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H: Microprocessor & sub 2.4GHZ transmitter for underwater application
I am looking for a device that has following properties:
Can transmit data underwater (sub 2.5GHz,1-2m below surface)
Very small (max. 15mmx15mmx2mm)
In-built microprocessor
Able to read sensors
So far I found the XBee, which is too big, and the B... |
H: how to modify TNY264-based smps for different output current?
In one of the reference applications for the TNY264 switcher, we can see the following circuit.
and in part of the circuit description we read:
... The output voltage is determined by the
sum of the optocoupler U2 LED forward drop (~1 V), and Zener
... |
H: Configuration problem with pic16F877A
I am building a program for a PIC16F877A. It seems to be running correctly in the simulator MPLABX. I'm using about half the available program and data memory.
During programming I receive the following message:
The following memory area(s) will be programmed:
program memory: s... |
H: Can a failed write to Read/Write partation on SD card cause corruption of a Read Only partition?
I have a project that uses a raspberry pi zero where the power will be cycled unexpectedly, so I configured the filesystem as Read Only. I also have a small amount of data that I want to update every few minutes, which ... |
H: Why anode attracts Anions if anode is positively charged and anions are negatively charged
Why does anode attract anions if anode is positively charged while anions are negatively charged ? Same is with cathode ...cathode is negatively charged and attract positively charged cations ..why is it so?
AI: I did a searc... |
H: Driving a 5A current through a coil
To many electronics engineers this might seem a stupid question but I was given by my boss the task to find a solution to drive approx. 5A through a coil.
The coil's resistance (not considering inductance which would be ~15mH) is about 90 Ohms. The signal is sinusoidal with a fre... |
H: Efficiency of obtaining differential signalling from a single-ended manufactured transducers
This will be a conceptual question. I'm sometimes dealing with data-acquisition of transducers, like strain gauges, accelerometers ect. sort of sensors.
Most of these sensors have their own precision amplifiers. So what I m... |
H: Why are many IR receivers in metal cages?
I'm guessing it's a Faraday cage around the receiver, but don't know why they might need one. Is there some sort of common interference around 38kHz (their operating frequency)?
It's the only component I think I've used that gets this special treatment. A larger cage may b... |
H: Input circuit for GPIO of a 3.3v tolerant microcontroller
The micro controller I'm using detects Low for 0-1.8v and high from 1.9-3.3v.
The level I need to check is if the input if from 0v-5v stay low, 5v-24v go high on the micro-controller pin( above 1.8v).
I cannot use a Voltage divider here as the high range has... |
H: Choosing an equivalent relay
I have to replace a faulty SPDT 895-1C-C relay so now I'm looking to buy the product. The problem is that this model it's not the most popular in the world so I thought that I might use something equivalent instead.
I wrote a list with few properties that I consider are important when s... |
H: Is 'grounding a desktop PC via 1MΩ resistor' unsafe when working inside the case?
Activity: maintenance (installing/replacing hardware parts, like motherboard, CPU, DIMMs, graphics cards) inside an ATX case. Goal: ESD protection and user safety.
Original question: Is 'grounding a desktop PC via the power cable' sa... |
H: NE555P Frequency Drop to 0 after a couple of minutes?
I'm trying to build a frequency measurement circuit using NE555P and Atmega328P. The circuit is the following :
I use this library https://www.pjrc.com/teensy/td_libs_FreqCount.html
Always, The system works fine at the beginning (3 to 4 minutes) and then the fr... |
H: A question on Vb Ic characteristics of an NPN transistor
I wanted to plot a Vb Ic curve of an NPN transistor in LTspice as follows:
Vbe is swept from 0 to 2V.
But all the tutorials I encounter shows this curve as the following:
Why in this characteristics they always omit plotting the settled part(I guess the sat... |
H: Is there a simple way to transform an analog signal into its first derivative?
I have an analog signal in the range 0.5 ~ 4.5 V. I'm less interested in the signal's absolute value than I am in its rate of change. Is there a relatively simple passive circuit that I can put between the signal and an ADC that will do ... |
H: What are the extra microstrip elements on this RF amplifier board for?
I am planning to build an amplifier with the HEMT CGH40010. In its datasheet (http://www.wolfspeed.com/downloads/dl/file/id/317/product/117/cgh40010.pdf), there is a picture of a evaluation kit on page 8, and an even better picture is on page 9.... |
H: Do dual-supply switch ICs provide DC Offset internally?
I am using analog switch ICs for the muting of audio sources, and am looking for some clarity on what I think I understand about them.
Below is a simplified comparative schematic of how I believe these switches can be used to yield the same function.
Where I ... |
H: What control scheme do ESCs for RC planes use?
I have just built an electric skateboard based on a Hobbyking 50A ESC, controlling a 400Kv outrunner-type brushless motor. The skateboard requires a little nudge at the beginning to run regardless of the speed setpoint, otherwise it struggles and vibrates. This is not ... |
H: Relays: understanding "Rated carry current" and "Maximum contact current"
I'm trying to understand the limitations of connecting multiple relays, and how it relates to current.
Consider a relay with the following specs (rounded for easier math):
Rated current: 100mA
Rated voltage: 12V DC
Rated carry current: 3A
M... |
H: Replacement for uknown broken transistor - bipolar or MOSFET?
I try to repair the receiver board of Syma X8 series quadcopter. One of four DC motors is not drived properly, i. e. does not turn on after the signal from transmitters (the other motors do). The motor works if it's connected to other outputs.
Using an ... |
H: Oscillator circuit analysis
I am working on an oscillator circuit. Here's the diagram [See below for output diagram]:
Since it's a bistable circuit I will have to assume two separate conditions that each transistor might be in. Here's my analysis.
My solution:
First, I assume Q1 is saturated and Q2 is cut-off. The... |
H: Using register retiming to pipeline a module
From my reading I understand that modern synthesis tools are able to perform register retiming where registers are moved between combinational logic to meet timing constraints.
So for example in your HDL you would describe comb -> reg1 -> reg2 -> reg3 and the tools would... |
H: Chosing the right motor for a vibration platform
The following photo depicts a vibration testbed that uses a motor, springs and some wood. The purpose of this effort is to make a test bed vibrate the attached kinetic energy harvester at the movement frequency controlled by the motor.
The vibration plane is connec... |
H: What kind of IC is "ATMLU324" "16B 1" "Z8J0534B"?
I recently bought what I thought it would be an ATtiny85. After a few unsuccessful tests, I discovered (guess what?) true ATtiny85 had "ATtiny85" printed on it, like this one:
Mine is this one:
The printing says:
ATMLU324
16B 1
Z8J0534B
I searched for a datasheet... |
H: What can you put in a cable to lower a voltage from 5V to 3.3V?
When charging an iPod shuffle using this cable, https://www.google.com/search?q=ipod+shuffle+charger&client=ms-android-verizon&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi9odvBqoHTAhVlxlQKHTpTBcIQ_AUICCgC&biw=360&bih=559# , one typically plugs the ... |
H: How to generate complementary PWM signal using an IC (integrated circuit)?
I am outputting a PWM signal, but the problem is that I can't generate a complementary PWM signal with dead time because this timer channel doesn't support it. So I want to use/buy an integrated circuit (IC) that generates a complementary PW... |
H: Can I use TRIAC dimmer output AC rectify to DC
I am playing with TRIAC dimmer from past few days, by firing TRIAC at different phase angle the overall output can be lowered.
but i was thinking if i can use a diode rectifier and a filter capacitor to get DC out of the Dimmer. I know it will be a non isolated topolog... |
H: Second Reflow with BGA
For a DIY project BGA reflow soldering is really expensive to get it done by commercial means. I approached a university which allowed me to avail the help of their staff but they said they would only do the BGA part.
I thought of getting the other parts done through commercial means since th... |
H: Bypass capacitor vs low-pass filter
i'm trying to get my head round two intermingling factors relating primarily to an rc low pass filter and bypass capacitors for providing a low impedance path for high frequency AC signals, essentially filtering them out.
I was initially confused by the need of a resistor within ... |
H: Spark when connecting battery module to DC power supply
I am using a 60v DC power supply to charge a 48v battery module. I set current and voltage limits first, turn off the DC power supply, connect positive to battery's positive side. When I try to connect the negative side there was a spark, I wonder why it happe... |
H: BLDC PWM frequency
I am driving a BLDC motor using a 6-step commutation table at a 40kHz PWM frequency and I am at a loss choosing the optimal one. I understand that the max frequency depends on the motor's R/L ratio and the MOSFETs's dead time.
According to my motor's datasheet:
the phase to phase terminal resis... |
H: A mechanical switch current/voltage rating
I have a mechanical switch, and it has been rated 5A at 125V, and 3A at 230V.
I think it is not because of power, because 5*125 is not equals 3*230. Why does the current rating change depending on voltage?
Both ratings are for AC
AI: When a mechanical switch is turned off ... |
H: How does this circuit control motor speed?
I was curious to see how the foot pedal of a sewing machine drives the universal (?) motor inside the appliance. I had expected a simple variable resistor like the ones in vintage machines but that's not what I found. My experience is limited to digital circuits, so I woul... |
H: What's the difference between the LM2917 and the LM2917-N?
The schematic I'm looking at says to use an LM2917. The specs from the TI site use both LM2917 and LM2917-N and the shop on ebay uses both names too.
http://www.ebay.com/itm/like/270864373784?lpid=82&chn=ps&ul_noapp=true
http://www.ti.com/lit/ds/symlink/... |
H: How can I modify this switch?
Power > toggle > light > extension plug
When the toggle is ON there is power to the light and power to the extension's plug
When the toggle is OFF there is no power to the light and no power to the extension's plug
How can I make the light so that it has power when there is NO toggle... |
H: STM32 clamping diodes - what is the maximum input voltage?
As you can see on the attached picture from a reference manual of STM32F7, GPIO pins have internal clamping diodes to protect from overvoltage.
But what maximum voltage can I put into the pin? I know that 5V is max, and 4V is max for VDD. But what would ha... |
H: How does armature reaction affect brushes in DC generators?
"Due to armature reaction, the natural direction of the magnetic field of the poles is distorted. Thus the neutral plane is also altered. Therefore, the armature conductors are not at zero potential when they come in contact with the brushes. This leads... |
H: Current gain in MOSFET CS Source degeneration
There is always some formulas for calculating "Au" or "Gu". But there are never given any equations that reffer to current gain in MOSFETs. I know current gain is almost infinite in normal CS amplifier, but can that value be shown as an equation?
And what happens when "... |
H: Why is my sound level LEDs bar indicator not working?
I want to amplify a microphone signal and use the output to drive a speaker and an LEDs bar, all works nicely except for the LEDs bar:
simulate this circuit – Schematic created using CircuitLab
The LEDs bar is supposed to change level (number of illuminated LED... |
H: Why is transistor needed when using a relay?
I will start building a relay based on this answer:
https://electronics.stackexchange.com/a/464345/56969
Why is T1 needed? Every other component has an important purpose. But does T1 has an important purpose as well? Can I just remove it?
What would happen if I remove t... |
H: Why a capacitor is connected between two ground terminals and what difference does it make?
I was referring to a datasheet where I found a capacitor is connected between two ground terminals. Are these really ground terminals or am I reading the datasheet in the wrong way? Can someone help me to understand what thi... |
H: Why shows the effect shown in the video below left-right asymmetry?
I made this video which shows what happens when I move the point of a wooden chopstick over my TFT-LCD screen, with firm pressure.
It's remarkable that one can see that there is a difference between moving the chopstick to the right and to the left... |
H: A warning on power pins of MCUs, explanation?
I came across with this warning:
Most Chinese development boards do not have any kind of protection on
the +5V rail. This means that the +5V pin of the USB connector is
directly connected to any +5V/VIN pin on the development board. Always
check if this is the ca... |
H: Female terminal pin
What is this female terminal pin called, Everywhere I look I can only find slightly similar ones, but no matches, Even a reverse Google Image search pulls up some weird alternatives
The only ones I can find are these
I need this specific type because the lip at the end of the female termin... |
H: Required timer count for a number of same frequency different duty cycle PWM signal
Ok, it may look a bit confusing. I am specifically talking about STM32 MCUs, or even more specific, STM32F103C8T6. I did some amount of reading, but could not find the answer to this.
Let's say I want 4 PWM signals each at 50 Hz but... |
H: LM317LM as a current source
I have been using LM317L as a current source for generating 2-50mA current for a load, by following the datasheet, P14:
So far so good, but now I have come across LM31L-n, particularly LM317LM/NOPB, which also comes in 8-Pin SOIC form which in the datasheet states that 4 of the pins are... |
H: How can I trigger an AC output ON when an AC input is OFF?
I have a low power 24V AC circuit powering some motorised ball valves for switching water on and off. Several of the valves are 2-wire auto-return meaning that presence of an AC signal will open the valve, and absence of an AC signal will close the valve (i... |
H: Which formula is correct for a Digital-Analog-Converter?
I am looking for the formula for an ideal DAC: a device that takes in a digital code and returns an analog value
rfwireless-world.com claims
$$V_{out} = D\cdot V_{ref}/(2^N-1)$$
where D is the digital code and N is the resolution of the DAC.
However, science... |
H: Do I need to put a resistor in series with relay coil?
I need to design a circuit to drive a relay and I have some doubts.
Do I need a resistor in series with relay coil, I mean, between
transistor and relay coil ?
Why I always find relays with 12V, can I use a 5V source to energize the coil?
Unfortunately, I d... |
H: Understanding the operation of LM219 Comparator
I'm trying to use the LM219 (equivalently LM119 or LM319) comparator in a project I am working on (I chose this over other comparators because it has a fast response time for the desired supply voltages). I am using supply voltages of +-12 volts, and I am generating a... |
H: Zero Crossing Detector using comparator
I followed SNOA999 for a zero crossing detector using TLV7011 as a comparator. I am not sure about short-circuiting grounds between AC and DC power sources. My concern is creating negative currents on the DC side and thus damaging some more sensitive components.
I tweaked the... |
H: Capacitor does not hold charge when switching power
I'm trying to create a power source switch using a relay. This's supposedly will be used for my Raspberry Pi. So what I want to do here is :
Create a backup power source with battery that will replace the main power if it's failed/off
Add a capacitor to holds cha... |
H: Basys 3 400MHz Logic
The Basys 3 advertises "internal clock speeds exceeding 450 MHz," but the default clock pin is connected to a 100MHz oscillator. Is it possible to configure the Basys 3 to use a 450MHz clock?
AI: The circuits on the board have internal PLLs. These are blocks that can generate a signal (like a c... |
H: How to drive the gate of a MOSFET with a PWM like signal
I'M trying to use MOSFET as a driver for my 10W LED with 12V supply. This LED will be used as a transmitter with signal coming from Arduino nano. I'm using IRFZ44N MOSFET with a Vgs(min)=2V and Vgs(max)=4V. The problem is whenever I give the transmitting sig... |
H: Why do I need phase margin if I know the transfer function?
What is the point of examining the phase margin (or gain margin) for a closed-loop system if I can just solve for the transfer function. The transfer function will give any poles and zeros, which can be used to know if your system is stable, the step respo... |
H: Is there a component that will OR the last 1-2ms of its input?
I need a component/circuit which will output 1 if a 1 has been input at any time in the last 1-2ms.
I could make such a circuit out of several shift registers, an oscillator and several OR gates, or I could use an MCU.
Is there a simpler (maybe analogue... |
H: Button debounce ringing
I have a circuit where I am using a tactile switch to pull 3.3v down to ground and investigating debouncing the button. My relevant part of the circuit is
The 100nF cap does work here my signal has ringing that operates in the undefined region and causes a few false clicks. Increasing the... |
H: The meaning of leads in equivalent resistances
Following on this question (How to combine two resistors with a voltage source) and faced with a similar example, it would seem the opposite applies. I am given the circuit below:
simulate this circuit – Schematic created using CircuitLab
and told Rth is (R1||R2)+(R3|... |
H: Altium->Coupled Inductors
Im glad to be with you. I have question about coupled inductors in altium. I want to make a flyback converter and tried first as in Image 1 . I converted 310V DC to 12V DC as you can see. I wrote spice model for T1(Transformer)
Then, I wanted to ascend my outputs as you see in the Image ... |
H: Why should the smallest bypass capacitor be placed nearest to the IC?
I have found and read many papers about bypass capacitors, but there is still one thing I am really struggling with. Let's say I have an IC and I place 3 bypass capacitors (eg. 10µ, 1µ and 100n). I am familiar with the idea that the smallest shou... |
H: Why are tapped transformers needed in RF amplifier circuits?
I'm not really sure why, but I have seen many different RF circuits in which the input to a transistor is taken from a center tap instead of across the entire secondary, such as this example:
Why is the input taken from the tap instead of across the enti... |
H: Is ther a standard circuit/component to control the temperature 500W resistive heating element from a PCB?
I have a 500W (230V) cartridge heater element and a K-type thermocouple. I want to use the feedback from the thermocouple to be able to vary the temperature of the cartridge heater. I have no concerns about be... |
H: What is 1.5%rdg + 4dgt for 15,23 V?
Where "Rdg"is for reading and "dgt"is for digits.
So, 15,23 * 0,015 = 0,22845.
Rounding to most significant digit it's 0,2.
So is this correct?
$$15,23 \pm 0,2$$
Since 4dgt is smaller we ignore it. Or am i doing this wrong? I need to find uncertainty in the way I did for a physi... |
H: Voltage induced accross an inductor, conceptual confusions
simulate this circuit – Schematic created using CircuitLab
OK, I always have a hard time to understand inductors. Now, I do know that inductors will not let current through them to change instantaneously. And the voltage induced across them is given by the... |
H: How to obtain a Norton current (I_N) with resistors in the way
How is the Norton current I_N (over the red terminals) obtained in a circuit where the introduced short cannot return to a given current source I without going through some resistance.
simulate this circuit – Schematic created using CircuitLab
EDIT
The... |
H: Thevenin's theorem
So I watched a couple videos on Youtube about Thevenin's theorem and I found 2 ways to do this circuit,but I get two different answers and I'm confused now.(for finding \$V_{th}\$)
First method is
\$V_{th} = (V_s/R_1+R_2)R_2\$ and i get 24 V
The second method is using KCL
so, \$I_1-I_2+I_3=0\$... |
H: How much time to I have to switch outputs on a CD74HC4067 multiplexer?
Looking at this datasheet, how do I determine the amount of time I have to switch between one connection and another?
It seems that as I switch from one connection to another I will go through several intermediate states as my software sequentia... |
H: Controlling Proportional valve with NPN transistor (TIP 122) using PWM
We are working to control the proportional solenoid valve (9C, 2W) (VSO by parker, datasheet) by changing the voltage across it. For this we are using PWM from the controller, thus changing the average current across the valve.
The controller (... |
H: Converting a 4-20mA 24V signal to 0-5V?
How do I convert a 4-20mA 24V signal to a 0-5V signal, suitable for A-D conversion with a 5V microprocessor? Can this be done while isolating the 24V from the 5V output?
AI: The simplest way is to use a 250 ohm resistor and remove the offset digitally.
To get an isolated in... |
H: Is there a convention as to placing a resistor before or after an LED?
We know that it makes no difference whether a resistor is placed "before" or "after" an LED in a circuit.
Changing the resistor to be in front or behind an LED doesn't affect brightness?
Does the resistor have to be before or after the componen... |
H: How to simulate two 12W lightbulb in series to 220VAC?
How can I simulate two lightbulb of 12Watts in SPICE?
In proteus simulation, there is only a lamp of adjustable nominal voltage and resistance. The default is 12V nominal and 24ohms resistance. If I want to simulate two light bulbs(12W) in series to 220VAC, am ... |
H: Tantalum Capacitor Explodes When Engine Starts
I designed a circuit using a SMPS voltage regulator based on the tps65261rhbr triple synchronous buck converter. The circuit is rated for up to 18V. It is connected to a 12V lawnmower battery, which also starts and powers a gasoline engine that returns charge to the ba... |
H: Could Cat5e be used for RS485
I'm working on a project that will be using RS485 to communicate between a bunch of modules and a master controller. Low baud rate, 9600, but a decent distance, like a couple of hundred feet. I'm wondering if I can get away with reliably using Cat5e for this, and whether or not I need ... |
H: Short Circuit Output Current - IC Definitions
What does "Short Circuit Output Current" mean? Does it mean that the voltage output will be to 0V at this specified current? So what would be the maximum current sourced without having a large impact on the voltage output? There is no graphic, it would be nice to have t... |
H: Floating ground when mosfet is off - is this a good design choice?
I am designing a simple circuit for weight controller and I am not sure where I should connect the drain of N-channel mosfet. My goal is to design a circuit that when powered off (both when button BN1 and pin B6 are low) should be inactive and drain... |
H: Equivalent baseband communication channel
I was reading on my lecture slides (I do not put them here since they are not in English) this statement about equivalent baseband channel models:
In typical wireless applications, communication occurs in a passband [fc W/2;
fc
+W/2]
of bandwidth
W around a center frequenc... |
H: Identify this SMT device
Can anyone tell me what are these smt devices. Especially the one with square drawn at centre
AI: They are zero ohm links. Maybe mainly used as jumpers on this single sided board to allow for a track to run under them, but they have other uses, see What is the usage of Zero Ohm & MiliOhm Re... |
H: If two identical transformers are connected in parallel, referring to LV(secondary) side, any change?
Assume transformers are 10/0.4 kV 500kVA transformers. Primary is high voltage side and secondary is the low voltage side.
Normally we do Z_secondary(LV) = Z_primary(HV) * (Vrated2(LV)/Vrated1(HV))^2 to refer imped... |
H: Clearance and creepage for AC Optocoupler for 230V line detection
I was wondering how I need to handle clearance and creepage in this scenario.
It's AC mains line detection circuit.
I need to achieve around 2.5mm creepage.
AI: I also posted the question on reddit and got the answer there:
So a few things before t... |
H: How to bond flex to rigid pcb
I have a rigid PCB and a flex (4 layer) PCB. I want to bond them instead of using a connector (although if what I am expecting is impossible I will use a connector).
What methods are available for bonding a flex to the surface of a rigid PCB? Can we back them with solder like an SMT co... |
H: How can I determine what type of logic structure this circuit represents?
I have the following circuit:
How can I determine which one of the following functions it represents:
F = (AB+CD)'
F = ((A+B)(C+D))'
F = AB+CD
AI: You can determine the functionality by analysing which transistors are controlled by which in... |
H: Calculation of MOSFET gate drive current
I know that there have been many posts on this topic, but I'm confused about calculating the gate current of a MOSFET.
I have calculated the gate current as Igs = Qg/t. For example, I want to drive IRF540n with PWM at 100 kHz. It has Qg = 94 nC and 100 kHz = 10000 ns.
If I u... |
H: Characterising an Audio Isolation Transformer
Rummaging around the junkbox in an effort to find a 600:600 ohm audio isolation transformer, I found a possible candidate rescued from a store closure some time back. It's basically a cheap, low power unit that looks something like this:
Unfortunately, it came without... |
H: Continuous Reset generated by LDO to Microcontroller
I have the below schematic
Datasheet of the LDO - L4995 -SSO24 package
LDO Specification :
Input Voltage : 12-16V
Output Voltage : 5V
Load Current : 100mA
Issue :
My LDO is generating RESET pulses continuously.
Objective:
I am trying to program my microcontrolle... |
H: How to connect photo diode to trans impedance amplifier?
transimpedance example here
I need to design a trans-impedance amplifier to amplify the signal from a photodiode to make a PPG sensor
I need a signal to acquire from the wrist.
photodiode I am going to use is SFH 7060
I don't understand how to connect anode... |
H: I2S Data Structure (Inter-IC Sound)
There are tons of electrical descriptions of I2S; however, I cannot find information about how the data is formatted/structured. What I mean by format is, what does a value on the serial data line mean? Do these values have information on volume, pitch, or something else?
As an a... |
H: What is wrong with my buck regulator circuit using the RY8310 IC?
A component in a larger circuit I've designed is a step-down regulator circuit. It provides an output voltage of 18V from an input of up to 29V. For no other reason than the PCB manufacturer had it in stock, I chose the RY8310 buck converter.
I read... |
H: Lithium-ion battery charger using LM317
I have come across the following circuit in a datasheet for a battery charger:
I have also seen a similar use of the charging circuit for use as a lithium-ion battery charger, e.g. here.
But is this circuit implementation actually suitable for a lithium-ion battery? (I know ... |
H: Calculation of switching transformer at 100kHz
I am not able to desgin transformer for switching frequency 100kHz. It´s easy to desgin usual transformer for 50 Hz. But I´m totaly out when comes to switching transformers. What material should I use? Im not sure if Ferrite core E55 is enough.
My desired parameters is... |
H: Why does a channel need to have bandwidth requirement for digital data transmission?
I'm not from EE background and try to understand how digital is sent in a channel as a non-technical audience.
Let's say we use fiber optics to transmit digital data 010101....,
Since fiber optics use light to transmit information,... |
H: Will AC switch work for DC
I have a on-off switch that'll use for a kill switch for my car using the gas pump. The switch says 6A/125V 3A/250V 22 AWG.
For my purpose it needs to handle 12V 20 Amps max.
AI: You cannot use a 6A switch with a 20A load. You may also run into issues with lower voltage rating at DC, but... |
H: Real consumption of SMD5050 Led Strips
I'm building my home lights with an SMD5050 Led strips.
And I'm completely lost after comparing specs consumptions with real measured data.
So on, I have 5 stripes and 1-to-5 Splitter from my controller:
2 legs for 10m each, both sides fed from the splitter.
5th one is single... |
H: Why this Plier is advertised with conductive handle?
See the product here.
Ok, I cannot think why I would want the handle to be conductive. What is the deal?
AI: The handle is "dissipative" so it's very slightly conductive and won't allow charge from the user to damage the components (and they won't allow a live c... |
H: Questions about coil voltage and phase shift in the WPT system
I performed simulations of wireless power transfer in matlab simulink. It was powered with DC voltage which was then converted into a rectangular voltage with a frequency of several dozen kHz. The figures show a schematic diagram and a graph of the volt... |
H: I would like to know if the circuit is correct?
simulate this circuit – Schematic created using CircuitLab
I have used the voltage follower concept in order to keep the output logic non-inverted.I would like to know the issues that I might have if I connect the output pin to the micro.
I am aware that the output ... |
H: Should via use be used when it is not essential?
I am working on characterising a transistor at approximately Vds=1000V and Ids=100A pulsed at around tON=20ns.
Should the power and ground paths (Top and Bottom layers) have vias connected to the respective groundplanes? Will this reduce signal integrity?
From my kno... |
H: Help Identifying Inductor From a Schematic
I’m repairing a laptop but I don’t know what value inductor to use/get. The schematic has values, I just don’t know how to interpret other than it’s a 2mm inductor. It’s labeled 5A_Z120_25M_0805_2P on a 1.35V line.
AI: Looks like something with 120 Ohms Impedance (z120) at... |
H: Explanation for parallel darlington behavior
I've built and simulated the circuit below in real life, LTSpice and Stack-Echange-Spice. It behaves in a similar fashion in all of these Environments. When the "LAMP2" load is disconnected, the Base currents become unbalanced, with most going through Q2 - This, in turn,... |
H: Identify the symbol
This probably has been asked a bunch of times but I couldn't find anything with image search.
The component is designated as R1 and the only other piece of info is 500mA written on top of it. It is placed right after the power input. Due to the position I thought it was either a fuse or a ferr... |
H: What if everyone uses voltage stabilizers?
A hypothetical question to improve my understanding of stabilizers and power supply.
Consider a rural village where frequent low voltage issue happens.
Now, if everyone there uses stabilizers to overcome the low voltage issue -
Does it give more load on the transformer wh... |
H: KiCad footprint or supplier footprint?
I download symbols and footprints from the component supplier into a project's library to go faster but I realized that many of the standard components footprints are slightly different in KiCad, like for example the SOT-23-6 so my question is: is it better to stick to KiCad f... |
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