text stringlengths 83 79.5k |
|---|
H: Reasons for choosing a transistor instead of an op-amp as a buffer
I have often seen circuits for guitar pedals that use an emitter-follower configuration as the input and output buffer (see example below). If an op-amp can provide a greater input impedance / lower output impedance, why are they not used instead?
I... |
H: Are audio cassettes FM or AM?
I know that cassettes store an analog signal, but is the signal Amplitude-Modulated (AM) or Frequency Modulated (FM)?
AI: Neither, there is no modulation involved. The magnetization on the media is directly (and hopefully fairly linearly) related to the waveform amplitude.
There is a h... |
H: Is there current flowing out of an Operational Amplifier output?
I came across the following self-study problem, taken from The Analysis and Design of Linear Circuits (8th edition).
I was not intending to solve the problem, since I am just looking over all problems in the book. Something caught my attention, howev... |
H: Electrical Power production response to complete transition to electric vehicles
Just wondering if current world wide power grid capacity could handle a complete transition to electrical vehicles. If every existing vehicle was electric would the existing power production handle it on a global level?
AI: It doesn't ... |
H: Why do our electrical utilities use transformers way over their rated KVA?
My parents' house and my house have different electric utilities, but both are rural electric cooperatives. We both have 120/240V (60 Hz) split-single phase service (this is in the United States state of Tennessee). My service is sized 600A.... |
H: Need a circuit to convert 230V sine wave into 5V square wave
We have already obtained our result using transformer for our college project ,but can't find circuit to convert 230V sine wave into 5V square wave which is supplied to microcontroller.
Edit:
Our team got this circuit from web,but not sure whether it can ... |
H: Half-duplex wireless: Is a tuned antenna more important for the transmitter or the receiver?
I intend for this to be a general/conceptual question that could apply to any wireless communication hardware, however I will use a specific example to talk about.
Let's consider the nRF24L01. (Datasheet).
(Image from make... |
H: Measure ~300kHz Induction Heater RF Power
I have been tasked to gather data from an old running 335kHz 5kW induction heater system. It has no outputs available to give amperage, power etc. Basically there is an assumption that the unit is not doing a good job of controlling a constant power output. Given a constant... |
H: Are multiple groundplanes a good idea on a 4-layer pcb?
I'm working on a design of a 4-layer PCB. The stackup is like this:
Top: signal
Inner 1: power distribution traces and copper fill
(VCC) in some areas
Inner 2: signal
Bottom: ground plane
There is a lot of unused space on the signal layers. I'm tempted to... |
H: Identifying polarity of capacitor from PCB printing
I took out the old capacitor and didn't remember to check the polarity because I assumed the board would have more standard markings. Is there any way to figure it out with a meter or by the printing?
AI: The pin on the left is connected to the large power plane, ... |
H: What is signal resolution?
I'm trying to understand signal resolution, so therefore I am looking for a more clearer explanation. Primarily signal resolution is linked to an Analog-Digital converter.
Quoting from new electronics, http://www.newelectronics.co.uk/electronics-technology/whats-the-difference-between-... |
H: Transformer 2x24/2A secondary output
I’m currently learning about transformers. I have a quick question regarding the specification of a 2x24/2A transformer.
Here is a picture of the transformer:
Does 2x24V mean that this transformer has dual secondary windings that creates 2x 12V 1A output or does it have two 2x ... |
H: Precision Rectifier confusion
Its been a while I took a long hiatus due to not having a scope any longer, but I finally saved up and got myself one.
I was playing around with a precision rectifier (OPA350PA) and I came across something I don't understand.
Link to datasheet: OPA350 DATASHEET
What's going on with the... |
H: measuring output impedance of op-amp
I've just took for granted the fact that the input impedance of op-amp is high and output impedance is low.
I was reading "the art of electronics" lab book and there is an exercise that asks you to measure the output impedance of an op-amp by having the negative input connecte... |
H: Single MOSFET motor driver with oscillation on output
I'm trying to drive a small DC motor with a PWM with the circuit below, where I'm using a TIL111 optocoupler and a IRF510N MOSFET. The PWM (50% duty cycle) is generated by a MCU STM32F103C8T6, the +3.3V source comes from this MCU and the +5V source is another on... |
H: How are electric under blankets fail safe?
Electric under blankets are mains powered and yet you lie on them. 240V in the UK. They appear to effectively be a single resistive heating element. Clearly they're not earthed as that would be difficult, and I can't see how double insulation could apply.
It seems to me t... |
H: Driving power + USB over cartridge connector
I hack old hardware (mostly microcomputers) by putting new insides in them, but I still consider myself a newbie when it comes to electrical engineering, so please bear with me, because this question might be painfully obvious.
On my next project, I want to put a Raspber... |
H: Straightening the pins of a resettable polyfuse
I have resettable polyfuses like the picture below.
I am working on some PCB boards where I solder the wires myself on the PCB. Because it is very hard/cumbersome work to solder very small wires, I use the leads of components to make a path to a nearby component, prev... |
H: Rectifier, Flyback vs Transformer, Rectifier, Buck
I've just finished doing my first off-line flyback, which proved a success. A simple block diagram is as follows:
I know this topology seems common now, for example it is used in Apple USB Charger wall bricks (that video discusses cheap-knock offs, but the princip... |
H: STM32F103C8T6 3.3v pin max output
Im using STM32F103C8T6 with sl4432 as small radio beacon. It's working fine, but range much shorter than suppose to be. Sl4432 require max 85 mAh for 20dbm transmit, but how much STM32F103C8T6 3.3v pin can give at max? I can't find that info in datasheet and it's not GPIO pin anywa... |
H: Simplification Made to Gain Equation
I was watching one of Razavi's videos
https://youtu.be/pK2elUcXWzs?list=PLiDoPUX9nLkIw9EnIv_3K19wlcyJ6msYd&t=2309
Skip to 38:30
He did this:
He justified this approximation by saying that gm1ro1 and gm1ro2 >> 1. But how does that get rid of the extra +ro1 at the end?? Why is i... |
H: How do I specify a low RFI LED driver?
I bought a bunch of very cheap 18W LED lamps. I love them; they look great and the light is excellent, however the drivers throw out a lot of RFI and is interfering with my radio (quite bad at 50MHz, but also significant from 25MHz-150MHz). The interference is being caused b... |
H: Placement of feedback line on DC DC converter, before or after cap? (and dropout problem with LT8390)
I am using an LT8390 DC to DC converter, I have a highly inductive load and it is causing dips. The dips are shown here (and about a 6V drop for 7ms):
I need to get rid of the dips, which I will increase the outpu... |
H: Replacing burnt traces
I have a tiny PCB that I've been working on and off of for a while now. I received it with leaking batteries, and it had corroded some of the traces off the board. Most recently, I tried redrawing the burnt traces with conductive paint, but to no avail. I actually popped batteries in it last ... |
H: Need help explaining behaviour of a circuit
just can't wrap my head around this one for some reason. I am sorry if it's easy for you to see. Just confused on the duality of things in circuits, Is it a filter? Or is it a peak detector? How do you know which topology to apply?
I am only talking about the positive cyc... |
H: Optimizing magnetic field force of a coil
For a personal project, I've done a redesign of Samy Kamkar's MagSpoof project. Basically, it is possible to use an electromagnet, h-bridge, and microcontroller to trick a magnetic card reader into thinking a card was swiped, and feed it arbitrary data. I've designed and so... |
H: Debouncing IC input resistor?
I've recently been working on a breadboard compatible compact debouncing PCB. I found the MAX6816, a debouncing IC - check the spreadsheet here.
I made the below simple circuit as per the "Typical Operating Circuit" on the data sheet.
The datasheet does not show a resistor between gro... |
H: What is the transfer function of an ideal buffer in time domain?
Convolution is is defined as the integral of the product of the two functions after one is reversed and shifted. And in a system where its transfer function is g and the input is f, the output is the convolution of these two functions.
And if a signal... |
H: Why are the resistors in an AM modulator necessary?
In preparation for the amateur radio exam, I have been following the preparation course material by DJ4UF. In the section about modulation it presents this diagram of a simplified AM modulator.
The low frequency signal (NF) and the high frequency carrier wave (HF... |
H: Frequency-to-Voltage convertor diagram questions
I'm relatively new to electronics, but I'm interested in making the Frequency-to-Voltage convertor linked here as part of a larger project linked here.
Here is a diagram of the circuit I want to make:
(Image source: Math Encounters Blog)
Whilst the diagram seems cle... |
H: How these two diodes used in the ciruit protect from the voltage spikes?
I'm playing around with a simple DIY project, and after about three days of googling and reading stuff I still can't wrap my brain around two Schottkys below:
From the project page:
The two Schottky barrier diodes act as clamps ensuring that... |
H: DRAM in a FPGA - Image Sensor design
I am designing the simplest form of a camera: an FPGA that interfaces an image sensor and sends the acquired data to the host device via USB 3.0. There is no processing on the FPGA, it is used for sensor control and data acquisition.
By studying various resources online, I obse... |
H: Design emission (harmonics)
I attached a image of ESP32's datasheet where it say to add a series 470 ohm resistor to Tx transmission line. I wonder is it talking about which line, what are the pins?
And why that specific value?
here Is the link to the ESP32 datasheet https://www.espressif.com/sites/default/files/do... |
H: How does the Zoom ADC exactly zoom in (Practically)?
I am trying to understand the actual working of this specific Zoom ADC (diagram below), which is a 2-Step ADC with coarse (SAR) ADC and a fine (Sigma-Delta) ADC. I understand it theoritically but could not think practically on how it exactly zooms. I could write ... |
H: Analyzing a constant current source
I'm looking at some old chemistry education literature where a constant current source was proposed (J. Chem. Ed. 1969, 46(9) p613, link). I am trying to better understand the circuit and could use some guidance.
simulate this circuit – Schematic created using CircuitLab
Ques... |
H: TLC5940 with 200 LEDs from car battery
I'm working on project that involves 100 white and 100 RGB LEDs, controlled with 25 TLC5940s.
I've managed to connect three TLCs to an Arduino MEGAv3 and so far, so good.
I've found out that I have to add 0.1 μF capacitors (ceramic, but I can only get film) between TLCs VCC an... |
H: High AC voltage on Touch Sensitive Switch
I recently got a 120V/240V On/Off Touch Switch kit (ZIJIA P12-L56). They are a cheap way of adding Touch Lamp functionality to a standard lamp. It works great and I immediately started poking around inside it. While doing this I noticed that when I used my multimeter to ... |
H: Diode power consumption
I need to convert from 4 to 3.3V. So I was thinking of a diode, or voltage regulator. Voltage regulators, I know that it uses about 5mA to do the job.
How much current a diode uses ? I cant find this information...
[sorry I deleted the former question, was wrong 3.3 not 4.4]
AI: I need to co... |
H: Powering a circuit from either USB or LIPO
I have a small hobby project which includes MCU and some peripherals.
It is powered by 3.3V power source and consumes 200mA-800mA for up to a minute. However, most of the time it's in deep sleep mode where is consumes very little current (as low as 5 µA, hopefully) in orde... |
H: What kind of device in this circuit
It's a power entry part of a DAQ card, the bottom right is a DC jack. The power flow maybe:
Power DC jack -> ferrite bead -> cap -> common mode inductor -> cap -> ?
I guess the bigger black one may be a common mode inductor too. But I've never saw such a bigger one in this kind o... |
H: What's that metal wounded filament sponge looking thing and what is it used for?
I'm new to soldering and ordered a cheap starter kit. It included this:
I have no idea what this is. Any hint?
AI: Cleaning a soldering iron tip
It usually sits in a metal dish, and you push the soldering iron into it and wiggle it ar... |
H: Have I bricked my ATMEGA3328p by setting
I was playing around with setting the "system clock prescalar" (CLKPR).
I'm now in a situation where I can see that the clock is 244.9KHz, using my logic analyser and the "Clock output on PORTB0" fuse. (I am also using the /8 fuse.)
My code is still running on the ATMEGA, e... |
H: Does a diode block current but not voltage?
When running this test circuit on CircuitLab and my expected result was that only M1 would open
but then i noticed that the M4 mosfet is also open even though there is a diode between it and the the 3V
the Gate threshold on both is set to 1.5v
i also noticed some strang... |
H: Digital Logic: What are "hamming code" and "Binary code" state machines?
I'm asked to draw the circuit for a state machine in one hot, hamming code and binary code models. I know what is one hot state machine, but i'm not sure what are the other 2. Google also didn't help. Any ideas?
AI: If you have a state machine... |
H: -20 db/decade Gain Slope requirement for Stability?
I have been learning Analog Filter designing. I started with Loop Compensation in power supply. I came across a document. It states that:
The requirement for stability is typically met if the overall gain crosses 0 dB with a slope of –20 dB/Decade.
I have read s... |
H: Is the ATMEGA328P's serial baud rate quantised?
I'm using an ATMEGA328p, running from its internal oscillator (divided by 8 = 1MHz).
I've (roughly) measured the oscillator output, using my Salae logic analyser, as ranging from 960KHz to 1000KHz, so it's not awful. I did this using the "Clock output on PORTB0" fuse... |
H: Thevenine equivalent using loops
I'm trying to figure out the Thevenine resistance of this circuit using loops.
Perhaps loops is the wrong way to go? I've made the circuit using a breadboard and found out that the answer should be \$\frac{3R}{5}\$.
Using loops I get that
\$V_S-IR-i_1R=0\$ (1)
\$i_1R-2i_2R=0 \Lef... |
H: Is this equation wrong?
I have a trouble in understanding one of the current equation in the following example:
https://www.circuitlab.com/textbook/dependent-source-feedback/
To me
i3 = (Va - Vb)/R2 which yields:
Va - Vb = 10*i3
But the example says:
Vb - Va = 10*i3
Am I wrong or the example?
AI: Remember that curr... |
H: LTC6994-2 signal inverted and time delayed
I use LTC6994-2 to delay and invert input signal. I want 2s delay between input and inverted output.
However, this is what I get on the output:
Green waveform is input waveform. Output (Blue waveform) is expected to be inverted and delayed version of input signal. Howev... |
H: Basic Ideal Op Amp Circuit Analysis
I am trying to familiarize myself with operational amplifiers by going through this book by Sergio Franco.
This is a basic question regarding the example given on page 16, which I am struggling to understand.
According to the explanation, V3 is equal to -6V.
I know that when op... |
H: Normally On Circuit with Positive Trigger?
Pardon my lack of technical terms here; essentially I have an under glow kit on my car (along with some other lighting) that I want to expand the circuit on. I bought a pair of 5 pin relays to accomplish my task. Essentially the running board lights will constantly be on, ... |
H: Dc motor as torque transducer for BLDC motor
I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to load the BLDC by connecting the shaft of BLDC motor to that of Dc motor ... |
H: Use cell phone batteries as a battery pack
In my circuit, I used a simple charger circuit that works fine with standard battery packs that come with an overcharge/discharge protection circuit like this (green PCB inside.)
But I have some restrictions in my case and needed to use shaped batteries and found cell pho... |
H: Finding the supply voltage, knowing the resistance and current
I am learning the basics of electrotechnics. I had this task for my university that I failed doing and I want to learn how to solve it anyway. Thanks for assistance! :)
Here is the exercise task:
I assume I need to find the \$U\$. Knowing the \$I = 14... |
H: Finding power absorbed by resistor
Data:
\$ J = 1 A\$
\$ R = 2Ω\$
\$ R_{1} = 4Ω\$
\$ R_{2} = 6Ω\$
\$ k = 16 \$ - times
Calculations:
\$ J' = kJ = 16 *1A = 16A\$
\$ J = I_{1}+I_{2}\$
\$ J \frac{R_{1}R_{2}}{R_{1}+R_{2}} = I_{2}R_{2}\$
\$ I_{2}= J \frac{R_{1}R_{2}}{(R_{1}+R_{2})R_{2}}\$
\$ I_{2}= J \frac{R_{1}}{R_{1}... |
H: Double BJT circuit with one BJT off and one in saturation
In the circuit below, due to the base voltage, the circuit becomes a common-emitter setup. However, assuming a reasonable value for the base current the BJT should be in saturation.
However the value given for β is a βmin value (βmin = 30), which only holds... |
H: Choice of wire diameter for doll's house?
I'm constructing a 1:12 scale doll's house and I'd like to use enamelled wire run within the walls for lighting. Each room would have its own circuit controlled through a switch and then to a common 12V supply.
Some of the lamps will be LED and some will use filament type b... |
H: Thévenin's theorem exercise, resistances
I've some problem identifying the \$R_{th}\$
simulate this circuit – Schematic created using CircuitLab
Removing the load and short circuiting the Voltage source we get :
simulate this circuit
I've drawn the equivalent to better state my thought process :
First of all,... |
H: why is this microcontroller brown-out level detection at 2.6V and 3.4V
The default brown-out detection level for the ATmega32u4 is 2.6V (typical) in the range of 2.4V to 2.8V. The table of possible values:
2.0V
2.2V
2.4V
2.6V default
3.4V
3.5V
4.3V
Unfortunately there is a large gap between 2.6V and 3.4V. Another ... |
H: What program would be appropriate for designing a reimplementation of the TurboGrafX16 at gate level?
To be clear, I'm looking for a program I could use to redesign the TurboGrafX hardware at gate level, but to gate to gate, just for functionality.
Also, given that I'm interested in GPU design, what program do they... |
H: Pull-down resistors on logic gate and decoder inputs?
I'm designing a very basic circuit for testing a switch sequence. I'm using a CMOS decoder CD4028B (link to datasheet) and XOR gate (CD74HC86E - link to datasheet). Reading the switch sequence is crucial and therefore I've been thinking whether I should add pull... |
H: Two capacitors of same value connected in series and connected to power supply instead of one capacitor of equivalent value for PCB design
what's the purpose of two capacitors of same value connected in series and connected to power supply instead of one capacitor of equivalent value for PCB design especially for A... |
H: Convert ADC value to real voltage
I want to measure the input voltage to my circuit. The input voltage is supposed to be anything between 7 to 35 Volts.
I have a micro-controller with 12bit ADC. I am using a simple voltage divider to connect a fraction of input voltage to the ADC pin.
The voltage divider is simply ... |
H: SSC TLE5012B read out
I have some trouble with understanding the following IC and its SSC interface:
https://www.infineon.com/dgdl/Infineon-TLE5012B_Exxxx-DS-v02_01-EN.pdf?fileId=db3a304334fac4c601350f31c43c433f
It is stated in the datasheet, that the SSC interface is SPI compatible, exactly what I need. Now first ... |
H: Communicating between 2 different microcontrollers
My Arduino runs at 16MHz clock speed; another microcontroller runs at clock speed of 13MHz. If I send digital output directly from an output pin of the former to input pin of the latter, there will be a loss of data and the transmission will be corrupted.
Question... |
H: Why does my 3 V EL inverter make sound?
The question is purely academic, as normal sound dampening solutions seem to work fine.
I understand how electronic circuits make sound as per this answer:
How can "purely" electrical circuits emit sound?
My question is, a cheap 2 AA battery (3 volt) inverter makes as much so... |
H: Why Rod Core ignition coil in cars instead of E-I core or toroid core?
Why use a Rod Core ignition coil in cars instead of E-I core or toroid core? It appears the Rod Core coil in an automobile is just a Step-Up transformer. Why do car manufacturers us a ROD CORE? Is it superior for DC Pulses?
AI: Think of it as... |
H: Deriving the Integral Voltage-Current Relationship of a Capacitor
I am having trouble understanding the derivation of the capacitor voltage equation in my circuits textbook.
Here is the process they followed from the textbook
My confusion is: when the initial voltage across the capacitor is not able to be discerned... |
H: Determine MC34063AP Duty Cycle
A fuzzy area I want to clear up on the MC34063AP is Duty Cycle.
In the MC34063AP datasheet, toff an ton are a result of 1 / f, which is obvious.
toff is calculated by: 1 / f / ton / toff + 1
ton is calculated by: ( 1 / f ) - toff
The timing Capacitor CT is given by: 4.0 x 10 to -5 to... |
H: use sram as logic analyzer?
So I was thinking of buying a logic analyzer and found that a lot of the cheap ones are good to only a few mhz, and the microcontroller based ones can't have big buffers. So I was wondering if I could just use ram as a buffer? Like if it has 16 data lines, a 20 bit address, could I just ... |
H: How to produce a middle C on intel 8080?
This is a example problem in my book. Assuming pin 5 of port 4 is connected to an amplifier that drives a loudspeaker, the solution is given as,
The frequency of middle C is $$f=261.63\ \text{Hz}$$
So, the time period is,
$$T=\frac1{f}=3822\ \mu s$$
The program to produce a ... |
H: Relation between bandwidth, response time and disturbance rejection for a control system
I read the following line in a control system book:
Higher bandwidth corresponds to better command following, disturbance rejection and sensitivity to parametric variations. On the other hand, achievable bandwidth is limited by... |
H: Differential equations for a transformer
I would like to set up differential equations (please, no phasors in answers) for the circuit below:
So far I have two equations:
where I assume perfect magnetic coupling (so I treat M as a known constant).
Initial conditions are that at time=0, both i1 and i2 are zero.
T... |
H: How to know voltage used on a data bus?
How do you find out what voltage is being used on a data bus for the high signal?
On a small electronics I guess you can assume it will be 3.3v or 5v but what about other circuits, say in a car or on the side of a TV or some old random electrical equipment without knowing the... |
H: 12 V input to multiple 5 V outputs?
I have that project, where I have as an input voltage 12 V (lead acid battery) and would like to have 4 output of 5 V 1 A that would be switched on and off with a mosfet.
I'm thinking which way you would recommend me to proceed.
Option 1 : Use a single voltage converter 12 V to ... |
H: Compile time calculations in C
I have been implementing a control software in C programming language. One of
the software modules represents a communication table for some proprietary
communication protocol. Each record in this table has one item (among others)
consisting of 8 bits. This item represents properti... |
H: Using P-channel FET as switch
I'm designing a charger circuit. When the input (+5v) is available it should disable the booster regulator by setting Booster_en to low. I used a single P-ch MOSFET like below circuit. I added pull-down to the gate of FET for when there is no (+5v) it turns on the FET and Booster_en ge... |
H: How does a rocking arm voltage regulator work?
I am trying to determine the suitability of replacing a (ancient) rocking arm voltage regulator with a modern digital device.
I assume a rocking arm regulator has an electromechanical or magnetic feedback mechanism, but I have not been able to find a detailed descripti... |
H: Conversion from dBm to dB\$\mu\$V?
I am trying to derive the conversion from dBm to dB\$\mu\$V. So, please correct me If I am wrong.
\begin{align}
\textrm{dBm}
&= 10 \log_{10} \left( \frac{P}{1\textrm{mW}} \right) = 10 \log(P) + 30 \\
&= 10 \log_{10} \left( \frac{ V^2}{Z} \right) + 30\\
&= 10 \log_{10} \left( V^2 ... |
H: Display Amber/Orange on LED Strip with no control module?
I have a set of LED strips that have the following four wires:
Positive
Negative
Red Channel
Blue Channel
Green Chanel
Given these wires, I can produce the following colors without additional components:
Red
Blue
Green
Purple (Combine red and blue.)
Cy... |
H: Flux protection vs. sealed relay enclosures
When reading the datasheet for the Omron G5Q series relays, there are two options for enclosures: flux protection and sealed.
The price difference is almost a factor of two, with the former being the more expensive. Is there an application where flux protection is requi... |
H: What is the typical voltage of power distribution in rural North America?
I mean the electrical utility power that connects to the transformer outside of the home or other buildings. i.e. what is the primary winding voltage of the transformer having 220 VAC center-tap secondary?
i have heard as high as 13 kV, but ... |
H: In general, how do I know if my project needs a file system?
This question gives a good high-level overview of when an operating system is appropriate on an embedded platform. The three topics mentioned are networking requirements, GUI requirements, and file system requirements.
Networking and GUIs are obvious eno... |
H: Why we need to have a current output on power supply to drive some devices (such as curve tracer)?
Last week, I just had an experiment on lab, in which I need to use a transistor curve tracer board and thus was asked to connect it to a digital supply.
I connected them and sat voltage output of power supply as 12 V ... |
H: How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse?
simulate this circuit – Schematic created using CircuitLab
How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse ?
if no load => solar cells charges the batteries
i... |
H: Increasing Amp Output of a battery
So I have battery cells with a rated capacity of 3.5Ah and a nominal voltage of 3.5v Now, say I have a system that requires 12A for a period of 10 seconds. For this battery it is advised not to discharge beyond 2C or the efficiency hit becomes unreasonable. From my understanding, ... |
H: Find the best components and ICs
How do a newbie find the best components ? is there site or something ? the part number is not exactly user friendly. I know there are the classics, that I suppose improve over the years, but there are also modern alternatives...
AI: it depends vastly on what you are trying to accom... |
H: What PWM inputs are needed to drive a 3 phase BLDC using the HIP4086 IC driver chip?
I am building a motor controller for a BLDC (w/ Hall sensors) using a Teensy. My circuit looks like the typical application diagram in the datasheet (https://www.intersil.com/content/dam/Intersil/documents/hip4/hip4086-a.pdf):
My ... |
H: STM32 SPI not working as I expect it should based on online reading
I am using an STM32F103C8 to connect to a Hope RF95W transceiver IC for the purpose of learning.
I am only trying to read the chip version register, then write a config register that has a 0x00 reset value and then read it to make sure my write cod... |
H: Taking Quizbowl buzzers and connecting to a computer
Recently I Bought quizbowl buzzers from buzzersystems.com and the buzzers i received use an rca cable.
If you did not know basically, when you click a button, it sends a signal to a box which receives it and lights up/makes a sound.
Is there anyway that I can ... |
H: Missing soldermask on some pads of mcu
After designing a board in Kicad with an SMT32L0 on it, I sent it to seeedStudio and when I received it, I noticed that some of the pads on the stm32 are missing soldermask:
I checked the gerber file for the soldermask and there is no apparent hole in the stm32 pads :
I no... |
H: Voltage gradient across an antenna (and how it drives an AM radio)
Edit:
I was interested how is voltage gap maintained across an antenna. It seemed to me that an antenna might be like a wire where if there's a voltage at the top, the same voltage would be at the bottom, and hence no gradient and no current flow.
S... |
H: Antenna Design Procedures
I live in a residential area and I want to test and design an antenna in my garage. I plan on using my signal generator as the power supply and a RTL - RDS dongle connected to my computer as the receiver. The signal generator spans from 0 to 60 MHz. The amplitude has a range of 5 to 20 vol... |
H: Confused why outputs of a priority encoder could be X instead of 0 or 1
So this is the truth table given for the Priority Encoder:
and this is its logic diagram:
I am extremely confused with the part where the outputs x and y are labeled as X (where D0 D1 D2 D3 are all zero). First of all, how could an output be... |
H: Quantization: levels or intervals?
Assume a 2-bit midrise quantizer with (voltage,codeword) pairs (-3,0),(-1,1),(1,2),(3,3) where step size delta is clearly 2V. Now, calculating PSQNR using the intervals, we have 20log_10(V_peak/qnoise_peak) so Vmax = 3V or 1.5delta. Of course quantization peak error is delta/2 so... |
H: How does this fire alarm system transmit data on two-wire?
In the fire detection industry, analogue addressable systems use control panels and detectors (and devices such as interfaces) which communicate with each other by means of a protocol.
What protocol is this?
Can anyone help me find information about it?
AI... |
H: Removing/Subtracting Lead Resistance Using Op Amp Circuit
I'm working with RTD sensor, and need to use Op Amp circuitry.
Can someone explain to me how this Op Amp circuit work to remove the lead resistance?
So that Rw1, Rw2, and Rw3 vanish, hence the output from Op Amp Vout3 = IREFF * RTD
along with the calculatio... |
H: Supplying power to PCB with USB voltage (2.5V) regulator
I am designing a normal PCB board. I want to put a USB voltage regulator to supply my PCB. I don't need to design the voltage regulator. I just want to add it to supply voltage in my PCB circuit. The output will always be 2.5V (not more than that). Which USB ... |
H: Writing to FLASH on MSP430F5529
I am having some trouble writing to FLASH on the MSP430F5529. I have gone through the examples provided by TI and read through the user guides and part datasheet, but have been unable to find the problem. My goal is to save the baud rate enumeration in FLASH and look it up on boot. A... |
H: What does "off-state output terminal voltage" in optocouplers mean?
I was looking at possible options of what optocouplers to use in my project. I was looking at these parts.
https://www.fairchildsemi.com/search/?searchText=MOC3023-M#N=&&Nao=0&&Ntk=All&&Ntt=MOC3023-M&&Ntx=mode+matchallpartial&&Nty=1&&showAll=true&&... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.