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H: STM32F407VET6 "RAM overflow" while using only 2/3 of it (as far as I know)
I need to declare ~153 KB buffer as a framebuffer for display (more precisely at least two buffers, as one must be in CCMRAM to have enough space) and as this MCU has 192 KB RAM in total, it clearly should be possible. But as soon as I decla... |
H: Which opamp to use for differential reading of a shunt resistor?
I've made the following circuit, but I just can't get it to work. My LTspice simulation suggests that it should work, but it doesn't. I can get it to work in a normal inverted/non-inverted setup, but I need a differential reading.
I understand that so... |
H: Current distribution via current mirrors
I tried to distribute a current via pmos and nmos current mirrors (see the schematic below).
While the pmos and nmos mirros itself work fine, the distribution from a nmos to a pmos mirror yields an error.
The undermost red curve is the current through M9 (The first pmos mir... |
H: Can an inductor/capacitor/resistor combo emit the same frequency as a given crystal oscillator?
Beginner in electronics and radio frequencies in particular interest me. That said I'm having trouble understanding what components are used when. When I initially searched about radio frequencies, most knowledge article... |
H: Ampere hour and voltage
It's been a while since I had to deal with physics, in general, and I try to wrap my head around this and it's confusing.
So as I know, if you wire n batteries in series, Ah remains the same while voltage increases. While wiring them in parallel makes the Ah increase.
So in abstract, a batte... |
H: Is high impedance important for a differential amp measuring a battery voltage?
I want to measure voltages of multiple cells which are connected in series. I want to do that using a differential amplifier. I read about low input impedance, and what to do about it in this case. So I found this schematic:
simulate t... |
H: Identifying a switch symbol
Is the following sign a switch and if so, what kind if switch is it exactly?
It is used in the schematic of the ABB Eden (Adam & Eva) Module.
AI: It looks like non-latching normally open push button / switch
And you can see this table in datasheet:
So you have exact part number of ... |
H: Power supply switch prevents Arduino from working
I've connected eight 8x8 leds matrices to an Arduino, to display a scrolling banner.
When I developed it on an Arduino Leonardo powered by USB, everything worked fine.
When I moved the solution to an Arduino Pro Mini, I tried to use the onboard voltage regulator (us... |
H: How to replace a LED driver with a plug-able power adapter?
I'm trying to build a small table lamp with a 1 watt led inside. I've got this working with a matching LED driver, however, this driver is not nicely packaged and would require me to create some kind of additional housing:
I would like to replace this dri... |
H: Is it possible to power an arduino-like device from soil?
I am exploring some IoT applications I could work on. One of them is a sensor that does some periodical measurements of soil and saves it into inner memory or broadcasts over low-power radio channel.
I'd make the device as low in power consumption as possibl... |
H: Thevenin’s theorem, find the voltage across R4
I was try to solve this problem many time but the final answer is always wrong and not like the one in the book "Vth=11.7 V"
i have a midterm exam this week so i hope i can know how to solve it early :(.
Thevenin’s theorem, find the voltage across R4.
AI: Try redrawing... |
H: Block diagram for an analog audio amplifier,
I am attempting to design my own audio amplifier i have started the process with a block diagram. So far the "blocks" i have are:
Input audio signal → Band-pass filter → Preamplifier → Power amplifier → Load
The only restriction that has been imposed is:
No digital elec... |
H: Help with designing a peak detector
I'm trying to design a peak detector which can be cleared by using an pin on the arduino. To design the peak detector I was following this guide-How to make a peak detector circuit. I used the circuit shown in that post and it works fine.
I made some changes to the circuit to us... |
H: How long would a 5v battery power supply run a 5v LED strip for
I have an LED strip which requires a 5v input, to run from a portable power supply. The power supply has a capacity of 2200mAh with maximum output of 1A.
How long would the power supply be able to power the LED's before it needed replacing?
AI: If the... |
H: 2.2K ohm resistor in series with 1A power linear supply circuit, is that right?
Here's right after the bridge there's 2.2k resistor in series with the regulator.
This circuit is supposed to provide 1A current to the load! is that correct?
AI: I don't think that can possibly be correct. Maybe a typo for 2.2 ohms, w... |
H: Power supply over-current protection mode: constant current
I am researching power supply over-current protection modes, and I have a question about constant current.
Wikipedia claims (https://en.wikipedia.org/wiki/Foldback_(power_supply_design)) that the current remains constant while the voltage goes to zero. Do... |
H: Determining value of capacitor, in a opamp ampifier circuit
I am working on the follwing circuit, and have found all values for the components, except for C3 which i have a hard time finding.
My requirements are that it should be able to handle 40-16k Hz with a flat frequency response, and that i can change the gai... |
H: NOT logic gate with two inputs
If we assume that allowable inputs a, b and c are applied to the following logic gates, what is the output in terms of a,b and c?
I ran into the above problem, but I'm not sure if it makes sense. Because some NOT logic gates have two inputs which is not what I expect. I wonder if the... |
H: low power reading of NC switch with mcu
I want to read the state of a normally closed switch (waterlevel sensor) with a MCU. The NC-switch is connected over two about 20 meter long cables. The MCU wakes up periodically and enables a external pullup (R5) and reads then back the signal on a GPIO input pin. The pullup... |
H: How can I drive and measure the output of a bare ultrasonic parking sensor?
I want to use a parking distance sensor, specifically the common ones found on vehicle bumpers.
There are only two wires. How can I drive the sensor and read distance from it?
I specifically need to know what the input and output pulses sh... |
H: Drive LEDs from a second source
Given that I'm using the following circuit (adapted from this forum post):
simulate this circuit – Schematic created using CircuitLab
Which takes a 24V (Nominal) input and converts it over to 3.3V for an input on the Raspberry Pi Compute module. I'd like to have an LED present on th... |
H: JST 1.25mm connector soldering
I'd like to SMD solder the JST 1.25mm connector below with horizontal orientation aligning it to the side of the PCB (ie. in the end the male header should be plugged to the connector from the side of the PCB not from above the PCB). As visible the pins on the rear side are raised fro... |
H: Proper or instinctive design choices for trimpot direction
We all know its customary for a VOLUME control on any audio product should require turning CW to make it louder. In fact for user accessible rotary adjustments, clockwise almost universally means "more". This despite the fact that all plumbing faucets do th... |
H: How Does One Go On Charging Ni-Cd Battery's
Its a simple question but I can't seem to find any info on it. I have two Ni-Cd batteries (listed bellow) so i want to know how to charge them? And how to know if they are completely dead or are still alive. Each battery has 3 cells with the same type of package style as ... |
H: How convert a 3.3v PWM signal to a 5v PWM signal
I want to drive an array of leds with a transistor, no more than 240mA the things is that im dimming them with PWM works fine with 5v PWM but im having problems with 3v3 uc because with full 3v the leds are not fully bright, I try to solve it using attaching the gate... |
H: How to charge this battery?
I bought this new battery really cheap (it is really small and i needed a small 12v battery) but i am not sure of some things.
First of all, it says it is 1.3Ah/20HR. Does that mean that it can deliever 1.3Ah for 20 hours? Like, i could power a 12v 1A light bulb (estimately...) for 20+ ... |
H: Detecting the failure of LED
I am using a 12V LED for blinking purpose. Whenever it gets a signal from source(indicating the emission of rays), it blinks. The signal voltage out of the source is 5V. The supply to the source is 24V. I am using a relay in between the source and the LED.
Whenever the source is trigge... |
H: Common anode optocouplers protection
I build simple RPM meter (works fine), but i wish to try use it in harsh environment, so the question is how to properly protect optocouplers input from overvoltage/ESD? In the circuit two optoisolators with a common anode are used, and the cathodes are connected to the collecto... |
H: FSK demodulation using DSP
Especifically talking, I need to demodulate a low frequency FSK signal( betwen 120 and 140 kHz ). I already have a circuit of antenna that receive the signal and I already can sample it, but I still have a doubt of how could be the best way, faster and reliable, to process the signal.
Ba... |
H: How does resistive feedback affect noise figure?
I am working on a design with cascode CS amplifier with resistors in the feedback. What are the advantages and disadvantages of such topology? How the resistors in the feedback affects noise figure? It will be great there's a book or paper that I can reference to.
AI... |
H: Want to know what the +1 in this finite state machine circuit diagram is
Can someone tell me what the +1 that goes into the right side J and K is?
AI: It's a signal that's always a logical "1". |
H: Adjustable Power Supply Design
I am designing an adjustable power supply. Input voltage is 12V from adapter, and the output should be ranging from 0.5V to 12V.
I'm planning to use LM2575, but apparently its minimum output voltage is 1.23 based on datasheet. My concept is instead of using potentiometer to adjust fee... |
H: Control 12v lock switcher with Arduino Nano
I have 12v poser supply for electronic lock. It has 3 valuable pins: +12V, GND and PUSH. So, when I want to unlock the lock, i need to push PUSH pin to GND. How can I push 12v line to ground with Arduino Nano?
AI: A definite answer isn't possible without more information ... |
H: How to approximate the behavior of a phototransistor in the circuit editor?
While phototransistors are often used in this common turbidity sensor application (at least in part) because of their gain, their response is not linear since the gain will depend on the intensity of the light.
I'd like to learn to model c... |
H: Is it safe to repeat reflow soldering?
I have a board that is partially reflow soldered with a QFN and a couple of 0603 capacitors and resistors. I wanted to test functionality with this stage before I go ahead and place the other components whose working depends on this stage working right. Since adding components... |
H: 3.3V pullups in a 5V signaling system
I have an old design, since 1999 approximately, with an old FPGA XCS30XL and old MCU6840 MCU. They are connected together via a parallel bus peripheral and both utilise and power off 5V. But there is an oddity which is that some of the control lines between the two (IRQs, CSs, ... |
H: Making a 4 way switch, multiple options
Refactoring the question as requested:
I'm doing a small home automation project. The circuit I'm trying to control using an ESP8166 is this:
LOAD: 220VAC / 1A
To be able to control the circuit using the ESP and the mechanic switches, I need to plug a 4-way switch in the mid... |
H: ERROR:Xst:827, Signal next_states1 cannot be synthesized, bad synchronous description
it shows
ERROR:Xst:827 - "C:/Users/namec/Desktop/Class/VHDL/Traffic_Light/Traffic_light.vhd" line 46: Signal next_states1 cannot be synthesized, bad synchronous description. The description style you are using to describe a sy... |
H: ST Microelectronics I2C Interrupt HAL Library question
I am trying to get I2C (with interrupts) on an F411RE to work. I dived into the HAL library code and found this tid bit...
static HAL_StatusTypeDef I2C_SlaveTransmit_TXE(I2C_HandleTypeDef *hi2c)
{
/* Declaration of temporary variables to prevent undefined beh... |
H: Periodic waking up from deep sleep
what are the main used ways of how to handle deep sleep of some microcontroller (atmega or a cortex m0/m0+) with waking up periodically?
Right now, I'm building a Sigfox GPS tracker that should send GPS position every ~10 minutes and this interval should be configurable.
I solved ... |
H: Realize if(0) condition in analog circuit ?
I have a question that I think is really noob-like and I'm dead sure there's a pretty simple answer, but I couldn't figure it out myself and didn't really know what to put into google, so here we go.
I have a RC Circuit that has a square wave input voltage going from 0 t... |
H: My IC keeps blowing up - PAC1720 current sense IC
I am using a PAC1720 current measuring IC to measure the current/voltage/power being delivered to a lead acid motorcycle battery that is being charged.
Here is a newer datasheet and an older datasheet (with different info in them!)
Everything seems to work okay unti... |
H: Can multi-project wafer service merge projects with different number of layers?
I would like to ask some help to better understand limitations of multi-project wafer services (MPW).
In nutshell, i found about the service, that it merges many projects on wafer, so one project only have to pay for a share of its surf... |
H: Diode stops conducting. Conducts again after applying higher voltage. What happened there?
I have the following circuit for providing regulated 5V from a 12V power supply:
I have several hundreds of PCB with this circuit, and they work fine. However recently I have had a few of these PCBs stop functioning. I have ... |
H: Rated current vs peak current in connector
I'm looking at panel connectors and I'm not sure about the current capacity. One connector is rated at 25A continuous, which is above what I expect my device to be driving, but during startup, peak current gets to 30.8A. The specifications on the connector say nothing abou... |
H: VHDL that can damage FPGA
I read somewhere that bad VHDL code can lead to FPGA damage.
Is it even possible to damage a FPGA with VHDL code?
What kind of conditions would cause this and what are the worst case scenarios?
AI: Adding to @Anonymous's answer, there are designs you can build which can damage the fabric ... |
H: Dual SPI master control
I'm looking at a dual master spi interface, it needs to run at 20MHz which means push-pull for me.
My main concern is the output current of microprocessors, I could easily exceed the absolute maximum current rating if a software engineer decided to set one output high and the other one low ... |
H: Clap Lamp debounce
I am having problems with code for my clap LED.
It switches on and off when I clap, but it bounces, and I cannot find/figure a way to fix this. I think I do know why it is happening. Sound signal is spiky, and it detects more spikes from single clap. I am using Interrupts with Arduino, because if... |
H: 50 (or more) channels picoscope/oscilloscope
I need to debug communication protocol over 50 digital channels cable and 2MS/s sample rate. What kind of tool would be best suited to do that task? What other aspects should I consider?
AI: The reason you can't find a scope with enough channels is because you're looking... |
H: Bolting a steel ring terminal to a steel tab on IGBT?
This is a similar question to one answered here: what are the best practices for bolting a ring terminal to a steel panel?
However, the main difference is that I am not attaching a ring terminal to a chassis. I am attaching it to the steel tab on an IGBT.
Should... |
H: What determines the maximum discharge rate of a battery and how can I create a high current power supply from batteries?
I am looking for ways to make a mobile power supply for 10 units of MG996R servo motors, each of which can draw up to around 800 mA to 1 A and operate between 4.8 V to 7.2 V.
I have 12 Eneloop AA... |
H: Where does the extra voltage come from?
I am reading Practical Electronics For Inventors 4th edition and on page 384 there is a figure that shows basic power supply with single diode,I think its called half bridge.
There is picture that shows transformer that steps down wall plug ac down to 10 volts.There is writte... |
H: Op Amp Not Working
I am trying to amplify the signal from an electret condenser microphone with an LM741 op amp. I don't care about preserving the negative half of my input signal, so I am powering the IC with a single 9V battery. Here is the schematic of my design:
The microphone outputs about 20mV peak-peak and I... |
H: Is my Kirchoff's rules solution with mixed current and voltage source correct?
Problem:
Find \$I_{1}, I_{2}, I_{4}, I_{6}\$ using Kirchoff's rule
simulate this circuit – Schematic created using CircuitLab
\$E\$ is the voltage source of 8 Volts and \$I_{general}\$ is the current source of 3 Amps.
My steps:
This is ... |
H: VHDL simulation shows 'u' by read the input
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
entity TestRun01 is
Port ( Clk : in STD_LOGIC;
Din : in STD_LOGIC;
Dout : out STD_LOGIC_vector(11 downto 0));
end TestRun01;
architecture Beh... |
H: Effect on current draw and voltage when splitting a signal to many places
I have tried to Google answers to this already, but every search I make comes up with answers to other questions. That said, I'm happy to just be given links if there are already legit answers out there.
So I'm still quite new to electronics... |
H: I'm looking for a resistor which can withstand high power and has a low capacitance and inductance
I'm looking for a resistor about 25 Ohm at 13.56 MHz (this is our operating frequency). The resistor must withstand at least 50 W (100 W is better!) at ~ 1 kV voltage amplitude. As I will use this for compensating the... |
H: Capacitive proximity sensor size?
I want to design a capacitive proximity sensor to detect human presence at a distance of 10-15 cm.
Now I made my research on this type of sensor but everything that i found doesn't tell me about the size of such sensor, Can anyone help on how to calculate the size of the sensor?
Th... |
H: attenuators volts to micorvolts
I am a software engineer and have limited knowledge of electronics. I am using a Raspberry PI to control a AD5360 ADC eval board (http://www.analog.com/en/products/digital-to-analog-converters/da-converters/ad5360.html#product-overview).
I need to attenuate +-5 volt output form th... |
H: How to remove the negative component of a sine wave?
The following is the schematics of a simple circuit I'm working on, It filters and amplifies an electret condenser microphone's signal to get an output ranging from 0 to 9V (to drive an equalizer like leds not a speaker):
simulate this circuit – Schematic create... |
H: Advantage of series vs parallel battery in handheld product
There are many handheld product like laptop or an Handheld measurement equipment that all parts would works fine with 3.3V or lower VCC. However these devices still comes with a 11.1ٰV battery or higher voltage.
My question is, doesn't it more efficient to... |
H: VHDL read bit from input problem
entity TestRun01 is
Port ( Clk : in STD_LOGIC;
Din : in STD_LOGIC;
Dout : out STD_LOGIC_vector(11 downto 0));
end TestRun01;
architecture Behavioral of TestRun01 is
signal regr : std_logic_vector(11 downto 0) :="000000000010";
signal reg : std... |
H: Instrument(s) for measuring (and recording) temperature, voltage and current
I'm about to embark on a series of experiments regarding thermoelectricity. I am pretty new to instrumentation etc - though I played with electronics as a hobby, when I was a boy.
I am starting to acquire a set of tools for this exercise. ... |
H: Is this a good inverse parallel SCR drive circuit?
I have a design for a dimmer circuit, but I am unsure of its correctness or if there are issues with it.
It's meant to be controlled by a 50% duty cycle PWM signal - the dimming responds to the phase angle between the PWM wave and mains AC:
simulate this circuit –... |
H: filament led bulb inrush current
I'm tring to choose a relay for my circuit which has a Filament LED bulb as load.
The bulb is 230VAC / 60W 6W.
The nominal current should be about 0.03A which is not an issue for a regular relay. The inrush current can go from 10 to 15 times that value, from what I understand. So it... |
H: Calculating the annual energy consumption for a fridge
I'm looking at a spec sheet for a fridge that I'm interested in buying:http://aegelectrolux.co.za/doc/S53420CNX2/SpecificationSheet.pdf and http://aegelectrolux.co.za/cooling/bottom-freezer-fridges/s53420cnx2-stainless-steel-bmf.html.
I was wondering how they c... |
H: Spectrum analyser
Why do we use ramp generator (sawtooth generator) with local oscillator in a spectrum analyser?
I have searched in Google and I didn't find any answer that made me understand the concept.
Thanks !
AI: See Spectrum Analyzer Basics App Note 150 from Keysight or Agilent AN 150 page 9 for the classi... |
H: How to detect the fundamental frequency of a human singing voice signal
I want to make a digital hardware chip that can input a human voice, (singing simple wordless long notes) and output a square wave that is the same frequency as the fundamental frequency of the voice. I want it to work in real time.
I would li... |
H: What is cause my pantry LEDs to turn on slowly, and how can I mitigate it?
Recently I put an switched outlet in my pantry with a door jamb switch. A set of LEDs is plugged into that outlet.
When the LED set is plugged in, and I turn on an inline switch on the LED, the lights turn on instantly.
When I use the door ... |
H: What are the effects of trimming the diameter of a wire down to half its gauge?
I have a three-phase, 4 AWG 259/28 stranded power transmission cable (3 conductors total) running ~200m into a slip ring. The only way to connect to the slip ring is by using its 8 AWG pig tails. These pig tails are rated 600V and 40A, ... |
H: Ground pour under ESP8266 12-E
I want to pour ground under a ESP8266 12-E just for thermal reasons but I don't know if this can affect it somehow or if it's safe to do. The PCB is all under 5V, it's only 2 layers and it would have some signal traces, all on top. I have noted that with ground pour I get some more fr... |
H: Reason for USB power bank LED to be always on?
I hope this is somewhat on topic.
I received a free 2200 mAh USB power bank today and noticed that inside its casing it has a blue LED that is always on, even when not giving charge or being charged.
Are there any common design reasons for such behavior in a device ... |
H: How to convert maxwell equations to voltage and current equations?
How to convert maxwell equations to voltage and current equations?
Or how to connect maxwell equations to voltage and current equations?
I find that curl B or E is using a function of time and B has 3 components B1(t), B2(t) and B3(t) if using curl... |
H: Simpler way to enable/disable voltage regulator using DC jack shunt as a switch?
I am wanting to know if there is a simpler way to enable/disable a switching voltage regulator I'm using. The voltage regulator's datasheet says to pull the EN pin to GND to turn it off, and let it float to turn it on.
The DC jack is b... |
H: STM32F103 ARM - Modifying Clock At Runtime - FLASH Latency
I am having b it of confusion regarding changing the clock tree of an STM32F103 Cortex M3 at runtime and I am hoping someone can help me with it.
I am using a development board which has a 8Mhz HSE on board. As per the defaylt configuration of STM SPL stm32... |
H: Divide Sequencial Parameter Step in Spice
I've been designing a (very) simple MOSFET op-amp for school, and one of the things I need to do is determine the CMRR from my simulations. For the assignment, I'm just going to use the value at 1kHz, which should fulfill the assignment requirements. However, thinking about... |
H: Preventing Stack overflows in PIC MCU using C language MPLAB X
I am writing a C language code for PIC16f877a for an Alarm clock. In short, the alarm clock shows Time, Set alarm and a temperature & humidity reading on an LCD.
I have written interrupts for updating the time, for setting the alarm on and off and few o... |
H: Danger of high voltage in electroadhesion
I am currently doing my master internship to get a degree in mechatronics. For an experiment I would like to conduct, I am interested in using electroadhesion.
For those who don't know about it, the principle is easy. Get two electrodes (side to side or interlaced), put the... |
H: Opamp Voltage Follower
I am testing a buffer circuit. I came across a problem which i am not able to figure out why it is happening. Please help me out.
Problem:
In a buffer circuit the input voltage is measured across a 120k resistor. The opamp used is ADA4522-2.
Case 1:- When a single DMM is used to measure the... |
H: amplification,how to amplify 50HZ, 300uV signal
i have to amplify 50hz frequency 300 micro volt signal, so please suggest any opamp that amplify low frequency signal and i have to amplify 300 micro volt to 3.3 volt hence, i need 10000 gain opamp hence which opamp is meet this criteria orany other modules are availa... |
H: Why are the ADC and DMM readings different?
While doing an experiment we reached a conclusion which we wrote down as the DMM and the ADC reading being different.
Now after doing some research It does confuse me as a DMM does contain an ADC of it's own. Can someone explain the reason of such?
Our ADC is very simple ... |
H: Can you call verilog code from a c program running on a soft processor on an FPGA
I have a soft NIOS II processor instantiated on an Altera FPGA. I have 4 JTAG pins connected from the FPGA to a FTDI chip (lets call them A1, A2, A3, A4). I have the JTAG pins from 2 MCUs connected to the FPGA also (lets call them B1,... |
H: Working out the resistance for a circuit involving diodes
How do I get to 139 Ohms? A worked solution would be appreciated.
AI: My take is that there are unstated assumptions that have to be made. Going back through your course notes may help reveal those assumptions.
To get 2.4V at the output we need 0.8V accross... |
H: Cable joins on wiring LEDS in parallel
So I am a newbie.
I want to wire up a bunch of LEDS in parallel, and I have it all working fine on a bread board.
I can find loads of nice drawing of the schematics
But what I cant find a good example of is how to attach LED/Resistors to the wires.
I have seen wire nuts and pe... |
H: The equivalen reactance of an inductor and a capacitor
In my text book, I came across a problem where I needed to determine the equivalent reactance of a capacitor and an inductor (its ohmic resistance is negligible). To solve my problem I started to determine the equivalent reactance of both of them and to neglect... |
H: Strange symbol on PSU label
I have a PSU (wall wart) with a symbol on the label that I don't recognise. I'm curious as to what it means. It's probably some safety symbol of some form, but not one I have ever seen before. I'm sure it's obvious though:
It's printed on the label with all the other safety symbols, rat... |
H: AVR. How to configure as output just one pin?
In AVR C code, if you want to declare some port as ouput, you just have to to do this:
DDRB = 0xFF;
But how can I do if I want to declare as ouput just one pin. For example, I want to declare has output Arduino's pin 13, which corresponds to PB5.
I know I can declare ... |
H: Battery drain with higher volume
I was wondering if a Device connected to a speaker via Bluetooth drains more energy while sending high volume compared to the same sound on low volume. This might not be the perfect question for this forum as there might be a more computational aspect.
AI: No. Bluetooth is a digital... |
H: From transfer function to frequency response
In this question I asked about the difference between transfer function and frequency response. One user replied that "the frequency response is the transfer function where the transients are assumed to be completely dissipated". He showed an example, to prove his statem... |
H: Tantalum Cap Code Explained
I need to replace the following cap:
It was placed at the input of a device that runs off 24Vdc, like the following schematic.
simulate this circuit – Schematic created using CircuitLab
I'm repairing the unit after an explotion due to a maintenance where the board was fed 220Vac inste... |
H: Do CMSIS libraries also handle GPIO registers?
I'm currently exploring embedded programming with ARM processors. My embedded systems class has us programming on an Atmel SAMD20 (Cortex M0+). Our lab manual explains in detail how to utilize an Atmel library to access the registers on the processor to control GPIO pi... |
H: start a LTSpice simulation using code in MacOS
Help me please, I'm looking for the solution how to automate spice simulation with python on MacOS, currently, I'm thinking to use LTspice. However, I'm open to any proposal.
I want to make approximately <1000 simulations and extract data from simulation (e.g. value of... |
H: Winding mutiple axis coil
Wire coils can be used to 'pick up' alternating magnetic fields as described by Faraday's law. I want to do this in multiple axes around a single core. How could I do this in practice at a reasonable cost? I have seen 'transponder coils' that do this in a small package (e.g. Premo, Neos... |
H: LEDs with built-in resistors vs 12v leds
I've been researching this and cannot find any comprehensive guides. I'm looking to replace some incandescent bulbs soldered to pcb's inside my cars console. I've found some through-hole clear LEDs that have built-in resistors and they work but does that make them actually 1... |
H: Protecting microcontroller from drastic changes in load on power source
Is it necessary to protect the VIN pin of a microcontroller (currently arduino micro) when another device on the same power source is switching between 90W and 0W? Specifically, 300 LEDs are strobing, drawing ~18A from li-ion 18650s when on. Mi... |
H: Unipolar transistor's transconductance/admittance
Unipolar transistor basic variable transconductance is commonly marked by:
It is commonly used in calculations where we need drain current, Ugs, rds(on), and similar.
I have also seen many equations for calculating upper variables but here mostly used variable is k... |
H: Pre-biased Bipolar Transistor (BJT) Tradeoffs
If you go to the Discrete Semiconductor category on Mouser.com, there is a section for "Bipolar Transistors - Pre-Biased".
Is this as simple as including a resistor in series with the base?
Are there other nuances about this type of package?
AI: Pre-biased (also "resist... |
H: Are DC-DC converters designed with fixed output or fixed output/input ratio?
When I was learning DC-DC converters, I think they are a "DC version" of transformer (which is for AC-AC). So when I was designing a 100-30V flyback converter, my suggestion is: if a user inputs a DC 100V source, he gets a 30V output; if h... |
H: How to supply auxiliary power?
I just ordered an electronics hobbyist kit. It comes with a breadboard and a bunch of other components. Looking forward to work on my first project.
In my setup, an external device is connected to the PC via USB. One of the pins on the USB provides +5V to the device.
I need to keep th... |
H: PWM Control vs Variable Voltage Control - Calculating Duty Cycle
I have a strange problem. We have an actuator which was controlled using varying voltage. For example, to achieve setting 1 we measured that the resistance of the coil is 32 Ohms and 2.09 V is supplied. That should see a current of 65.33mA and power o... |
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