SPI data lines
I am developing a driver for an SPI temperature sensor, and having some trouble with poor quality edges near the end of packet on the data lines.
While I am not experiencing any data loss, I am worried this is evidence of a larger issue; any suggestions on potential simple causes of t... |
H: How does STM32CubeIDE locate the header file in such case?
I created a C/C++ project in STM32CubeIDE as follows:
In the main.c I had to write the include as follows:
#include "..\Inc\myRandom.h"
otherwise if I only write #include "myRandom.h", then I get the following error:
error: myRandom.h: No such file or dir... |
H: How to design RF Matching circuit for Transmitter MCU (BC66F2245)?
I am designing a PCB where i use the Holtek BC66F2245 Transmitter MCU to send data using RF at 433MHz. I'm currently drawing the schematic in Altium and now i've come to the point of designing the matching circuit.
I am sending my data at 433MHz wit... |
H: Voltage divider formula?
Actually I am not able to understand how the author arrived at this equation using voltage divider formula ?
what I tried is , I combined the two 2R resistor connected to ground in series and wrote 4R then, it is in parallel with the single R resistor .
I am confused where I made the mist... |
H: Active filter for low capacitance AC coupled input
I need to interface an AC coupled sensor with rest of my system. The sensor I am working with produces approx. 10V peak with 10V of DC offset but it has a very small series resistance about 50fento.
Sensor operates at about 35KHz. My initial thought is to use an o... |
H: Analysis circuit using Thevenin theorem
in the book "Engineering Circuit Analysis", example 5.9, i don't understand few things, hope someone can clear up for me:
Why does the dependent current can't flow through resistor 3k? If it's because of we assume 2 terminals of vx is open circuit then isn't we can't use KVL... |
H: Which manufacturer's logo is this?
I'm trying to identify the manufacturer (and hopefully part number) for these capacitors.
My guess is they're standard aluminium electrolytics, rather than something fancy like alupoly, but I can't say for certain.
Anyone recognise the logo?
AI: Which manufacturer's logo is this... |
H: Is there a standard for specifying the direction of a right angle wired connector?
When using connectors on wires (e.g. USB cables), there are four potential directions the wire can face relative to the connector:
(image snipped from https://www.newnex.com/usb-right-angle-cables.php).
Is there a standard for refer... |
H: Sliding window protocol
In the sliding window protocol when the receiver sends RRn to the sender the receiver's window is shifted to the right now starting at the n position correct?
Suppose this is the window of the receiver(third from top to bottom):
When the receiver sends RR11 to the sender the window then bec... |
H: PQ Theory: Imaginary power from \$\alpha\beta\$ to \$abc\$ coordinates
In "Instantaneous Power Theory and Applications to Power Conditioning" By Akagi, it states the following with regards to PQ Power Theory:
Is that \$\frac{1}{\sqrt3}\$ coefficient actually correct? Or is my approach incorrect?
I tried to derive ... |
H: Same behavior, different synthesis outputs, state machine coding style in VHDL
In an old course book on VHDL I've been revising, the author discussed the effect of coding style on the actual synthesis output of state machines. The example discussed in the book is a classic Mealy machine with synchronous outputs.
pr... |
H: Can extra long pads cause problems?
I am a hobbyist and I find it very difficult to solder and work with SMD components which have very small underneath pads. I can't see when the solder flows, I can't touch the pads with the multimeter, and therefore I have no confidence in the board.
I want to make extra long pad... |
H: Battery specifications open or closed condition
Are battery specifications for open circuit or closed circuit conditions?
I understand that a battery connected to a load will have a multimeter reading of low voltage, due to the voltage dropped on the internal resistance of the battery. Thus, if I have an open circu... |
H: D/C Decoupling Capacitor for Microphone Bias
I have the circuit below which provides a bias voltage to a microphone:
C10 is listed as a 47uF (bipolar) capacitor
Is there any reason I can't use something like a 100nF bipolar ceramic instead?
AI: First of all, C10 is not a decoupling cap. It's coupling cap.
The foll... |
H: Is there a way to measure potential power output of photovoltaic panels?
Is there a way to measure the current power output of solar panels?
I know how to measure voltage and current with an Arduino. What I don't know is how to measure the "unused potential power" of a solar panel at the moment. Let me explain usin... |
H: How to Calculate Ripple Current?
How do I calculate the ripple current a capacitor will experience for a given circuit?
For example, let's say I have a smoothing capacitor on the output of a full-wave bridge rectifier (120VAC, 60Hz) which leads into the primary winding of a flyback transformer (peak primary current... |
H: What is an integrated circuit equivalent for this circuit?
I am trying to design a so called signal switch in which I can direct the signal to either go to NODE1 while NODE2 remains HIGH, or the signal goes to NODE2 and NODE1 remains HIGH. The following circuit with transistors seems to do its job in the simulation... |
H: Nodal analysis in circuit contain voltage controlled voltage source
I have a circuit below and I need to determine the potential at \$v_1\$ and \$v_2\$. I have 3 questions:
simulate this circuit – Schematic created using CircuitLab
How do I use nodal analysis at \$v_2\$, or how do I solve this without nodal analy... |
H: What are some ways to improve on a voltage divider without a voltage regulator IC?
We all know the basic voltage divider. It looks something like this. Two identical resistors and the voltage in the middle.
I am, however, running into uses where this voltage divider is inadequately accurate. For context, I am usin... |
H: Common source amplifier analysis method?
When I make a DC analysis for the following circuit the capacitors are open circuit.
But what if C1 does not exist, what is the effect in DC analysis?
Does the signal generator still exist or should I short it?
AI: When C1 is present, you replace it with an open-circuit for... |
H: What microcontroller speed can work with lidar?
I'm making a lidar module as a project at my university.
The deliverable should be a module like YDLIDAR X4 Lidar or tf-mini lidar.
I watched a video from GreatScott in which he disassembled a YLIDAR X4 lidar. The microcontroller was a STM32F302x6. I went through the... |
H: Higher voltage from comparator to lower voltage at the output... how?
I am stuck on how to produce a lower voltage from an opamp used as a comparator that swings from +15V to -15V to +5V at the output, and 0V (when it swings to -15V) as well.
I attached the circuit, but for the life of me, it seems so simple, yet I... |
H: Most accurate way to measure universal (AC) motor current?
I'm designing a control circuit for a universal (AC) motor (single phase, brushed).
I've simulated the control circuit and it works as expected.
Circuit below is controlled by a STM32G4 series microcontroller. I'm in the process of adding the current measur... |
H: Problem with inductance meter
I'm trying to simulate a design I found for an inductance meter based on an LC tank and Arduino. To simulate this circuit, I put an amplitude for the current pulse of 40 mA, approximately the current that an Arduino pin gives to 5V. The values for the rise and fall times of the pulse... |
H: How to get 12V 2A power through an extension cable?
I have an AC to DC (12V, 2A) converter (/transformer) plug which I am using to power a wireless router. The connector has "center positive" polarity and the size of the connector is the ubiquitous 2.1mm x 5.5mm.
The nearest electrical outlet from the router is ~6m... |
H: sensitivity and frequency-stability of capacitor-based oscillator circuit
I am constructing a capacitive transducer which changes capacitance as a function of changes in other physical properties. The capacitance is about 0.1~0.5 nF range, and I want to detect about 0.05% change in its value. Due to some other cons... |
H: USB 1 to 2 switch wiring
I have 1 USB hub with mouse and keyboard connected and I'd like to build a switch to be able to switch this hub between 2 PCs. I have a 3-position toggle switch with only 2 contact pairs, so I can switch only 2 wires at a time.
Ok I can connect all GND contacts of all three USBs together, b... |
H: In I2C communication, slave not able to pull down properly during 9th clock pulse (not giving proper ack)
I am trying to communicate from master to slave using I2C communication. But during the 9th clock cycle, the slave is trying to pull high to low but it can only pull it down to half the voltage (3.3 V to 1.3 V)... |
H: Calculate current in one way circuit
In this circuit. What is the current passing through R1?
I was thinking about looking at the left and right sections separately and then just add both currents to get the total current. But then I realized that for eg the 50 ohm resistor and R1 are not parallel, but they are no... |
H: Verilog "bus switching"
Sorry I am not an expert with Verilog. I come from a software background.
I have RAM sharer/multiplexer that I am creating which can take "command requests" from 3 different sources (1. VGA controller, 2. Blitter, 3. External CPU). Each source gets a "slice" of time to communicate with an SR... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.