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H: What's up with MOSFETs?
For the longest time, I've stayed away from FETs and MOSFETs (when it comes to using discrete transistors in my circuits, that is). I'm taking a current hobby project as an excuse to try and finally get comfortable with using them. However, I can't seem to make heads or tails from these bea... |
H: KiCAD Component Pad Clearances
I'm using KiCAD version 5, and I have an issue with it. Previously, I've been using OrCAD up until the point to where I needed multiple layers for my board. So, I redesigned my components, but I'm having an issue with my SOT-23 footprint.
Previously, in OrCAD, there were no problems.... |
H: Scaling up NTC measurement through Multi-Channel Ohm meter
For a test bed, we want to measure temperatures with NTC sensors (~10kOhm at RT) for the range 10°C to 70°C. Our test machine accepts auxiliary signal through CAN-bus, so we used a Raspberry with a "CAN-hat" to prototype the temperature measurement (three-p... |
H: Driving a difficult load with an Op-Amp: high capacitance, high current, high speed
I've been banging my head against this problem all day. I have a bizarre load that I need to drive over 88 feet of SMA that is a 68 ohm pullup to 15V. The cabling adds 2.64 nF of capacitance. I've sketched it below.
simulate this c... |
H: RS485 to RS232 conversion?
I need to connect a sensor that uses a RS485 transmission to RS232 or something I can read through the com ports on my data logger. I can't use usb ports or virtual com ports due to the program I am required to use not accepting data through usb in any form. Is there a way to convert the ... |
H: Can I use a capacitor which has 275v +-10% tolerance in a 9V circuit?
I am trying to get parts for a circuit i want to make and I'm very new at making circuits. As a result i'm unsure if i can use a 150nF capacitor with 275v+-10% tolerance in the following circuit or whether i need a different tolerance or anything... |
H: 10 Lamps setup 220v ac, would it be safe?
I am not an electrical engineering or anything, I am just a curious person trying things at my home for fun.
I want to setup a lamp system for my sister's mirror where I would need to use 10 lamps from just one socket.
I made a diagram of what I mean, all 10 lamps in parall... |
H: No output reading from Op Amp on Oscilloscope
So I have an inverting op amp (gain = -1) wired up, and it works with a DC signal. I checked the DC signal by measuring the input and output voltages with a multimeter which were 5V and -5V, respectively.
Now I hooked up a function generator to the input signal. The in... |
H: 480v motor, running like a bat out of hell.
I have a 480v motor that is connected to an auger.
When the auger fills up, the torque from the motor continues to drive it and then just snaps the shaft clean in half.
I am looking to build something that decreases power as the amp draw increases. Hopefully preventing th... |
H: Is it normal for the OC2 vacuum tubes to glow bright orange during operation & OA2 to flicker while running?
I just got this vintage Heathkit IO-10 oscilloscope from ebay. Just tried powering it up and it seems to be working fine. But I noticed that the OC2 tube seems to glow very bright orange and the OA2 glows pu... |
H: Heating a tube of aluminium electrically
I need to regulate the temperature of the surface of a tube of aluminium. The tube is used as a mandrel for composite molding/curing, so the target temperature is below 100C.
Currently, there is no type of heating element attached to the tube. I have done a little bit of res... |
H: How to test for USB dropouts on STM32F?
I've got a devices that is really strange, it drops USB periodically. By periodically I mean on a weekly (or biweekly) basis. By dropping out I mean windows loses the handle to the driver. Dropouts a not tolerated well by those using the devices. The weird thing is I use a si... |
H: Getting garbage output in serial monitor while communicating with OBD using CAN interface (MCP2515) and nodemcu
I am doing a project which involves getting vehicle speed from a car's OBD port and storing it in my database using nodemcu.
I am programming nodemcu using the Arduino IDE and using this library for worki... |
H: Average Current vs Arithmetic Average
I am just starting to learn the theory of electronics.
Coming from a probability and statistics background I have a very deeply ingrained idea of the term average.
The average to me is the Arithmetic Mean. In other words, if I was to take a sample from whatever data I calculate... |
H: Area under curve within a particular time window
I am trying to make an analog circuit which would measure the area under the curve of a periodic signal within a certain time window (say, t2 and t3 in the image). I expect different voltages(say 50-500 mV) within that particular time (say 100 us) and want to compar... |
H: Non-inverting op-amp configuration with capacitor
I don't really get what is the purpose of the capacitor C1 which is connected in parallel with the feedback resistor. After my knowledge, if we modify the input signal frequency the over all gain will modify accordingly because of the impedance of the capacitor whic... |
H: Mega2560 master on RS485 bus stops communicating with VFD when I add another RS485 module
I’m doing a project where I’m building a control panel for a VFD (inverter/variable frequency drive). I’m connecting the two over half duplex RS485 and use Modbus RTU. As a master I use a Arduino Mega 2560 with a TTL to RS485 ... |
H: What is the procedure for going from discovery board to a deployable solution?
Just to clarify with some context:
This voice based keyword detection requires an mbed discovery board; and I am sure some min flash size.
Even for a hobby project, i.e. personal home automation, putting several discovery boards in vario... |
H: Enhancing TVS diode circuit
I was reading into Electromagnetic Compatibility Engineering by Henry W. Ott about ESD protections and I was interested by the following part.
First, a series resistor (or ferrite) added in front of the
diodes to limit the magnitude of the ESD current, and second, additional bulk
ca... |
H: why do the electronic transformers that i remove from circuit boards keep exploding when connected to a 230v main
for the past 3 months I have removed several transformers from PCBs to try and use it for a different purpose ,but as I connect it to a 230v main supply they just keep exploding . I don't think my probl... |
H: Testing hot side of smps circuit with simple secondary loads
Goal: Testing hot side of SMPS independently of the cold /feedback circuit
I tested the Mosfet on the hot side of SMPS along with the rest of the circuit ( snubber circuit, bleeder, etc - not shown) by connecting to a resistive load in place of the puls... |
H: Loudspeaker / Amplifier "POPP" sound
I have different sound systems here. Some of them share the "problem" that they make a "popp" sound when I switch them on or off using the front-panel switch. If I accidentally switch off the socket they are plugged in, it's a very loud "popp" or more a "bang".
I know that some ... |
H: Identifying mystery dual channel opto detector?
How do I identify if a component is a photo diode or photo transistor? I have a three lead component removed from an old mouse where it was used to do quadrature encoding of the scroll wheel (a normal side facing IR LED was illuminating other side of the wheel) - pres... |
H: Understanding EOS SUBCKT behavior
I'm trying to modify an op amp to simulate its worst case behavior at end of life. In the common mode effect section of the LM124/NS I have the following
EOS 7 1 POLY(1) 16 49 1E-3 1
What is the function of EOS? I've been searching online for some information about what it does ... |
H: quartz tuning fork and its series and parallel resonances
Based on the explanation here, I understand that if you electrically drive a tuning fork, you would first see a peak (resonance) and dip (antiresonance).
I just tested the frequency response of a tuning fork, which was designed with 10pF load capacitance in... |
H: AREF Voltage same as VDD but through a reference IC
My project has 9V and 3.3V on the board. I would like to use a precision voltage reference IC for the analog reference on the MCU (MCU powered by 3.3V).
The precision of the voltage reference IC is 0.5%, which is more precise than the 3.3V regulated output voltage... |
H: How To Reassign The MISO Pin?
So I have a PCB with an LCD hooked up along with a 595 shift register. Unfortunately, when I designed the board I didn't realize that the LCD library used SPI, which on the Arduino Uno is pins 13-10. Therefore, the system overrides the pin 12 for the DHT and it returns nan.
The LCD lib... |
H: Essential Prime Implicant
While solving this question using Quine–McCluskey algorithm , I am getting total EPIs as 3 but by definition , it is giving 2 EPIs. I am attaching both solutions. Please correct me where I am wrong.
AI: A prime implicant is only essential if no other prime implicants can 'cover' its outpu... |
H: SWD AHB-AP access gives ACK_FAULT
When attempting to debug a STM32L471RGT6 chip over SWD, I encounter an ACK_FAULT whenever sending an AP request to halt the core.
I've implemented the following sequences which all work correctly, getting an ACK_OK for every relevant DP/AP request:
Select SW-DP on the SWJ-DP inter... |
H: Cole-cole plot curve collapses when trying to alter the valule of horisontal axis
I am a beginner and trying to simulate a cole-cole plot of a simple parallel circuit having two R, one coil and a capacitor. Image attaced, LTspice version is XVII, pc is windows7.
I've read this Q-A;[Bode plot graph: Frequency vs. An... |
H: Need help understanding an universal pin driver schematic
I was studying a schematic of an universal 48-pin device programmer, and while most of it seems pretty straightforward to me, I have trouble understanding the reasons behind some of the decisions made by the original author for the pin driver circuit. Below ... |
H: Wire to VDD or GND?
In the circuit below, there are four LTC485 ICs, one input (left), three for output (right). Pins 2, 3 and 8 are going to +5V, as well as GND. So where should I connect them to? Should I wire them all through the 100 nF capacitor?
What I see normally for a 100 nF capacitor, is that it is located... |
H: Series inductor to limit motor current?
Short question: Would it be possible to use a series inductor to limit the inrush current when switching on (or briefly loading) a DC motor?
Longer question: I have a battery-powered motorized toy which for convenience I'd like to run from a power socket instead (to avoid hav... |
H: How to find RS485 UART pins are inverted in the data sheet?
I want to know, how we identify the RS485 pins are inverted. I am using at91 microcontroller?
This sam9260 board has four rs485 in which two of them are inverted. How to know which ports are inverted, I didn't find such information in the datasheet also?
T... |
H: Can a MOSFET be used for dimming instead of switching a LED?
I have a simple circuit that uses a MOSFET to switch on and off a ~100W LED spotlight (30V, 3A). It works for this application.
I have been asked to modify the circuit so that the LED can be dimmed instead, but without using PWM (the reasons are beyond th... |
H: Negative Voltage Reference for Bipolar ADC
I am considering using ADS1258 - a bipolar ADC. It needs an external reference across REFP(+) and REFN(-). How do I generate precise -2.5V assuming I have +12V and -12V analog voltage rails? I can generate an approximate -2.5V using something like LM337 but I need somethin... |
H: LCD module with backlight
I am using COG-C144MVGI. I am trying to turn it on with my Raspberry Pi.
I am not sure if I am following the "power on sequence" correctly. Does this kind of LCD modules work without backlight? I am wondering if I am supposed to get some kind of reaction on the screen even without backligh... |
H: Understanding constant current LED drivers (ac to DC)
I am trying to understand the way constant current LED drivers work. Lets say I have a driver with these specs:
Description:
Power: 18W
Output Voltage: DC 36-63V
Output Current; 300mA
Input Voltage: AC 85 - 265V
I can attach one LED light (which accepts 300 mA c... |
H: Rule of thumb for surface tension when placing components on the secondary side of a board
I've been working on my first multi-layer PCB design, and have been placing a variety of components on the secondary side of the board (mostly decoupling capacitors and QFN ICs). However, some of these components are fairly l... |
H: LM317 Vout drops on load
I built a very basic circuit to get around 5.5V from a +15V source
I have a 220 Ohm between Adj and Vout and one 470 Ohm, one 220 Ohm and two 100 Ohm in parallel between Gnd and Adj summing up to about 740 Ohm
that should give me about 5.45V between Vout and Gnd.
With a 1.5k Ohm Load betwe... |
H: Nonzero current at voltage zero-crossing when consuming reactive power
In a circuit that consumes some reactive power, the current waveform indicates current flow even when the supply voltage is at the zero crossing. This seems paradoxical since there cannot be current flow at zero volts, barring some kind of super... |
H: I2C & SPI - share clock lines?
I know mixing SPI and I2C is a bad idea, but, when using a microcontroller short on pins, is it safe to share clocks between both buses, provided both are running at bus-tolerable frequencies?
In my application, I plan on using one bus at a time, but I suppose this question applies ev... |
H: Prime Implicant
In a K-map, I know block consists entirely of don't cares and is not part of a bigger block is considered as Prime implicant.
For ex-The one in red in the given figure-
But I am not able to figure out the reason behind it.
As that Prime implicant is of no use then why to consider it even as prime i... |
H: Control 24VAC solenoid with arduino using a octocopuler and a Triac
Following a previous question I implemented the following schematic on my PCB.
The schematic :
My PCB:
I have been unable to make it work, if I measure the voltage on j13 it's allways 25v, i know the controller is working because D2 Led is on ... |
H: Non-coaxial 50 ohm cable for LVDS
I'm looking to configure a Xilinx Zynq-7000 custom board with LVDS receivers according to the following diagram.
In my setup, the 'IOB' on the left represents an LVDS driver from a radar receiver and the IOB on the right represents the Zynq board that receives and processes the da... |
H: Visualizing Electrical Potential
After going through multiple youtube videos and some articles I'm still having trouble imagining voltage.
If we measure across a battery's terminals we will see electrical potential. This is caused by the collection of negative particles on the negative terminal and positive particl... |
H: Reducing noise on a voltage reference
I need a stable, low noise voltage reference that I can adjust between 1.4V and 1.8V. The output should source or sink up to 0.25mA @150Hz max. The output will provide a +1.65V bias for a bipolar signal driven by another op amp into the ADC on a microcontroller. (I need some ad... |
H: Why isn’t thermal noise work possible?
This must be an absolute naive question, but I’m going to ask it anyway. Aside from the obvious thermodynamic law violation, if I short cut a resistor’s terminals, why doesn’t thermal Nyquist noise in the resistor produce heat and raise its temperature until it burns up?
AI: B... |
H: 5V Tolerant Way To Generate Rising Edge Signal on USB Connection
I have a microcontroller device that can be awakened from deep sleep mode when it detects a rising edge signal on a wakeup pin. The wakeup pin is 5V tolerant and I'd like a connection to a USB port to generate the rising edge signal. Originally I was ... |
H: Gibbs phenonemon in real life
If I feed a square wave into a first order, passive, low-pass filter (resistor and capacitor), I get the following results on an oscilloscope (sorry, I don't know how to scale and rotate images):
Why does the overshoot only occur on half of the corners of the square wave? Based on Fo... |
H: Restrict making pcb library from board in altium
Hi can anyone let me know if there is any provision to make user not to extract the library from the given board file in altium designer as i would not want the user to extract the footprints from my board file
AI: No, there is no way (as far as I know) to lock out t... |
H: Schematic for input protection with NMOS? Does this really work?
I was reading an old schematic and found this and sketched it up;
(see box in image "Some kind of protection")
The closest thing to this schematic that I've been able to find, that could have briefly explained how it was works used a depletion mode N... |
H: IC that would pull output to the ground, perhaps NOT gate?
I have a board with four relays on it. It has a standard Vcc, Gnd, and In1-In4 pins. I want to control it with Arduino or in my case an ESP32. However, I noticed that when output pin on my controller is pulled HIGH nothing happens when it's pulled LOW the r... |
H: split LED current over 2 sinks
I have a display assembly with 8 WLEDs in 4s2p configuration for backlight. However, the split between 2 strings is made within the display assembly so I have only a single anode/cathode pair in the display connector. Each WLED has a Vf of 3.2V and If of 20mA, so I need to source 12.8... |
H: importance of voltage Gain of an audio Op amp
I have been looking into audio amplifiers theory.
So I understand that in the output you need a current gain in able to drive low impedance loads.
But I am having difficulty in understanding why it is important to have a high voltage gain at low frequency for the IPS(i... |
H: How to condition a NTC of very low resistance?
I want to use a temperature sensor which changes its resistance. For 0 degrees celsius its resistance is 0.5325 ohms and for 40 degrees celsius it is 3.264 ohms.
Obviously putting it in series with another resistance to produce a variable voltage is not logical since t... |
H: Converting boolean function (dnf) to only 2-input NANDs
I'm currently preparing for an exam and was doing some exercices regarding boolean logic.
Commonly asked question is to build a function from a truth table and simplify it with a karnaugh map.
After that we mostly have to convert the dnf to a circuit with NAN... |
H: Li-ion battery cell balancing statistically unnecessary when many cells are in parallel?
Lithium ion batteries packs need to be balanced because of a small random voltage difference for each section in series, that may cause the voltage levels in a pack to diverge over time, right? So if you had a large number of c... |
H: STM32 Virtual EEPROM Page Swap not working correctly
I try to save a look up table in the flash memory by using the virtual eeprom library from STM32. I chose a page size of 3kByte to save all the data and it works good until the page is full. Then, the routine EE_PageTransfer(VirtAddress, Data); is called nonstop ... |
H: DS1302 maximum current source/sink?
What is the recommended and maximum current sourcing and sinking capability on the DS1302?
Is this what's given by "Active Supply Current" in the spec?
AI: Current source and sink are given as IOL and IOH on the data sheet.
That is for signal pins. Not sure if that is what you ar... |
H: LDO ground with Diode for temperature Drfit compensation
I work the below circuit.
LDO is 3.2V fixed , Two diode is connected one at output and one at ground for compensate the temperature drift occur.
Op is connected to a micro controller VDD-BUS which takes generally 10mA current.
D1(SD103ATW-7-F) top diode wh... |
H: Question about using variable reluctance sensor
I am integrating a variable reluctance sensor into my project. These take the the signals produced by inductive pickups and convert them into nice square signals that a processor can use. Quite often, the voltages produced by inductive pick ups can be very large (> 10... |
H: Is there some way to measure mains voltage with the ACS712 sensor?
Last year I went to a maker event where some guys used an ACS712 sensor with an Arduino to monitor the mains voltage and current to monitor the energy cost in the house.
One thing I saw there is that they were measuring the mains voltage with the AC... |
H: Do voltage-limiting resistors exist?
I see sometimes that resistors are specified as current-limiting resistors, so I decided to see if voltage-limiting ones exist. When I do a search though, I don't see anything mentioning voltage-limiting resistors.
AI: A voltage source is theoretically capable of supplying an in... |
H: Uknown connector type
I'm looking for some information for the type of the connector this drone is using.
My nephew lost his charging cable for it and he can't reachage it anymore.
Can someone provide me with information if this connector has a specific name that I can look for or it's some proprietary connector th... |
H: Controlling an Array of Motors
I am trying to measure the state of a switch on a vending machine motor (model # BC-D27/28). It has a micro switch on it that has a lead going from COM1 to NC2 when engaged and COM1 to NO3 when disengaged.
There seems to be a 18 mV state when the switch is engaged that drops to zero... |
H: How can I signal a USB charger to provide power?
I want to use an 18650 battery pack to power a circuit with 5 volts at a low current. The 18650 battery pack has a USB output which provides 1 amp at 5 volts. I measure voltage drop across the left and right pins and it’s only .77 volts. When I plug in a device like ... |
H: Load causes voltage collapse. Why?
I have a circuit where a typical 3.7V LiPo battery supplies power through a bq24074 Charger IC, which should in theory short that voltage straight to the output of the charge-protect circuit, which then can be attached to a load. For a load, I'm having an electronic load drain con... |
H: How to amplify RF signal to high enough level for a CMOS downconverting mixer?
I've been reading original academic papers on mixers and now a RF textbook and I have been unable to understand a very basic thing, which is how do I get a RF signal, say -65 dBm, at a high enough voltage level for input into a CMOS-base... |
H: Resistor in the inverting terminal of the op-amp
I was studying the gain of an op-amp in both inverting and non-inverting configuration. In case of inverting configuration, the resistor is in series with the applied AC voltage. But in case of non-inverting configuration, the resistor is not in series with the appli... |
H: Altium 18 Place 3D bodyl dialog box missing
I'm trying to import a .step model into my footprint. I just upgraded to Altium 18 last night, and for some reason when I either click the icon to place 3D Body or go to the Place->3D Body menu, it doesn't open the dialog box. Instead, my crosshairs turn green and it want... |
H: USB type-B sockets vs USB Mini-B sockets
Most Programmers hardware equipped with USB type-B connectors for connecting to PC. USB Mini-B connectors are much less used in device programmers. Have the USB type-B connectors any advantages or benefits over USB Mini-B connectors when use in device programmers?
AI: Mini-B... |
H: Design for manufacturability
I am a current EEE student and was wondering how the process of design for manufacturability works?
What are the technical and safety issues that a manufacturer focuses on when designing a product to mass produce and sell? For example how do they determine that the circuits/product will... |
H: Tune the track length of a segment but not the entire net in Altium
I have a differential pair routed like this:
U1 ======> U2 ========> U3
I want to equal the length of the pair between U1 and U2, but Altium always try to equal the entire net length between U1 and U3.
Are there any method to achieve this?
AI: Mayb... |
H: Turns ratio of multi winding transformer
Hi can anyone let me know what is the overall turns ratio of the transformer shown in image below as i was confused
AI: You could describe the overall turns ratio as: 9.25:2(C.T.):1(C.T.), where the first number is 3-5, the second is 8-10 with centre tap 9 and the third is 1... |
H: How to show a long sentence on character LCD by using bascom?
I want to show a long message that going to differ every time and it's 3 lines or less. This message comes from Sim900. I cant show the whole sentence on my 4x20 lcd. how can I print it in several lines?
AI: See SPLIT.
You can use e.g. the SPLIT command ... |
H: Can R-783.3-0.5 DC-DC converter be used with 5V input?
I need to use a DC-DC converter to obtain 3.3V/100mA from a 5V supply. I have a R-783.3-0.5 available, but I am not sure if it can work with 5V input.
The datasheet says that the minimum input voltage is 4.75V, but note (5) says: "The R.783.3-0.5 requires Vin>5... |
H: Driving an Arduino with 12 V
I have an Arduino that I want to drive using a 12 V source. Of course, this can be achieved using a voltage regulator or similar solution. Notably, there is a loss in the conversion (at best, this is roughly 5 % with the best switching regulators), which is acceptable. That is all fine.... |
H: In an ideal transformer circuit, how is power transferred?
If I have a system of circuits like this:
where Circuit 2 is providing power the Circuit 1, where does the energy come from? Do the inductors store energy? If not, how is power transferred from the Circuit 2 to Circuit 1?
I initially thought that inductor... |
H: PWM, PAM, PCM sine generation and usage confusion
I am confused about something fundamental regarding PWM, PAM and PCM. I am going to be using a speaker's driver analogy to explain my point. As far as I know motors use PWM for power input, I don't know if my scenario with the speaker is any different but that's whe... |
H: Number of prime implicants
How many prime Implicants are there, 2 or 3?
F(w,x,y,z)=Σ(5,7,8,10)+d(9,11,13,15)
I am confused if red block will be counted as Prime Impicant or not?
AI: By the definition:
A prime implicant of a function is an implicant that cannot be covered
by a more general, (more reduced - mea... |
H: Kicad - Custom library folder
How do you create a folder to hold your custom components? The tutorials I've come across such as the official getting started guide show the creation of only one custom component. Using this approach you end up with several folders... For example in the image below, I have created two... |
H: Why are my relays dying?
I am using a SainSmart 5V 2-Channel Relay Module for Arduino to drive a hot plate (110V, 1000W).
I plugged my Arduino VCC and GND to the VCC and GND pins of the relay board and I drive both relays simultaneously through one of the digital output pin. The relays are controlling both the phas... |
H: How to flicker high-power LEDs with precise square or sine wave?
I need some advice regarding a setup with high-power LEDs I am currently working on.
My aim: I have a set of 6 high power LEDs (http://www.roithner-laser.com/datasheets/led_highsingle/apg2c3-530.pdf) that I need to flicker at different frequencies (be... |
H: MCP23017 connection to CD74HC4067 through Diode
I am connecting a digital output pin from an MCP23017 through a diode (1N4001, forward biased) to a CD74HC4067 input channel. VDD is 5V to all devices.
I am seeing 1.45V on the anode side of the zener and 0.7V on the cathode side. Since the CD74HC4067 is hooked up to ... |
H: Please help with resistor color code?
I have trouble with finding out resistance of a resistor. It has 5 bands but somehow I cant get the code right.
AI: Here's my best attempt: -
1st band is grey because the 2nd band can't be gold (see above) = 8
2nd band is red hence = 2
3rd band is green = 5
This makes the va... |
H: why do most sensors have an electrical output, regardless of the physical nature of the variable being measured
I have been trying to figure out a explanation to this question, can someone explain this ?
AI: Why do most sensors have an electrical output, regardless of the physical nature of the variable being measu... |
H: Unable to start calculating this voltage divider
I'm trying to solve all kinds of voltage dividers for an upcomming exam, but I'm stuck in this one. I've solved it in LTSpice, but I cannot solve it on paper.
LTSpice showed me, that the Ux=3V, but closest to that, I got to 3.333V (which I got from a voltage divider ... |
H: How to transfer energy generated from electromagnetic induction to a USB port?
For a school project, I'm creating a shake-powered phone power bank that will generate current similarly to a Faraday flashlight, which will in turn power a usb port. A simple enough concept.
Now to my (limited) knowledge of electronics... |
H: How does the power station compensates for the current that flows down to earth due to domestic body-current faults?
I know current flows in a loop and energy is used to move it in a loop. Now suppose we get a single phase AC (220/120V) electricity supply for our home and we have earth connection to prevent shocks ... |
H: How to determine data transmission rate from an eye diagram?
I would like to know how to determine the data transmission rate from an eye diagram such as the one given below:
Would it be the reciprocal of the length of time from the start of the diagram to the end? In this case 3 micro seconds?
AI: Observations:
... |
H: Difference between conventional Eye-diagram voltage plot and "Eye-density" plot in ADS Keysight Simulation
I know what is eye diagram. It is the sampled voltage plot at the clock frequency (Usually) of my circuit and superimposed. If the logic 0 corresponds 0V and logic 1 corresponds 1V then for the ideal case, the... |
H: Connector type suggestions required for 12V supply
I made a power supply enclosure with a mains switch and now I need external DC connectors to be mounted in the slot shown.
I want to mount two female connectors onto a 3D printed panel, that will sit where the slot is (see pictures below) and which will connect to ... |
H: Identify this rechargeable battery pack
I want to identify a rechargeable battery pack from inside an old portable hard-drive.
It is unlabelled. (I ripped open the blue covering - it isn't labelled on the internal metal cover either.)
Battery is ~55m x ~33m x ~5mm - so relatively flat. The plug is 3-4 mm wide.
Dev... |
H: Ambiguous symbol
Does anybody know what this symbol presents?
AI: Figure 1. Tri-state buffers with opposite control logic.
Image source.
It's a combination or overlay of the two symbols in Figure 1.
Rotate the symbol on the right by 180° and overlay on the symbol on the left.
Figure 2. Borrowing the symbol from K... |
H: Can I replace a battery with a source of the same voltage but different capacity (mAh)?
I have a device that has a bad battery and I am trying to find a suitable replacement. There are no replacement batteries for the device so I am trying to put something together myself. The original battery has written on it 3.7... |
H: Why doesn't my charge pump work with 1.5v supply?
I have been trying to get the following circuit to work with 1.5V AA battery but it does not work, even though it works fine with a 3.3v supply.
I built the multivibrator circuit by discrete components because I haven't been able to find a suitable op-amp or timer I... |
H: BJT: Equation of Vce for Saturation Region
In Sedra and Smith: Microelectronics Circuits (6E), it is mentioned, on page 185:
Recalling that the CBJ is much larger than the EBJ, the forward-voltage drop \$v_{BC}\$ will be smaller than \$v_{BE}\$ resulting in a collector-emitter voltage, \$v_{CE}\$, of 0.1 V to 0.3 ... |
H: Name of an enclosure in the shape of a DIP
Years ago, in a junk bin far away, I saw a device which was a small plastic box with protruding pins in the form of a 14-pin DIP — so that you could solder jumpers or small axial components to the inside end of the pins, close it up, and have a module of your own design th... |
H: Op. amp. with integrator - enough values to start?
All the red-circled values (Uref, C2, R31 and R36) are missing. I'm supposed to calculate them, but I think there's at least one value missing. Shouldn't Uref be known to calculate the rest of the values?
The waveform was given beforehand.
The power supply voltag... |
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