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H: Current limiter for homemade arc welder
I'm would like to control the AC current that is will be consumed by a homemade arc welder. Website I used as a reference: http://www.mike-worth.com/2013/07/31/adding-a-current-limiter-to-my-mot-welder/
He converted a transformer to a rheostat (blue handle). I can't really ma... |
H: Adding a DC bias to an AC signal for amplification and measurement
I am trying to add a DC bias to this AC signal, but for some reason the schematics I found online for this do not work. The AC coupling is not happening.
I have simulated the circuit here: http://everycircuit.com/circuit/5315107213279232
Or screens... |
H: Mean time to failure (MTTF) of coreless DC motor?
What is a typical MTTF of a small coreless DC motor (e.g. 4x12mm) like the one seen here?
For a non-coreless 'toy' permanent magnet DC motor, the MTTF was shown to be in the 10s of hours at rated voltage, with MTTF decreasing exponentially as voltage was increased ... |
H: Audio mixing : crosstalk calculation
Here is an interesting article about mixing stereo.
Most important issues when mixing stereo are :
interaction between channel
crosstalk
noise
Interaction between channel is explained here in 1.0 with passive mixing, from that :
It would be possible to make the output impedan... |
H: Is there some kind of official standard for signal measurements?
Judging from this question, it seems that different people/sources have different definitions for measurements like amplitude.
I personally encountered people disagreeing on the definition of the rise/fall time, some stating that it should be compute... |
H: Need help DC biasing an AC source
I am trying to simulate this circuit I saw here:
However, when I simulate it, the "mid-point" does not behave like the blue line in the above picture. You can check the simulation here:
Is the original picture wrong? Am I missing something?
AI: You have connected the output of yo... |
H: Gap detector does not register high speed projectiles
I'm trying to build a gap detector-based ASG gun chrono. I successfully connected two gap detectors to Arduino Uno, wrote a program, which measures time between two voltage spikes (on each gap detector) and attached them to aluminium profile, such that ASG proje... |
H: What will be the output of opamp non inverting amplifier at 0v input
I have a doubt regarding an opamp non inverting amplifier.
I am using a dual opamp AZ4580MTR. One opamp is configured as a non inverting amplifier having gain 2 and the other is a voltage follower. The input of the opamp is connected from a DAC AD... |
H: Simple MOS current mirror bias circuit
Consider the basic MOS current mirror bias circuitry
I am really trying to understand on how Vbias when M3 is 'on' can be any other value other than Vt because M3 is diode connected (Vds= Vgs) and this means that the Vds of M3 will always be equal to Vt.
So all that I can va... |
H: Switching a relay from its supply (2 Relay Module, VCC to IN1, doesn't work)
I searched far and wide but couldn't find an answer to my question.
I've read the datasheet and I've look at schemes.
I'm not very experienced with electronics.
This is the module I will be talking about:
Let's say I apply 5V to VCC from ... |
H: Force sensor on uneven shape
I'd like to measure the force that a human leg impacts on a knee brace during normal gait. I have a problem in finding a suitable sensor for the job...
The leg (and hence the brace) are not flat at their contact surface and it seems FSRs change their response dramatically when bent... a... |
H: Need help in understanding miller plateau region
Will somebody please help me to understand what is role of Miller plateau region in switching of MOSFETs?
AI: MOSFETS have several regions of operation
(1) off, where Vgate_source ~~ zero
(2) on, where Vgate_source ~~ 5 volts or 10 volts
(3) building charge in the ga... |
H: Virtual Ground Paradox?
I'm unable to come to terms with something I think is a paradoxical situation relating to the virtual ground of an Operational Amplifier.Please pardon me if this is a really stupid question.
When the 'Negative Feedback' in an Op-Amp (Ideal) makes the difference between its input terminals eq... |
H: Any side effects when substituting bigger capacity battery in place of smaller capacity?
I have a car key fob whose batteries recently died. The coin slot says it accepts two cr2025 coin cell batteries.
But I was thinking, since a majority of coin cell batteries run at 3v, I should be able to simply substitute t... |
H: Anti-Static Soldering Mat - Makes hair stand on end?
I bought this (supposedly) anti-static soldering mat, because I was ruining my standard ESD mat when I would go to reflow things.
https://www.amazon.com/gp/product/B06X97Y379/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
When I received it, it made my hair stand on... |
H: Can I get all the energy from a PV system if it is only hooked up to a CC and batteries?
What I mean is that I know a charge controller regulates the voltage and current into your batteries to protect them (and CC's can incorporate MPPT's to extract more from your solar panels), but do the MPPT CC's take ALL the en... |
H: VHDL Simulation bug (am I losing it??)
I've got a simulation that simply takes an address as an input and 64 clock cycles later it simply outputs it on another port. For some reason, when I register the output data, it is not delayed by a clock cycle (see waveform). Is this some crazy part of the standard or did I ... |
H: What class of audio amplifier is this unusual configuration?
Regarding Figure 1 on page:
http://www.rason.org/Projects/transaud/transaud.htm
I'm trying to get my head around what type of amplifier "class" Figure 1 is. The last part of it looks like a Class AB or B amplifier, except that it uses two NPN transistors ... |
H: How to connect two circuits into on light bulb with a switch in each
I am not an expert. but I have two circuits, each on is 220v and both have a switch. I want to connect the two circuits into one light bulb. what I have to follow or need to know, To make this happens?
if any one of the switch turned on, the bulb ... |
H: How to create a zero crossing detector using a full bridge wave rectified circuit
Currently
1) I have a full bridge wave rectified ac waveform of 10Vmax.
2) I also have a potentiometer adjustable DC waveform.
3) My rail voltages are +12V and -12V.
4) I currently supply my full bridge wave rectified wave in to the ... |
H: MAX3485/MAX485 Low-Power Shutdown Mode
I am using a MAX3485 for Modbus communication through UART between a device and a Modbus server.
What I want to achieve is to put my MAX3485 breakout into low-power shutdown mode when I put my device into deep sleep mode.
The wiring my MAX3485 breakout is as followed:
DI/RO =... |
H: Linear power supply + zero-crossing detection on transformer secondary
Having read this comment, I'm a bit concerned about whether one of my projects is going to work:
simulate this circuit – Schematic created using CircuitLab
The comparator is also inside the uC, but shown explicitly for clarity.
The intent of th... |
H: MPPT for a load whose operating voltage is nearly equal to the solar panel's open circuit voltage
Is it possible to implement MPPT for a load whose operating voltage is nearly equal to the solar panel's open circuit voltage.
edit: Is it possible with buck converter alone?
AI: Yes it is. The MPPT converter will undo... |
H: Passing and overwriting parameters to Verilog modules
I'm studying the way of passing parameters from one module to another and I have one question.
I have this instance in the top level module.
parameter a= 100;
parameter b = 200 ;
test#(b/(a*2)) test(
.clk(clk),
.reset(reset),
.out(out)
);
In... |
H: FTDI chip returns descriptor of unknown device
I would like to debug the kernel of my nexus 5 and I sent to a fab the design for the debu cable that uses internally a FTDI chip that creates a USB to serial bridge.
Since the chip is a QFN package is a little bit annoying to solder but after some tries I done it; one... |
H: Shorting Triac gate to ground doesn't turn it off
In the below circuit, 170 is a Q401E3 Triac: http://www.mouser.com/ds/2/240/E2Triac-18233.pdf
The capacitors are ceramic disc.
The Triac is rendered normally conducting when S1 is open.
When I close S1 the Triac is still conducting when I don't want it to be.
I'm no... |
H: Time constant in an RC circuit
Is it possible for this circuit to have two different time constants? One from 0 to 30µs and the other one from 30µs. I tried to calculate the values and I get τ1=20µs and τ2=95/7 µs. They seem quite different so I want someone to confirm or tell me the right way to calculate them.
T... |
H: Minimum distance between inductor beads and an RF transceiver?
I there a minimum distance needed between the beads and the RF transceiver?
Like below ... the connections do not really matter, just if there are requirements regarding the distance between the bead and a nRF24L01 transceiver?
Through the bead MIDI dat... |
H: Liquid level switch with normally open contact
If something is described as a "liquid level switch", and contains a normally open contactor, would this imply that a dry sensor would cause the contactor to open, and a submerged sensor would cause the contactor to close? I get confused on the term "normally". To me, ... |
H: Are 12v power splitter cables device-agnostic?
I am looking at purchasing this power splitter for the purposes of powering several identical 12V/0.5A devices:
Henxlco Supply Adapter
The goal is to avoid a mess of "wall warts" and the corresponding proliferation of power strips throughout my office.
My questions:
C... |
H: Resistor needed for: Arduino Micro + 12V Pump + HF3FA/005-ZTF relay
I am using an Arduino Micro to turn On/Off a 12 V Water Pump.
I am using a HF3FA/005-ZTF relay --> Link
Here's how I connected everything:
I control it with this code:
const int GO = 12;
void setup() {
pinMode(GO,OUTPUT);
}
void loop() {
digitalWr... |
H: 50/60Hz Noise Harmonics
I want to wirelessly communicate over low frequencies (<1kHz), and I noticed during some tests that 60Hz noise is showing up a bit at 180Hz (3rd harmonic), and also slightly at 300Hz (5th harmonic): (Ignore the stronger signal I was transmitting)
Why are only the odd harmonics of 60Hz nois... |
H: Does the impedance of a PCB track matter if the length of the track is far smaller than the wavelength of the signal?
I have a PCB with tracks of no controlled impedance. The longest track is shorter than 1/5000 of a wavelength. Does the impedance of the track even matter?
If not, then at what length would I need ... |
H: Calculating VDS in circuit
I need to calculate the \$V_{DS2}\$ in the following circuit, but am unable to solve it. I know that \$I_{D1}=\frac{1}{2}k_n(V_{IN}-V_t)=0.4\$ mA and that with this value I can calculate \$V_{DS1}=V_{DD}-R_1 I_{D1}=1.5\$ V. But then I'm stuck, I think \$V_x = V_{DS1}\$ but \$V_{DD}\$ also... |
H: Raspberry pi 3 access point - broadcast power calculation / measurement?
Using hostapd to turn a Rpi3 into a wireless access point on 2.4Ghz
band.
How can I estimate the broadcast power of this AP?
PS adapter is 5V 2.5 A. P=IV = 12.5 watts, but, I think that's just
the available source adapter power and not real... |
H: Convolution integral for LTI system
We know that any continuous time signal can be expressed as follows:
$$x(t)=\int_{-\infty}^\infty x(τ)δ(t-τ)dτ$$
I came across a certain relation regarding linear time invariant systems . Using $$x(t)*δ(t)=x(t)$$ we get , since it's an LTI system : $$x(t)*δ(t-t_0)=x(t-t_0)$$
How... |
H: Dual gate driver inputs/outputs tied together
I'm using an IR4427 dual low-side gate driver to drive a single IXEL40N400 IGBT. Since I'm not using the second side, I'm considering tying its input to the active input and output to the active output for higher current availability and thus, I hope, faster switching.... |
H: MOSFET (N) On resistance much higher than datasheet under load
This is my first post on this forum and I am hoping to be much more involved in this forum. I am currently designing circuit that needs to switch a load of 200 mA by controlling its GND via a MOSFET (N). I chose a MOSFET with very low \$ R_{ds} \$ (On)... |
H: Confusion regarding component JUMPER-PAD-3-2OF3_NC_BY_TRACE
I am working on deploying a open source hardware project.In the list of components, they have mentioned one of the components as PAD-JUMPER-3-2OF3_NC_BY_TRACE_YES_SILK_FULL_BOX with value JUMPER-PAD-3-2OF3_NC_BY_TRACE.I tried to search on net but not a... |
H: Zener over voltage protection from DC hand crank generator
I have a board powered by a hand crank generator. Under normal conditions the voltage peaks at 18-20 volts. However spinning the handle violently will peak higher at 30+ volts. The generator runs through a schottky bridge rectifier and into a 5 volt regula... |
H: Speed of FPGA fabric
What limits the speed of FPGA fabric to Mhz range, while CPU pipelines are clocked much faster? Is it the interconnect delays that places a limit on signal timing?
AI: Reconfigurability comes at a steep price. Logic cells in FPGAs are complex, making them much slower than the equivalent (but no... |
H: convert TTL/CMOS output signals to 0V and 5V
Is there an easy way to convert TTL/CMOS output signals to 0 and 5V?
For example, if an ic outputs 0.1V as "0", I'd like to convert it to 0V and if it outputs something like 3.9V as "1", I'd like to convert it to +5V.
Thanks.
AI: Generally a CMOS buffer, or two inverters... |
H: How to find the data direction register given a port address?
I am writing a custom library for Arduino (for example using the ATmega328P). I would like to get the data direction register given an address of the corresponding port address. For example,
#include <avr/io.h>
DDRB = get_data_direction_register(PORTB)
... |
H: why boost PFC topology is the most used?
While searching about power factor correction topologies, the topology I came across almost all the time was the Boost PFC topology, and I'd like to know why? why is it the most widely used one, in comparaison to say, buck PFC or flyback PFC.
AI: Active power factor correcti... |
H: get dynamic length packet from UART?
I Write a program for receive data from Uart ISI, my Data Packet is something like :
2 first byte contain Device ID and type of command. Data is contain some bytes that could be have different length, minimum 1 byte to max 15 bytes, and the last byte represent the packet is fin... |
H: Increase low-frequency gain of a cascode amplifier
I've been designing a noise generator (for fun) with the goal of getting a smooth frequency response between 10Hz and 10MHz. Since I don't have any "fancy" op-amps, I decided to go with a discrete design that will eventually use a cascade of cascode amplifiers. I t... |
H: Should I do PFC?
I came across this question:why boost PFC topology is the most used?
Now I ask myself, should I do PFC too? My system is a servo with diode bridge rectifier and different current ratings. Very price sensitive.
So I thought, I can do a boost PFC in place of inrush current limit (resistor and relay)... |
H: Stability problem OpAmp and FET source follower
I just found this site and read a few great interesting articles but nothing that would solve my problem I am hunting since a while.
I have a OpAmp circuit with a N-FET source follower that regulates the current of some LED's. LED current is set at 700mA.
The ripple o... |
H: Full Wave Rectifier Efficiency
I was readings this article and extracted from it that "The maximum efficiency of a Full Wave Rectifier is 81.2%". Is that true, or alternatively is there some other fundamental limit on AC/DC conversion efficiency?
Since FWR is the canonical stage in converting AC to DC, does it sta... |
H: 50W LED with 10W power equal to 10W LED at full power?
If I buy a 50W LED and power it at 10W will it have the same brightness as a 10W LED at full power?
AI: All else being equal, yes. Of course, all things are never equal.
First, the lower-power unit will probably be physically smaller than the 50 watt, and this ... |
H: Radio clock sync circuit identification
I took out a little board from a radio clock that looks a lot like this one. I believe this is used for automatic clock setting - the coil is probably used as an antenna.
It looks like this:
The contacts on the far sides I believe are ground and 3V power supply (since the de... |
H: How much power does an FPGA use
Hello I have done a bit of research on google and on SE about how much power a FPGA uses and the answers are all unacceptable in my opinion.
Therefore I am going to ask in another way.
I need a generalized statistical analysis of the average power consumption to expect for all of my ... |
H: Is this a reliable circuit to monitor AC mains voltage?
I want to design a simple circuit to monitor AC mains voltage and take simple decisions if the voltage falls below a specific reference voltage.
It's important to mention that accuracy isn't an issue at all.
Circuit description :
The input voltage is stepped ... |
H: Verilog: Implementation Using Primitive Modules vs. Bit-wise Operators
The textbook I'm reading implements 1-bit adders using built-in primitive modules:
module yAdder1(z, cout, a, b, cin);
output[0:0] z, cout;
input[0:0] a, b, cin;
wire[0:0] tmp, outL, outR;
xor left_xor(tmp, a, b);
xor r... |
H: Are radio waves naturally polarized like light or is that a function of how they are produced?
I am thinking of let us say AM or FM radio being transmitted by a vertical antenna. Would the they be polarized vertically or horizontally and wouldn't the angle of the receiving antenna then determine the strength of th... |
H: Why put unpopulated components on a BOM?
I've ran into quite a few engineers from unrelated backgrounds that put unpopulated components on the BOM. Some will do a section clearly labelled DNP at the bottom, others will leave them dispersed throughout the BOM, but highlight the rows.
Having a DNP section seems like... |
H: Transformer with Single Turn Secondary in an Induction heater
I was thinking of a circuit which essentially has a series LC circuit connected in between an H bridge. There were certain things, I wasn't sure if I understand correctly, and would appreciate any input about it.
Neglecting the details of the L & C val... |
H: Is a current signal more robust than voltage signal from noise? Why?
I am trying to transmit a 3.3V digital signal over 20 cm distance. The problem is the environment might be noisy because of high current wire near it. I read that current signal is more robust than voltage signal. Does that apply to my case? and w... |
H: What 3-input logic gate is this?
I was experimenting with logic gates on my breadboard and tried a 3-input logic gate.
I got the following result:
Input | Output
A B C | ?
0 0 0 | 1
0 0 1 | 0
0 1 0 | 1
0 1 1 | 0
1 0 0 | 1
1 0 1 | 0
1 1 0 | 1
1 1 1 | 1
What logic gate could this be? Tha... |
H: Arduino-to-Arduino SPI unexpected characters
I've been trying to follow the posts on Nick Gammon's page which are admittedly a bit old, but seem to be everyone's recommendation for trying out Arduino to Arduino SPI. I'm able to get communications working, but there's a small issue I can't seem to pinpoint. Every on... |
H: Difference between cheap and costly DAC chips?
For same input parameters (resolution and sample rate) are costly DAC chips meant to produce signals closer to real world analog than cheaper ones?
AI: The resolution may be the same spec, but the "noise" will be different; that means the step-size will vary away from ... |
H: Wiring help for a DC LVDT?
I have a DC LVDT here with a built in signal conditioner:
http://www.te.com/usa-en/product-CAT-LVDT0004.html
I have a weak background in electronics, so I really have no clue who I'm supposed to extract signals from this sensor. Ideally I would want it hooked up with an arduino. Anyways, ... |
H: Raspberry PI, PCF8574AT, MPU6050, BMP180 i2c voltage difference?
I'm building a rpi 3 b+ based robot which collects data from a MPU6050 (Gy-521 breakout board, I power it with 5V), a BMP180 (3V input) and displays some data on a LCD via a PCF8574AT i2c converter (which I want to power with 5V, because on 3V the LCD... |
H: Why doesn't my 555 + MOSFET setup drive my motor?
I have a 3v motor driven by a MOSFET that gets its input off an inverter circuit that comes off the output of a 555:
The idea is that when you press the button, it waits for about 20 seconds and then starts the motor. (It's for a rotating banner that goes under a ... |
H: How does 16550 UART handle non-integer baud rates?
The 16550 UART calculates the baud rate using formula 115200 divided by the 16-bit number obtained by concatinating the High and Low DL registers. There are several well-known divisors that get you well known baud rates, and are easy to calculate. A baud rate of ... |
H: Is it safe to use a Peak detection circuit on a 200 V AC sine wave ?
I have an AC waveform of which I wanted to detect a peak. The application is to find when the AC signal is above some amplitude. The amplitude I want to detect is around 200 V.
I intend to use a peak detection circuit. Something like this:
Will... |
H: DC sweep analysis not matching transient analysis for amplifier
I'm building a little sound amplifier for something and can't quite understand why it's not a powerful as I though it might be. This is the circuit, and a simulated DC sweep is shown below:-
Vdrive is the meeting point of the output transistors Q1 an... |
H: VHDL assignment and condition at the same clock edge on parallel processes
Suppose that I have two processes in VHDL: One process is triggered on the rising clock edge and it is a state machine that sets a flag in one of its states. The second process is also triggered on the rising clock edge and it has a conditio... |
H: How does the current remains constant in an ideal capacitor?
In a tutorial given here, it is explained that the current remains constant upon sweeping the potential in an ideal capacitor.
Can someone explain in a descriptive way (in terms of the role of electrons) how it happens?
When applying a positive potential,... |
H: Is this solderable?
I have an Arduino Mega and one of the capacitors is broken off. It's the same as the one still attached (47, 25V, RVI) and the capacitor should be placed at location PC2.
I think this is SMD technique, anyway. My soldering skills are not high, I was wondering if I can solder it... since if it's... |
H: Calculation of ripple voltage after rectifier (equation from TAOE)
I am reading The Art of Electronics, Third Edition by Paul Horowitz and Winfield Hill but I feel like I am missing something when the book comes to talk about (begins to, instead) Power-supply filtering (Chapter 1.6.3_A, page 32) after a half/full w... |
H: Need to divide variable DC signal voltage
I have a CNC controller that outputs 0-10v PWM signal voltage for the purpose of controlling cutting spindle RPM (or in this case, laser power output). This is not the actual driving voltage, this is a signal voltage (I hope that makes sense).
My laser engraver requires 0-5... |
H: Connect signals to N.C pins in diode array (for ESD protection)
We created a circuit with diode array for ESD protection PN: IP4283CZ10-TBR (MFR: Nexperia)
Data sheet
As you can in the datasheet, there are some pins which supposed to be N.C, but we did connect them to the signal pins, as you can see here:
We afrai... |
H: IN-12B Nixie Comma Current Limit
I'm looking into using a set of IN-12B Nixie tubes in a clock design I've been working on.
If I tie my anode to the 170V striking voltage and use ~16kOhm to limit the digit current to 2.5mA then we're fine. However, I don't know how I am supposed to achieve the 0.3mA current limit f... |
H: How does modules in an asynchronous circuit know when to signal that their output is ready?
I have recently become fascinated by asynchronous CPUs, which have no central clock and each module instead sends a signal, when their data has been processed. However, I have been wondering how such modules actually know wh... |
H: Counter in assembly, using interrupt to prevent multiple counts with single push?
I am completely new to assembly, and I must develop a counter using PIC16F628A, a push button, and a display. Additionally it there will be an external oscillator (555).
I made some progress on this, but I think I need some help from ... |
H: Regulate, convert to DC and store current from home made AC generator to charge laptop
I am working on a small experimental project, learning more and more about electricity and electronics.
So, I have found this broken mixer and, surprisingly, it has a 300W engine with magnets that produces current when rotated. J... |
H: Difference between 2.4Ghz ISM and IEEE 802.11 frequency bands?
It may be a silly question to ask the difference between a frequency band and a standard protocol which is represented by IEEE.
But, I've been reading the wikipedia page of the IEEE 802.11 and it says that the frequncy band is 2.4Ghz ISM and i was massi... |
H: Powering 5V LED strips using 12V
I am planning on powering a set of RGB LED strips (I am leading towards APA102 https://cdn-shop.adafruit.com/datasheets/APA102.pdf). I know that, at full brightness, each LED requires 60mA. So, at 30LEDs/m, that is 1.8A/m, or (5V x 1.8A =) 9W/m.
I will be using 13m, and so I need... |
H: Adding a DC bias to an AC voltage at the base of a transistor
I came across circuits probably using an AC at the base to probably amplify it. I also came across the voltage divider to add a DC bias.
simulate this circuit – Schematic created using CircuitLab
Neglecting the values of the components and supplies. Is... |
H: 7408 AND Gate, Odd Behaviour
I'm putting together a simple DTACK circuit for a 68k homebrew machine, and part of that is requires me to know when either the Upper Data Strobe (UDS) or Lower Data Strobe (LDS) is asserted LOW. I've only got a few random ICs to hand, so I'm attempting to use a 7408 AND and driving the... |
H: Manual Demonstration Circuit for 74HC595 Shift Register
I am trying to create a manual demonstration circuit for a 74HC595 shift register. Se my circuit below. The problem I am having is that I am only getting a +0.7V signal to the data, clock, and latch pins of the 74HC595 when one of the buttons are pushed. The S... |
H: How can I Access Tiger Sharc DSP processor through host pc?
I am working on designing of a test board which involves both FPGA(Xilinx- Kintex 7) and DSP(Tiger Sharc) based signal processing.
Now the end user wants to access the DSP processor programming options/ boot configuration through the host PC itself. As I w... |
H: Contactor vs Relay
As known, contactor is used to switch higher capacity than relay. But there some relays can switch high current too, such as, some power relays can switch current beyond 100A, and there are contactors to switch only 160A. So, if a relay has a same switching current with a contactor, which one to ... |
H: Powering DC 5v 120w from AC 110v
I would like to power a large set of LED strips. Doing my calculation, at maximum output, I would require 120w at 5v. I am relatively new to electronics, so please excuse the noob question.
In my research, I have found significant limitations in what I am trying to do. I have not fo... |
H: 18V/5W solar panel to trickle charge a 12V car battery?
I'm running a small Arduino project out of an old 12V car battery (that was on my car since 2008 till 2015).
I also have a 18V/5W solar panel.
Can I connect them together so the solar panel charges the car battery? The Arduino project is really really low on ... |
H: Can't understand concept, range of the pulse (waveform)
I am working on the lab which is allowed to ask other people for hints.
In the image, program called "Audacity" is used to capture that waveform.
Question 1
In the image it says, "The peak-to-peak span of the signal is about 2.0 V"
It says its span range is... |
H: Capacitor with Current Source in parallel with a resistor
[![enter image description here][1]][1]
I know that in a current source in series with just a capacitor (without the parallel resistor), it would charge until forever in an ideal case with the fomrula
I= (dV/dt)*C
but in this case since it is in parallel, th... |
H: Why is it not possible to measure voltage between one battery pole and ground?
If a DC multimeter is attached to the plus pole of a battery and the other pin to ground, then in my understanding there is a positive potential on the positive battery pole and a zero potential at ground. Shouldn't the multimeter show t... |
H: Input Current to Output Current for a step-up voltage regulator?
I am buying one of the many step-up regulators available on Amazon, the Icstation 2577.
In my project plan, I will be using either a 150mah or 300mah 3.7V 25C lipo battery. I will be stepping that up to ~5V and drawing between 1-1.5A on the 5V output.... |
H: What is the impact of package on SMD capacitor
Most of electronic component exist in different package for different reason, it can either be power rating, reachable value, power dissipation... As far as I understood, the size of resistor principally impact the power rating.
So, a 1kΩ resistor in a 0805 package w... |
H: AP4306 has paralleled two op amps in it's block diagram, is that possible?
Thank you for taking some time to read this. I've recently come across a nice constant voltage/current source (http://www.mouser.com/ds/2/115/AP4306A_B_C-271586.pdf) called an AP4306. Upon reading its datasheet, I was interested in the fac... |
H: Why does my GPS and Wi-Fi work inside a sealed copper clad box?
I have just finished assembling a Raspberry Pi-based project into a DIY box made from copper clad FR4 PCB, with the edges soldered together and the copper surface connected to ground.
I expected, when I put the lid on the box, the onboard Wi-Fi and the... |
H: Understanding Transceiver vs buffer
Using this OctoWS2811 as an example, when to use a transceiver vs buffer?
It uses an 74HCT245 (bus transceiver) with the direction tied high.
Why not use a line driver like 74HCT541 (buffer)? Specs look very similar other then a few nanoseconds here and there.
AI: They could use... |
H: Why does a BJT enter saturation?
I'm a beginner in EE, learning about the forward active mode of transistors. The equation, Ic = Ib * BETA, and Ic=Ie * ALHPA, are referred to as the ways to figure out what base resistor you should have when running forward active mode. What is Ic and Ie? Do these mean the amount i... |
H: Should I use resistors for LED
Hi all,
This might be possibly the silliest question you have come across, but its bugging me out. Recently i have bought a 1Watt LED and when enquired with the vendor, he informed that the allowed max voltage is 3V.
So I was thinking that if I source three LED's in series from a 9V... |
H: question on diode in the Energy storing circuit
Please consider the following circuit.
For this case, my following notion is correct?
When v(t) is greater than diode turning-on voltage (v_d), the forwarding current (i_d) occurrs, and then energy will be harvested.
When v(t) is less than v_d, i_d is zero, and then... |
H: A problem regarding connecting the grounds within two seperate circuits
Figure 1
I am trying to design the above circuit for my project to create zero crossing detector as shown in the above figure. This configuration was proposed originally by the member named "Transistor" in this community.
But the problem is I ... |
H: How to correct Warning : array subscript has type 'char' [-Wchar-subscripts]
Hi I write a function to reset a Character Array in Atmel studio as below:
char PacketData[50];
void Reset(){
for (char i=0; i<=50;i++)
PacketData[i]='\0';
};
But Always get warning when compile the program:
Warnin... |
H: Adding a constant load to the input of an Opamp
I was looking at this circuit, and there was a resistor connected to ground after the output of a signal generator(50 ohm on the top left) . The explanation was that adding it allows the signal generator to see a constant load. Note: On the right is an op-amp.
Can s... |
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