text stringlengths 83 79.5k |
|---|
H: When to employ RF shield cover on PCBA?
During reparations and teardowns I have frequently come across PCB-mounted RF shields and covers. While I don't typically work with GHz processors or design RF modules I wonder if such covers could be a way to efficiently avoid EMI issues in projects where unit cost is not a ... |
H: Wire in hole for pins with hole in them?
Looking at two of the three barrel jacks in the graphic, two of them (the upper ones) have holes in their "pins" or "terminals". When soldering to this terminal, should I place the wire through the hole? Or should I line up the wire colinear and parallel to the terminal and... |
H: Can I replace a 12 V 40 W heating element with several 12 V 7 W elements?
Here is the environment: An RV fridge has a heat exchanger for cooling, looks like what you would stick on an IC chip, only 12" square. It has heater stuck on the back of it that is activated for the defrost cycle. This heater is 12 V, 40 W, ... |
H: Difference vcc and vc, vbb and vb, vee and ve?
As far as I know, potential difference (voltage), that's mean it needs two point to measure it.
Then what does vc or ve only or vb only?
If vce means potential between vc and ve? And what does ve only means or vc only means?
AI: From this website: -
Double letters (cc... |
H: Building a simple USB notification light
I successfully used an Arduino with the FastLED library to operate my WS2812 Ring Light. For my next project, I want to create a notification light for my PC.
Instead of using an arduino, I picked up a USB 2.0 Male Adapter Dupont Extender Cable and connected the USB to my PC... |
H: Why can't USB-C receivers be as small as their USB-A counterparts?
We're all familiar with the USB-A 2.4 GHz receivers from companies like Logitech that are absurdly small and barely protrude from the port. But when looking at available USB-C equivalents, they are quite a lot larger even after accounting for the fa... |
H: Can a memory backup supercap hold on for more than 2 weeks?
Most RTC chips have a VBATT input for backup power supply; besides a battery, you can use a supercap there, e.g. using the following scheme:
simulate this circuit – Schematic created using CircuitLab
How much time would the cap provide for your RTC while ... |
H: Unknown amplifier circuit Analysis
Does anyone know what this kind of amplifier circuit is? I am trying to analyze it by calculating its gain, cut-off frequency, and frequency response. I am not sure how to break this circuit into different parts by working on transfer function or general amplifier analysis, as par... |
H: iCE40LP1K FPGA - Performing an analog to digital function (Power monitoring) without an ADC
I'm using iCE40LP1K FPGA and I wanted to create a block that is responsible for doing a fast power down of all devices on the platform when the 12V is shut down due to powercut.
Whcih means, when 12V is OFF, we want the FPGA... |
H: Two devices sharing the same coaxial cable, what frequency channel should I chose?
The 2-stories house is equipped with a coaxial cable that has wall plugs in 1st and 2nd floors (it's also connected to the antenna on the roof).
Our IAP installed a modem for Internet (Arris CM820C) which frequency ranges are, accord... |
H: Charging inductor flashes an LED
I'm experimenting with how inductors store and release energy into a circuit. I made the following circuit (I'm not sure of the actual inductance value because I'm using a "Snap Circuits" electromagnet part without the optional "iron core" inserted. I understand why the LED flashe... |
H: Sensor - Use level shifter or not?
I try to design an electronics with a VL53L1CXV0FY/1 ToF sensor. The uC has a logic level of 3.3V and the ToF sensor seems to have different logic levels, but I'm not sure what I should choose.
Operating Conditions according to the datasheet:
The default level seems to be 1.8VDC... |
H: IR LED current not adding up
I'm trying to power 8 IR LEDs in series with a resistor at 12V. The forward current is 100mA, forward voltage is 1.2V-1.6V.
$$R=\dfrac{12V-8\cdot1.2V}{100mA}=8\Omega$$
So my resistor should be around 8ohms.
When I'm measuring my current, I'm getting around 30mA. When I increased the vol... |
H: With a transistor (as a switch), does the order of the parts matter?
I've wired up my project(s) similar to how they're laid out in A to control whether or not an LED is on or off. It works fine (as far as I know), but I've seen lots of examples online of circuits laid out in a B formation (including this SparkFun ... |
H: Does anyone know how this type of power supply works?
I bought it with the intention to convert 110V to 120V AC to 2.8V with the current being adjusted. I am not sure which is the input and which is the output terminals. Also, I am not sure what all the terminals do/represent. Is there anything else about this powe... |
H: Transformer humming after replacing halogen bulbs with LEDs
I replaced the IKEA 10W G4 halogen bulbs in my under-cabinet lights with 1.5W G4 disc LEDs and the 120-12V AC transformer started buzzing, but not if I kept one halogen bulb in. I recall reading somewhere (but can't find the link), IIRC, it's because the t... |
H: Are large decoupling capacitors necessary for USB hub plugs
At the bottom of this data sheet:
https://datasheet.lcsc.com/lcsc/1811151645_CoreChips-SL2-1A_C192893.pdf
the reference circuit diagram shows huge 100uf decoupling capacitors connected to the USB plugs. My circuit board is tiny and I am hoping to use a 040... |
H: Role of feedback capacitor in nanoamp current source
I am designing a nano-amp current source to drive a capacitive load, which can vary from about 50 pF - 200 pF.
Analog Devices has a helpful application circuit in a datasheet (page 14) for the LT6082C op amp, copied below:
My question: What is the role and impor... |
H: Actual Line-to-Line voltage from per unit value
In this question, I am able to find the per unit phase voltages using the symmetrical components. Taking the base MVA and base voltage to be the same as that of the alternator,
\$ (I_a)_1 = \frac{E_a}{Z_1 + Z_2 + Z_0} \$ where \$ Z_1 \$, \$ Z_2 \$ and \$ Z_0 \$ are t... |
H: MCU working at 3.3V and RS485 driver at 5V - how does this circuit work?
I was looking for a "quick and dirty" solution in order to work with MAX487 (5V) and my ESP32 MCU.
I know that Maxim integrated produces the MAX3485 and MAX3483 that are specifically designed to work with 3.3V, but I have a bunch of MAX487 (al... |
H: What is the difference between these two IC suffixes: EUKG and IUKG?
I am wondering what is the difference between these two ICs:
LTC3886EUKG-1
LTC3886IUKG-1
I looked at the datasheet and the following page, but I have no clues...
https://www.analog.com/en/products/ltc3886.html#product-discussions
Where should I ... |
H: How can I adjust the size of an integrated signal?
I want to test whether I have solved my differential equation correctly. I have this block wiring diagram.
But after the signal passed through the integrator, the amplitude is much smaller than I would have expected.
If the block wiring diagram represents the mat... |
H: What is the correct way to use "forked" DIP sockets?
In the dark depths of my parts bin I found a pair of connectors that appear to be some kind of DIP chip sockets, they look similar to these...
(Image source: Farnell - Aries 14-600-10 14-way DIP Header)
To my mind they appear to be an alternative to "normal" pre... |
H: What happens if the pins of two different usb thumb drives touch each other?
What happens if the pins of two different usb thumb drives touch each other?
Can the data get corrupted?
Can the data move from one drive to another?
Can the circuits get damaged?
AI: Absolutely nothing happens if two otherwise unpowered U... |
H: How can I change tracks with a button/switch?
I am working on a school project. I want to change tracks/signals but am struggling to find a solution for it.
What I want to do is have say 6 input signals/tracks which are then shifted between 12 outputs with a push button or a switch. I can then go between the brea... |
H: Why are three inductors and one capacitor needed to bias this transisor (radio frequency)?
Below is the circuit. I don't understand its purpose.
AI: The inductors do not affect the DC "bias", the resistors do. The inductors are used to filter high frequencies, (RFC = Radio frequency chokes). The RFC inductors cont... |
H: What does INH as an IC pin label mean?
While using a CAD model for a 74HC4051D multiplexer which I downloaded from SnapEDA I noticed that pin 6 is labelled INH rather than E bar (or Enable) as I anticipated from the datasheet.
What does INH stand for?
[]
AI: They are representing that signal as active-high Inhibit ... |
H: Does each IC need its own bypass capacitor when there are multiple ICs in the same circuit?
I am working on a circuit to measure the current drain of six hobby servos for a robotics application. I'm aiming to use six ACS712 current sensor ICs. The ACS712 data sheet shows a typical application circuit diagram with 0... |
H: Help resoldering SMD capacitor
I was cleaning my 1080 and installing new thermal pads when I accidently broke off a capacitor during disassembly.
Does anyone have experience resoldering SMD capacitors on GPUs and if so what solder do you use and what type of hot tweezers work best?
In the picture I've attached you... |
H: Voltage drop over open circuit
I am still learning the basics of electronics and this confused me:
I have a simple LED circuit like this (5V voltage source):
The LED has a specified voltage drop of 3V, and is rated for currents of 20mA at maximum, so I put a 330Ω resistor in series.
When I measure the voltage drop... |
H: Shouldn’t the Zener diode be not in active state here?
I thought the Zener diode (break down voltage = 6V) will not be active here. That is it will not start acting as voltage regulator here since potential difference across 4 kΩ is 4 V if not in connected with diode in parallel. So after connecting in parallel it ... |
H: What PWM frequency should be used for a solid state relay (SSR)
I am planning to use an SSR (see product here) to PID control the temperature of a heat bath.
According to the SSR40-DA the response time is < 10ms so I would go for a PWM frequency that is well above, i.e. 10Hz or even 1Hz.
Can an SSR be used continuo... |
H: PID controller for a heater using a Raspberry Pi, SSR and Python
I would like to PID control the temperature of a water bath using a RaspberryPi4, a solid state relay (SSR) and a heater (200W, 230VAC) using Python.
The IVMech library seems a good starting point.
As well as Simple-PID
I went for IVMech since I saw i... |
H: Ensuring full power from a battery
I'm trying to put together a breadboard solution involving an 18650 cell (routed through a LiPo charging board) that powers both an ATTiny85 and two NeoPixel sticks. Two buttons trigger interrupts that sequentially light up or turn off the individual LEDs on the sticks. (I'm a sof... |
H: What happens when we increase the voltage beyond breakdown in a Zener diode?
In the presence of a resistor, we can reason that the voltage difference between the given battery voltage and breakdown will be given to resistor. My question is without any other devices just only a battery whose voltage can increase or ... |
H: Transistor as a switch driven by a square wave
I'm trying to understand how to use a transistor as a switch. I'm sure I am not doing this right.
The input signal is a simple 30 kHz square wave, 3.3 V amplitude. There is a second gate signal which is also a square wave with 3.3 V amplitude.
When the gate signal is H... |
H: AC voltage and frequency as complex number?
For some software I am writing, I coded classes of electrical systems that receive a voltage and return the current response.
For the DC case that's easy: I pass a real number as argument, the voltage, and return another real number, the current.
Now I need to extend this... |
H: Is possible using SPI without SPI.h library with just using digitalWrite function?
I was trying understanding how SPI protocol works.
Basically they are just bunch of 1's and 0's serially for every its pins.
I wonder if I can send and receive data from SPI slave device without using SPI.h library. The problem I nee... |
H: How to compute component values for current-controlled 555-based oscillator?
I am building a project where I plan to have a current controlled oscillator based on a 555. The oscillator is controlled using current source I1 (a current mirror) charging capacitor C2 in lieu of the usual charging resistor. The curren... |
H: how to calculate the output voltage of specific circuit using superposition law
Hi, How to calculate the output voltage of the circuit is shown below. Using the superposition principle is the best or the one that you recommend. I'm using strain gauges based on the Wheatstone bridge, which brings me here. I calcula... |
H: LTSpice voltage source understanding
I came across this Short Video on Youtube by MicroType Engineering, link here.
His simulation on LTSpice was the below:
I tried the simulation on LTSpice myself. However I am curious as to what the voltage means. I entered the following values:
Does this mean the voltage sourc... |
H: MAX31865AAP+ PT100 Excitation Current Problem
I have a PT100 and I'm using MAX31865AAP+ for RTD-to-Digital Converter. But I have a problem and I don't understand why this is. I use 400R REF resistor for PT100 and the reference resistor current is almost 3mA. The reference resistor current also flows through the RTD... |
H: Operating above maximum characteristic supply voltage, but below absolute maximum voltage
I'm using an Alliance parallel SRAM IC, and under the Electrical Characteristics table, it says VCC can be min 3.0 V, max 5.5 V. In the Absolute Maximum Characteristics table, it says terminal voltage must be no more than 7 V ... |
H: Power path sharing with LTC4416
I am struggling with the LTC4416 datasheet. My need is a 4-cell Li-Po battery (13.6..17.2V) used as the device battery and an optional external power supply (18..24V). When the external power is applied, it is used. Otherwise, the battery will be used.
As I need to prevent external p... |
H: Non-rechargeable 9V battery with diode between 12V car battery
I have a microcontroller which is powered by a car battery, voltage is stepped down to 3.3V using a voltage regulator. However if someone cuts the cord to the car battery the microcontroller has a local 9V battery inside its control box that is tied to... |
H: Chip antenna ANT161575ST-1202A1 layout question
I am designing a GPS module using the following chip antenna:
https://product.tdk.com/en/system/files?file=dam/doc/product/rf/rf/antenna/catalog/rf_ant_ant161575st-1202a1_summary_en.pdf
The datasheet recommends routing the antenna like this:
The long "L" shaped trace... |
H: Wire resistivity / heat generation
How to calculate the volts/amps of a battery which is connected to a simple wire for heat generation?
That is, how to use:
known wire length, diameter/area, resistivity
to calculate the required volts/amps to heat the wire to 30 degrees Celsius?
the surrounding medium is air,
the ... |
H: Working on breadboard but not on PCB
I want to check what's going wrong. The circuit controls fan speed, based on temperature, with an Arduino Nano.
First, I've created te following circuit:
Gate resistor: 1K
Mosfet pulldown resistor: 47K
Then I noticed I actually created a voltage divider (R2 and R3) that's messi... |
H: 2-bit charge redistribution DAC output
So here is the circuit:
And here is the output:
I presume answer c) is the output when there's a transition from phase 1 to phase 2. What about the transition from phase 2 to phase 1?
Vout will be equal to 0 because of the non inverting input being a virtual ground, why is t... |
H: What is the correct approach to creating library of similar parts?
When coming to components like LEDs, resistors, capacitors e.t.c there are throngs of manufacturers and suppliers that provide parts that are very similar from PCB design perspective i.e the schematic symbol and footprint. What approach then does on... |
H: What does location actually mean in the Altium part providers preferences?
Please see the option inside the red box:
I am unable to find what exactly is meant by "Location" for a part. Is this:
Location of manufacture
Location where it is stocked
Create by an organisation that is head office in that country
Somet... |
H: Ferrite bead selection and simulations for a 2.4 GHz ESP32 3V3 power line
I want to be able to filter the 3V3 power line going out of the ESP32 MCU. Since this "may" have a frequency around 2.4GHz (Wifi or Bluetooth antenna). This may then affect other components that also need the 3V3 power from the same net. I ha... |
H: Why does it take 4-5 hours to charge a small hearing aid? Can a larger NFC coil shorten charging time?
Oticon makes hearing aids with wireless charging. For one of their models they use a size 13 Lithium-ion battery which corresponds to 270-320mAh. They claim that it takes 4-5 hours to charge this battery using an ... |
H: Placement of a decoupling capacitor
I am using the CD4046, and trying to put a decoupling capacitor on it. However, the power pin is on the literal opposite side of the power pin, like so.
As you can see, I have a decoupling capacitor, that is meant to connect the ground pin (VSS, pin 8) with the power pin (VDD, p... |
H: What does the circle with the “X” and the cross mean?
I am taking a look at a DSP block for a the Xilinx ZCU111 FPGA and I am getting held up on a simple question. I come from physics so I am not too used to looking at block diagrams yet, but what do the highlighted components in the block indicate within the fine ... |
H: Drawing a very simple component in KiCad without the model
I am designing a PCB in KiCad that includes the 328ST160 and 328SR160 transducer pair. I have been unable to find a PCB symbol for the two.
The physical component I have is just two pins, like so:
I was wondering whether I could just draw a resistor on the... |
H: Calculating optimal resistor values for an ATtiny84A circuit and NPN transistor vs MOSFET
I am starting my first project in electronics and I am having a hard time understanding the information available in the 84A's datasheet (pg. 179, Electrical Characteristics)
While drawing the schematic to my project I've not ... |
H: How to control a 12V relay from variable voltage source of a LED?
I'm new to electronics and need your help.
I have retrofitted a Chromecast to my car and have powered it using a cigarette lighter power adapter to USB. Currently the power adapter is hidden and powered from the cigarette lighter power source itself ... |
H: What does "M" value mean for ceramic capacitors like: 226M 473M 107M?
For example:
22uF 16V 226M
47uF 10V 476K
What does this last specification mean?
AI: what means that M value for ceramic capacitors like: 226M 473M 107M
This might help: -
Image from here. Or maybe this: -
Image from here. |
H: Correct connection to F3 type battery terminals
Looking for deep-cycle lead acid batteries, I come across several models which feature what they call an "F3" type terminal, like this:
Basically a vertical metal tab with a hole in it. I suppose I could use a faston ring connector, like this:
And then secure the ri... |
H: For a mathematical operation in CPU, could power consumption depend on the operands?
Obviously, the number of operations affect a CPU's power consumption, but does it solely depend on the operations themselves? For example, adding 0 and 1 involves setting one single bit, but adding 0xFF and 1 requires clearing 8 bi... |
H: What kind of wire terminator is this for computer power supply fan?
Trying to determine the style of wire-terminator used here so I can buy a few. What is this called? It's on the wires for a three-wire fan used in a desktop's power supply.
AI: Molex KK 254 Crimp Terminals :)
Molex Link
Digi-Key Link #1
Digi-Key Li... |
H: Interfacing LCD via SPI
Problem:
I am trying to figure out how to interface an LCD via SPI.
What is known:
It is 80x32 dot matrix.
There are 23 pins on a flex cable.
The pinout. I'll put it below. The LCD is marked with red on image.
I've been told that the controller is sbn1661g.
LCD is from Motorola advisor pag... |
H: Finding the electric field due to a "point" dipole in different locations
I'm currently taking a course in Electrical fields and circuits and came across this example problem from the course book. I am having trouble figuring out how to solve it. Below you will find my attempt.
From the textbook about point-dipoles... |
H: Microcontroller is being powered by the UART connection
I have a custom ARM Cortex M3 board that communicates with a Raspberry Pi 4 via UART. Only three wires connect the Pi to the MCU: Tx,Rx,GND. When the MCU power supply is turned off the device does not power down but draws 17mA from the Rx pin and is able to br... |
H: Interpolating a Discrete-Time High Pass Filter
I am currently working on a project on MATLAB, and I need to use interpolation and decimation on various low pass, band pass and high pass filters with sampling frequencies of 10kHz. There was no problem with interpolating my LP and BP filters. But trying to interpolat... |
H: How to get the parameters of a ferrite bead
I have been simulating a ferrite bead on LTSPice, however, I so far have been using the LTSpice database to select the Ferrite bead, I now want to use a ferrite that is not on the database.
However, how do I get the parameters needed to simulate the ferrite bead?
For exam... |
H: Why use external compensation on a buck IC?
The AP64200, with block diagram of
says about loop compensation that
The goal of loop compensation design is to achieve:
High DC Gain
Gain Margin less than -10dB
Phase Margin greater than 45°
Loop Bandwidth Crossover Frequency (fC) less than 10% of fSW
but the specsh... |
H: Which flux type to use when soldering stranded wires that will be conformal coated?
I am doing a hobby project where I am weaving stranded wire through vias on the PCB. There is a matching copper trace and solder mask under the stranded wire. The stranded wire is soldered onto the exposed copper trace. I do this to... |
H: Difference between Electric Energy and Electric Signal
Gas lighter and phonograph are two applications of direct piezoelectricity. In the first one, we have electric energy as an output and in the second we get electric signal as an output. But, what's the difference between Electric Energy and Electric Signal?
... |
H: Switch contact ratings
Inside an enclosure, a device is powered by an SMPS as follows:
The device operates under 12 VDC and sinks 6 A from the SMPS. The SMPS is wired to AC by an IEC inlet. Now I want to install an emergency stop switch either at point X or Y above. Here are the contact ratings of this button:
My... |
H: Why do we need a pull-up resitor and not directly tie the pin to 5V (Arduino)?
I'm not very good at analog circuits. So the question is:
Besides the floating pin problem, why do we need a pull-up resistor? Why can't we tie the pin directly to 5V?
I'm reading up on it and am getting mixed answers. One website said t... |
H: How can I calculate the values of the four resistors in a Wheatstone bridge?
I measured black-red = 400ohm, green-white = 350ohm in a 5kg loadcell.
How can I calculate the resistor values?
AI: Many strain gauges have gain calibration resistors in the excitation leads such as here: -
Image from RS, Tedea Huntleigh ... |
H: Is this op amp circuit a promising idea to measure 300VAC?
I need to measure 300VAC. I am using the following circuit and it is working good. In the circuit, I am using 2mA/2mA current transformer. More details about this transformer are available here.
However, I want to use only one power source of 3.3V to reduc... |
H: Transformer inductive kick?
Could someone help me understand the behavior in this DC circuit:
simulate this circuit – Schematic created using CircuitLab
When I press SW1 and hold it down briefly, the green LED flashes and goes out (while I'm still holding down SW1.) Then when I release SW1, the red LED flashes an... |
H: One of four MOSFET in parallel heating too much
I am doing an electronic load project in which I need to work with four MOSFETs in parallel working in the ohmic region (not switching).
I have a good heat sink. Furthermore, only one of the four MOSFETs is heating to the point that is impossible to touch it, while th... |
H: Help with capacitive touch button output configuration
Can someone help me with the basic working of this capacitive touch switch? I know it isn't very complicated but I just can't get over my brain block of what actually triggers when the button is pressed. Transistors have always been a frustratingly confusing to... |
H: Why aren't smoothing capacitors used in smoothing the output of fully controlled bridge rectifiers?
I was wondering why smoothing capacitors are not used in smoothing the output of fully controlled bridge rectifiers, like it is used in the uncontrolled bridge rectifiers.
AI: Capacitive load to SCR rectifier is begg... |
H: How to minimize the effect on DNL error from this opamp circuit?
By using the following single LM324 circuit, I create amplified bipolar outputs from a 16-bit 0-3.3V DAC output as follows:
My aim is to minimize extra DC error due to the above LM324 circuit especially not to increase the DNL at the final output. No... |
H: What causes the output of the flip-flop to be LOW in 555 timer monostable circuit?
Before pressing the button, the external capacitor isn't charging because of the short circuit applied across it, but the short circuit is happening because discharge transistor is ON because the \$\overline{Q}\$ output is HIGH, so ... |
H: What is this oscilloscope accessory?
I have access to a FLUKE 190-504 SCOPEMETER oscilloscope. The following picture shows one of its probes.
I don't know the circled accessory in the above picture. I looked for it on Fluke's website and found that its part number is FLUKE-RS400. The following links have more info... |
H: Is a 12V 20amp switch too much for a pc?
So u got this switch for my pc and it is a 12V 20amp momentary switch will that damage the pc?
AI: As a power, or reset, switch connected to the main board headers it will be fine.
The signals there are a few thousandths of an amp and 3 to 5 volts.
Excess volts or amps in a ... |
H: How to know if an opamp can drive capacitive loads?
There has been a lot of questions about how to stablise opamp circuits driving capacitive loads. However, I know there are some op amps that are designed to drive capacitive loads but I am struggling to find the search filter criteria to narrow down which opamps w... |
H: Capacitor discharging after power supply is turned off
I am actually a computer engineer trying to get a feet into the embedded world starting by learning basic circuit stuff using 5 V or 3.3 V provided by Elegoo power supply.
I built the following circuit, hoping that the LED would remain bright for a few seconds... |
H: Does a grid-connected induction generator create phase difference between the grid voltage and generated current?
I saw an answer to another question that stated:
"An ordinary induction generator connected to a power grid will draw lagging reactive volt-amperes from the grid and supply real power to the grid. It is... |
H: Why does this LED have three PCB pads in the data sheet?
Please see this datasheet here for QBLP615 LED.
The LED part top and side views are contained on page 3.
The recommended PCB footprint is shown on page 9.
Why is there a middle pad in the footprint and what is its purpose?
How should the third pad be put in... |
H: What are the recommended differential trace characteristics for Power over Ethernet input section?
I've been looking through a few application notes for Power over Ethernet front ends such as Microchip AN3468 and Skyworks AN1130.
I can't figure out what the characteristic impedance of the differential pairsets shou... |
H: Is a pull-up on open drain required when output is not used?
On a LTC3886-1 I can read this:
I see that all open-drain outputs are tied to VDD on the following application schematics:
Is there a reason why pull-ups seem required when the output is not used?
AI: Well for one, there is a statement on the descriptio... |
H: RX_ER peripheral not used in RMII
I'm using this PHY and MAC in this Controller
The Controller does not have the ENET_RX_ER peripherals in the 100 pin package.
In that case, can we handle the RX_ER in RMII interface using a GPIO port in the controller(taken care in firmware)?
Or can we actually not use the RX_ER si... |
H: Decoding VGA Signals on a microcontroller design concerns
I have a microblometer sensor that outputs a VGA signal with resolution 640 * 480 pixels. Lets say I want 30 FPS..
I would like to know what would be the easiest way to convert that video signal into digital to be processed on a uC then outputs the result af... |
H: Increase the voltage in a simple NPN circuit
I'm building the circuit described here, but I need to tweak it a little.
I need a stronger magnetic field from the coil to move a bigger 'swing'. So I want to increase the number of turns on the coil, but then I'd also need to increase the voltage in this circuit. I wan... |
H: Tiny inductors and capacitors connected in parallel to a DC motor terminals
Why would you connect tiny resistors and capacitors in parallel to a DC motor as shown in the picture?
Why would two of the resistors be connected to the outer shell of the motor?
I checked the resistors and thy are around 0.5ohm or less ... |
H: Switching step-down voltage regulator gives lower output-current than input current
I'm currently trying to build a photovolatik cell -> DC Converter -> Battery-management-System. In the early stages of the build I was trying to use the adjustable voltage regulator alongside of a potentiometer. I plugged in a solar... |
H: Ethernet Switch IC
I'd like to understand a little more on the Ethernet switches.
Consider this Ethernet Switch which is a 3 port switch.
Like, it has 2 copper ports and one digital (MAC side interface) port.
It is mentioned as Gigabit ethernet switch port. In that case, when the 2 Cu ports have 1Gbps input data co... |
H: How do you go from gate level to transistor level?
Is there a good method to go from circuit at gate level or truth table to transistor level, other than trial and error?
I have an example here to illustate what I am asking.
We have the function \$X=((A*B)+C)'\$ and the equivalent gate level circuit looks somethin... |
H: How can I pass serial data through a Raspberry Pi Pico from USB to GPIO pins to be read in another Pi Pico?
I read that the Pi Pico/RP2040 has 2 UARTs.
If I want to send data from a computer to a Pi Pico, how should I create a UART that uses USB? Micropython expects pin numbers to create a UART. If I use one UART t... |
H: Are inrush thermistors thermally insulated?
Vaguely related to this question but with some different questions and a different component.
For an inrush-limiting NTC thermistor such as the Ametherm SL series:
It seems purposefully designed to run hot when at the steady-state current, and this heat is necessary to m... |
H: Level translator as digital buffer
In the datasheet of the C12880MA (Mini-spectrometer) they recommend using a digital buffer on pins to and from the module (CLK, ST, EOS, TRG):
I'm not sure why.
In my case, I need level translation anyway.
Would a bidirectional level translator like the LSF0204 act as the "Digita... |
H: How does Altium designer decide the size of the solder mask?
Here is a footprint I created using the footprint wizard in Altium designer.
The red is top layer pad. The purple is the top solder mask. Whenever I change the top copper pad size, the solder mask pad size changes with it. It is not possible change the t... |
H: How is current the derivative of charge
If electric current is the time rate of CHANGE of charge. Then if I have a DC fixed current flowing into a resistor, same amount of charge is always flowing to that resistor, hence the derivative of charge is 0, so current is 0?
Or does the book mean that the electric curren... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.