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H: Something is wrong with my understanding of this D-Flip flop design
I am a little rusty with flip-flops.
Consider this diagram:
This is a 4 channel stereo digital switcher. I am trying to understand the flip flop and the OR parts.
Because this is a 4 channel switcher, my feeling says that the flip-flops and the OR... |
H: Kirchhoff's Current & Voltage Laws
What are Kirchnoff's current and voltage laws? I've tried doing some research but most explanations are quite complex.
Also how can I solve the attached question using these laws??
AI: Hopefully this puts the two laws in somewhat simpler forms for you;
Kirchoff's Current Law state... |
H: What should the single-ended impedance be for LVDS?
For LVDS, it seems like the traces are usually specified as 100 ohm differential impedance. What should the single end impedance be from each trace to ground?
I'm looking at PCB impedance calculators, for example the nice list here: https://www.fedevel.com/welldo... |
H: (PSPICE) Memristor-Based IF Neuron Circuit: What is this NMOS?
This is a memristor-based IF neuron circuit.
My question is, i'm trying to simulate this circuit in PSPICE. However, I am unsure what the N-MOSFET characteristics (M1) are in the circuit diagram. I do not see any parameters in the paper. Do I just choos... |
H: The problem with "dirty" power supplies
I have a buck converter with an operating frequency of 180khz.
I want to power a microcontroller (raspberry pi) with it at 5v.
I understand the 180khz noise is not desirable for use with a microcontroller.
Would a capacitor across the output of the converter help remove th... |
H: What does it mean bipolar or unipolar junction in a transistor?
I can't find the definition of unipolar and bipolar junction in a transistor, for example BJTs has a bipolar junction and MOS-FET has a unipolar junction, what does it mean unipolar and bipolar junction?
AI: It doesn't have anything to do with the junc... |
H: Dependency of conductivity on temperature of extrinsic semiconductor
For an extrinsic semiconductor, how can we explain the following dependency of conductivity on temperature as shown here:
My thoughts:
At 0 K there is no energy available, hence no electrons can flow from the valence band to the conduction band, ... |
H: With a AC to DC converter can I put in DC to get AC?
With a old laptop power supply can I put in DC to get AC?
AI: No... it only works in the AC to DC direction. |
H: Smoothing capacitor burns out while I am trying full wave rectifier
I am new to Electronics. I am trying the Full wave rectifier.
I use a transformer and 4 1n5408 diodes (Vdrop is 1.2V) and try to get 24VDC output from 220VAC 50Hz. I measure the AC output (of the transformer) and it is 24VAC. I measure the output a... |
H: 16bit DAC with 24bit SPI?
My design requires a 16-bit DAC with 100kS/s plus and SPI communication.
Strangely to me, the cheapest 16-bit DACs that meet the requirement (parametric search) have a 24-bit SPI word, like the AD5662 (pdf) I'm trying to use. The least significant 16-bits are the output value to update and... |
H: One PSU powering one high power device & one low power device
If one was to power a (potentially) multi-amp device and an arduino with an external LM7812 12v voltage regulator to a 19v laptop charger (in parallel), would the arduino be safe when the multi-amp device started pulling lots of current?
AI: Your questio... |
H: Sony vaio keyboard dongle - Power issues connecting to another computer
I have stripped down a very early (2002) vaio all-in-one desktop which has a keyboard with a built in protective cover which I would really like to use on another computer. The dongle was placed under a cover on the outside of the casing and ha... |
H: Calculate inductance for 3-phase double ckt line
I have attached the problem with the solution given in my workbook. I attempted the problem and ended up getting a different answer.
Is my solution wrong ?
Please help me to understand the problem.
AI: It's mainly due to rounding errors in the written example. Fo... |
H: Electrical safety: Cracks on wiring
Today I installed a couple of light bulbs with my friend. The two wires coming from the ceiling we connected to the lamps using connection strips.
On close examination we noticed that one of the wires had a small crack in it - it was maybe one quarter or a third through the diame... |
H: What kind of capacitors are these small, cube-shaped surface-mount components?
Complete newbie question...
I'm troubleshooting a PCB that includes 4x very small cube-shaped components, labeled C2, C3, C5, and C6 so I presume they're capacitors. They're soldered in parallel and there's no visible markings on them, ... |
H: How to wire a high-current relay?
Background:
I am designing a small Arduino-driven circuit to control a ~3/4 hp AC hoist motor. The hoist motor includes a starter-capacitor. The Arduino drives a transistor which in turn drives a power relay that switches the motor on and off. I am not an electrical engineer, so I'... |
H: 5v clock feeding 3.3v microcontroller - resistor+zener acceptable?
So I've used a resistor and diode to level-shift from 5v to 3.3v, but that's been for general logic - the fastest thing I've done with that is 9600 bps serial.
I now have a need to feed a 3.3v powered microcontroller (an ATXMega32E5) from a 10 MHz c... |
H: 2 Center Tapped Transformers together
I bought 2 center tapped transformers because I need to make 30V 2A center tapped transformer equivalent and I couldn't find anything with a 120V input.
So I got a 18V 2A center tapped transformer and a 12V 2A center tapped transformer.
18V, 2A Center Tapped (9-0-9) Transfor... |
H: Converting ST link v2 to Jlink
Has anyone had any succes with converting a ST link v2 to a Jlink using the software that Segger provides? I have not had any success, even with using instructions they provided and was wondering if any one had any succuess/ guidance.
AI: The conversion tool you're referring to is onl... |
H: Deriving two independently stoppable clocks from one clock
I am trying to do some complex, pipelined computations in FPGA that involves storing partial results in block ram and retrieving them later. The problem is, the number of partial results that needs to be stored is very hard to reason about and depends heavi... |
H: SPI clock - slow frequency but fast rise time issue with waveforms
Background on the issue:
I currently have an SPI bus between an Atmel ATSAM3X8E and a Spansion FL164K flash memory chip.
SPI has always been super reliable for me in past projects, but this design is being very temperamental (the routing is far from... |
H: Is the formula for inductive reactance the same when considering rectified AC?
Is the formula X\$_L\$ = 2\$\pi\$fL still true for rectified (but unfiltered) AC (in which case the frequency f, and therefore the reactance, would be doubled in the case of full-wave rectification)?
I forgot to add a parasitic resist... |
H: AC analysis on transient model of Buck converter
I'm unable to understand why can't we run AC analysis on a transient model of Buck converter.
AI: AC analsyis (in the sense the term is used in SPICE) assumes all components in the circuit are linear.
A buck converter only works if some components (the switches) ope... |
H: Export pads as a pdf file in Altium
I'm not used to working on Altium Designer(17.1). I couldnt find how can I export only pad layouts to making a stencil schematic.
It is good to export as a pdf file if it possible.
AI: In a PcbDoc go to File -> Fabrication Outputs -> Final
There you get a print view of all layer... |
H: What is the difference between SOT 23 and SOT 23-3 package types?
I am faced with two types of packaging:
SOT 23
SOT 23-3
Is there some difference between them?
Based an article in Wikipedia it seems like there are no differences.
AI: In the beginning of the surface mount era was SOT 23, which had three pins. It... |
H: Stability of a BIBO transfer function
Why is this transfer function unstable? The poles are \$0\$ and \$-4\$, so they are in the negative half-plane, theoretically it was to be stable. Can anyone explain to me what makes it unstable?
$$G(s)=\frac{10}{s^2+4s}$$
AI: G(s) is equivalent to an integrator (\$\frac{1}{s}\... |
H: If I need to access memory cell by cell, should I shift or index?
I have a piece of memory which I need to access cell by cell:
parameter RAM_LENGTH = 1024;
reg [7:0] mem [RAM_LENGTH - 1:0];
I need to iterate cells sequentially. It looks like there are at least two ways to do this. The first approach is to index m... |
H: What is the equation for capacitance with aysmmetric plates?
The general equation for capacitance:
\$C = \frac{\varepsilon_0 \ * A }{d} \$
C capacitance
\$\varepsilon_0\$ permitivity of free space
A area of equally sized plates
d seperation distance between plates
I cant seem to find an equation whereby the eq... |
H: Is this interface just a low pass filter?
I found the following BNC input output box for two channels(left side inputs, right side outputs):
The grounds of the BNCs are connected via the metallic case. I checked this with multi-meter continuity test.
Then I read the cap and resistor values and drew and simulated ... |
H: Op amp voltage follower saturates (high-rail) at 0V
I have 3 op amps, and they perform in two different ways, but I am not sure why. I want to buy another op amp that behaves a specific way, but I'm not sure what spec causes it to behave like this.
Here are the 3 op amps I'm using. I will refer to them as A, B, a... |
H: Solving a parallel RL circuit for the r and l values
I've a parallel RL circuit:
simulate this circuit – Schematic created using CircuitLab
And I know that (the RMS input-current) \$\overline{\text{I}}_{\space\text{in}}=2\$ A, (the RMS input-voltage) \$\overline{\text{V}}_{\space\text{in}}=200\$ V, the input fre... |
H: Replicate PCB design on stripboard
I'm thinking about making a DIY project (this one).
I'm a complete n00b, I just have some theoretical knowledge about electronics from some university courses, and I'd like to learn some more. I was thinking about avoiding to buy the kit PCB (which is double sided) and, since I h... |
H: Required velocity of each wheel in 3-wheel omni bot
I'm using a 3-wheeled omni bot which can move in any horizontal direction (example: https://www.robotshop.com/en/3wd-48mm-omni-wheel-mobile-robot.html).
Given an object velocity (velocity at which the entire bot should move) and an angle it should move in (degrees... |
H: Induction motor - d-q model
I would like to simulate an induction motor in Matlab/Simulink using the d-q model.
I have found a paper that describes the whole procedure but I have this problem.
I am trying to create this block :
This block defines the following equation.
I can not figure out what the parameter *u ... |
H: Extending Output of a fixed Linear Voltage Regulator
I am working on extending output voltage of a fixed linear voltage regulator.Yes, I accept I could go for the variable voltage regulator.But I am in need to use a fixed voltage regulator.
My query is regarding the derivation of Output Voltage (V0) given in
Data... |
H: Unequal length Transmission line
I know that a transmission line is essentially two wires with some series resistance and inductance and some parallel capacitance - when there is a change in the voltage between them at a point the charge in the capacitance moves and thus a current is flowing in opposite directions ... |
H: How stable are temperature controlled crystal oscillators?
This question is not as obvious as it might seem. Consider this, concerning Rubidium clocks:
All commercial rubidium frequency standards operate by disciplining a
crystal oscillator to the rubidium hyperfine transition...
So at a fixed temperature, and ... |
H: Baker Clamp application for PNP Transistor
I have an issue related to Baker Clamp application for PNP Transistor. I know how to implement the Baker Clamp for NPN Transistor. However I do not know how to do it for PNP. So could anyone can suggest me a schematic?
Secondly, can the Baker Clamp reduce the turn-off time... |
H: Unrealistic ESR calculated from DF
I was calculating ESR for this ceramic capacitor, Samsung P/N CL21A226MQQNNWE.
Per the datasheet, DF is given as 0.1 max at 120 Hz.
Per formula, ESR = 0.1 / (2 * Pi * 120 * 22uF) = 6 Ohms.
What am I doing wrong, or is the ESR really 6 Ohms? That just seems way too high for a ceram... |
H: Calculate Inductance of a three phase transmission line
I was trying to solve the above problem. As I have done many similar problems, I attempted it in the following way
But I was shocked when I checked the solution given in my workbook.
Please help me to understand this problem.
AI: The coupling of other phas... |
H: Safely disconnecting an inductor
How is it possible to safely disconnect/turn off an inductor that has current through it without causing a huge backward voltage? Even dropping from a circuit with low current, it the current will still be going from finite to 0, in a very small space of time (how would you calculat... |
H: EMI determine farfield from nearfield probing
So I went to the chamber and failed at 900MHz. Then sniffing around with my E-field probe and my spectrum analyzer I found the source. Next I made some modifications that reduced what I saw with the probe by 3dB. My question is should I expect to see a 3dB reduction ... |
H: Input flexibility for powered vs. unpowered sensors
I would like to design a flexible input interface for my embedded device, which will see a mixture of sensors connected. The sensors themselves (e.g. thermistors) will be two-wire, with the data/signal wire being pulled up to 5V prior to interfacing with an ADC. T... |
H: Series RLC Circuit reduction possible?
This might be a dumb question, but with a circuit like this one:
Are we allowed to add the resistances and capacitance in series to get a single resistor, capacitor, and inductor? Can elements in series be reduced despite components in between them? If not, how else would we b... |
H: How to connect two (or more) BJTs (collector of Q1 to base of Q2 for instance) and still make their bias voltages independent?
The question is in the title. I'm learning about how to use BJTs and was wondering how I could connect them in blocks the way bias voltages (thus operation modes) are not being dependant.
T... |
H: What's wrong with my taillight verilog design?
I'm working on a T-bird car taillight design code, here is my design:
B means brake, all lights on at break,
when turn left lights on sequence: 000000 -> 001000 ->011000->111000
turn right lights on sequence: 000000 -> 000001 ->000011->000111
module taillight (... |
H: Shaded pole motor speed control
I've recently been given a 24W 230VAC 2 pole shaded pole motor(Mellor Electric AC1004) to make a fan out of. This fan needs to have a variable output speed depending on the temperature of the room. I am quite new to motors and was wondering how to make the motor speed variable. I hav... |
H: I want to find voltage across 5 ohm resistance by thevenins theorem
i want to know that wether my answer is right or wrong and if it is where?
AI: Looks correct. I didn't use thevinin's theorem, but I got the same answer as you by doing some algebra on the node voltages. I2, I1, etc below are the currents into nod... |
H: lm318n as noninverting amplifier
I am trying to amplify an audio signal generated by a hydrophone. I am trying to work from this (very general) circuit diagram I have found online and in an electronics textbook I own.
simulate this circuit – Schematic created using CircuitLab
However, I am confused about what inpu... |
H: ULN2803a relay connection
A motion sensor and a relay should be connected with an atmega328p. I soldered my circuit on a perfboard and have 5V power and ground rails on it.
Can I use the rail for the COM port of the ULN2803a or do I need to remove the VCC, jdVCC jumper on my relay and connect a separate power supp... |
H: How are load currents balanced in a distribution system?
Below I drew a simplistic view of a distribution transformer which supplies a particular public area for example some households and shops ect.:
Va, Vb and Vc are three phases(line voltages) of the transformer.
In my previous question I've asked about why ba... |
H: Mains power LED
I want to make a power LED in a small device I'm making, using 220V.
Are my conclusions correct?
simulate this circuit – Schematic created using CircuitLab
Assumptions
The forward voltage of D1 is negligible (due to 220V mains power)
Calculations
Amperage: V = I * R <=> I = V / R = 220 / 22000 =... |
H: Using low pass filter for a differential ended receiver system?
I want to use anti-aliasing filters in different scenarios. Below is the topology for how to use a passive LP filter in the case of a single ended transducer and single ended data acquisition:
How should the RC the connection be:
1-) If the source is ... |
H: How to efficient use Solar Panel to charge a 12V battery 10Ah?
I have tested my solar panel and i have these values :
Conneteced in series produces :
Around 136V and 16mA(closed circuit)
Connected in parallel produces : Arround 15V and 450mA(closed circuit)
I want from this panel to be able to charge a 12V batt... |
H: How did I break this optocoupler?
I'm trying to use an H11AA1 (datasheet) optocoupler to test when my doorbell is pressed (I'm in an apartment building):
simulate this circuit – Schematic created using CircuitLab
It worked when I first tested it, but then it stopped working less than a day later. I have a second o... |
H: What is the difference between modulating with cosine and exponential function?
Say I have an information signal x(t) with frequency f0 and I want to shift it on the spectrum to a much higher f1.
I would have 1) \$y(t)=x(t) \cos(\omega_1 t)\$ and by looking at the spectrum I'd see it's perfectly shifted.
I read you... |
H: NPN transistor controlling a PNP transistor
I can't understand why Multisim tells me that R2 and R1 will burn out after a while.
What are the correct resistor values that I should use. Or am I doing something wrong?
When a 3.3 V signal is received, the output of the PNP needs to be 24 V. Otherwise, it is to be 0 V.... |
H: Uncommon mosfet usage
Occasionally I am faced with a problem where I am faced with a device that needs two of it's inputs to be shorted together for something to activate (Think smoke machine or gate motor).
This is the circuit I have been using:
simulate this circuit – Schematic created using CircuitLab
The idea... |
H: Is it bad for an RF amplifier to leave it on with no input?
I work in a physics lab where we have some inaccessible experiments. One of them involves an RF power amplifier (a ZHL-32A+ from Minicircuits) driving a 50Ohm load that we can't access, but we can control its signal.
Sometime we have to leave this for long... |
H: Wien Bridge Oscillator
So I built the Wien bridge oscillator without automatic gain control and I am using a preset to tune the circuit instead.
My question is this, so when I reduce the gain of the op-amp to something smaller than 3, I can see the oscillations die out slowly on my oscilloscope. When I turn the pr... |
H: cross correlation reverse order
I have a quick question.
I was wondering about the order of cross correlation of two signals.
Suppose there are two correlated signals. \$y(t)\$ and \$e(t)\$.
Does the following expression hold?
\$R_{ye}(-1) = R_{ey}(1)\$
Which is equivalent to:
\$\bar{E}(y(t)e(t+1))=\bar{E}(e(t)y(t-... |
H: Protecting BJT base-emitter junction from breakdown voltage
I was playing with a BJT based circuit and I learned about the breakdown voltage of BE junction.
I came out with a solution of connecting a diode in series, with higher breakdown voltage. But I am not sure if connecting in the bottom and top are both same
... |
H: Techniques for building 'Bed of Nails' testing board
When testing a complete circuit board a 'Bed of Nails' can significantly reduce time and errors.
What are some techniques for making a DIY Bed of Nails?
Specifically, looking for what kinds of materials work best, how to trace the board properly to make the holes... |
H: How to make a PCB
I never made a PCB before, just breadboarding.
And now I have a very simple circuit, but I'm wondering what is the most practical way to convert it to a PCB.
Circuit:
simulate this circuit – Schematic created using CircuitLab
I want to use a small PCB board, 2x8cm like this:
I think the followin... |
H: What is a pin header with a wall on one side called?
What do we call a Pin header that has wall of one side to ensure you don't connect it wrong(Male side) and on female side there is a slot opening for the wall so it sits and fits perfectly?
Sorry I don't have a picture, I have just seen it but don't know what the... |
H: Transimpedence amplifier output from 0 to 3V
I have this circuit configuration using the Lm324an op amp with a 5V rail (needs to be 5V) an infrared led and a photodiode. At the minute using a using a 1M resistor the output swings to rails when I place the light source closer to the photodiode however I would like t... |
H: What could have gone wrong with my TLP222A?
I'm using a TLP222A to switch a 24V load that never pulls more than about 200mA. My circuit looks like this, ignore that the chip name is wrong.
I have 4 of these connected to 4 GPIO pins. 2 of them have, for no reason I can discern, stopped working. They show 1.15V at ... |
H: 2D DIY capacitive panel
I'm planning on replacing lights with smart bulbs (e.g. Yeelight RGBW) and replacing light switches with capacitive panels connected to Arduinos which will send data to RPi, which will then control the lights.
I want to make the panels by myself, like here. They will contain some round sli... |
H: What does Pin type I mean on the ESP32 datasheet
On page 3 of the esp32-wroom datasheet (PDF) it shows a series of pins with type "I".
What does pin type I mean? Are these different to the pin type I/O pins? If so, how?
AI: Some pins can be input and output: I/O (or sometimes General Purpose I/O: GPIO).
Some pins c... |
H: Are these two transformers the same?
I am wondering if I can use two normal transformers to form a center-tap transformer..
Here's what it looks like:
If I use the right number of turns, would the transformer on the left same as the center-tap transformer on the right? Or how could I make them equivalent?
I am try... |
H: How to identify temp setting on a CH-152-35 thermostat
Pictured is a CH-152-35 thermostat. It is similar but not identical to the one described at http://www.wako-clinac.co.jp/product_en/ch-152-35_en/index.html
I don't have a way to heat this thermostat in a controlled fashion until the switch opens- So I cannot de... |
H: Figuring out wattage
I know I can take volts * amps to figure out watts, but what if the device accepts a range of volts? So if I have a device that takes 100-240 volts, and is 2 amps, what is the wattage being used? Does it change as different volts are use?
AI: If the device includes a switch-mode power supply, t... |
H: Attiny4 - Possible Errata Found With PWM
I have searched the AtTiny data sheet and not found anything about this. I'm experiencing a weird PWM bug. When I expect 100% on I'm getting less. I'm using an inverted PWM scheme, so setting it equal to 0 should be full on, but my scope shows a ~95% on duty pulse.
Below I p... |
H: RC Op-Amp Circuit Analysis
I am trying to calculate the gain Vout/Vin of the circuit below. I'm not really sure where to start, can anybody help?
AI: Assume that:
no current flows into the input of the opamp
the input voltages of the opamp are the same
Then write down and solve the Kirchoff equations. |
H: How much electricity does a 1 GW plant actually produce if the plant's efficiency is 20%?
I'm trying to see what percentage of total electricity demand will be met by solar power in some year x. Let's say I have data saying that the total electricity demand in country A is 1000 billion units (BU) in 2025. Let's als... |
H: 2 pole RC instead of LC filter in Buck
What if I use second order RC filter instead of LC filter in Buck, even it gives roll-off of 40db/decade.
Why is LC preferred?
AI: Inductors and capacitors give and take reactive power. This means that they charge and discharge power.
Resistors consume real power, the only way... |
H: What does "LB" out mean in a DC-DC buck converter?
Teacher gave me a schematic,and it includes a DC/DC buck converter with "LB" input and output,but i have no idea what the "LB" is,so i want to ask that does someone know what may the "LB" be?
AI: "LB" stands for "low battery".
They are the input and output pins fo... |
H: Single board computer (SBC) with industrial grade
I was using single board computer (Raspberry Pi, Beaglebone) to develop prototypes. A new requirement is that the prototype should satisfy "industrial grade" with regarding to (for example):
Temperature (e.g. -40 to 85 degree)
humidity
life cycle (e.g. 10 years)
mea... |
H: Relay with notifications circuit
(see update at the end)
This is a continuation of my previous question about a relay: Question
What I want is a notification LED for both power and if a switch is on, which controls the relay.
Below is the circuit I have in mind:
simulate this circuit – Schematic created using Circ... |
H: Using an NPN tranistor as a switch for two bipolar stepper motors
this is my first electronics project which requires controlling 2 different stepper motors with two motor drivers (L293D). I have found that the number of GPIO pins on my microcontroller (ESP8266) is 9. However, i require 10. I have found on the ardu... |
H: How do manufacturers limit bandwidth in oscilloscopes?
I would like to know how do manufacturers limit the bandwidth through software options in oscilloscopes? If i have a MSO with 1GS/s, but e.g. just have 70Mhz out of possible 200Mhz (via software option), do the digital channels sample at 1GS/s or are they as we... |
H: TP4056 Lithium Charger cut off voltage
This module that I got from ebay
has a cut-off voltage of 2.5V which is way too low. At that point your Lipo is probably dead. Anyone succeeded in increasing this to higher voltage? I would like to have it at 3.3V .
AI: On many of these typical lipo chargers the small 6 pin ... |
H: Capacitor charging not working according to t = rc
I have researched about capacitor charging time, with its charge being at 63% after 1 time constant, being t = RC. I am trying to repeat this by myself, using a 16V 1000µF capacitor, a 1KΩ resistor, and a constant power supply (~7.3 volts, ~1.9 milliamps) from a so... |
H: LVDS signal to FPGA
I need to receive 42 pairs of LVDS signals to a FPGA.
All i want is that the FPGA converts the differential pairs in normal std_logic signals.
And i need to choose a xilinx FPGA with enough pins that support LVDS signaling.
I'm a bit confused and don't know which kind of FPGA to choose depending... |
H: What is the recommended fully-charged voltage for NiMH AA batteries?
I have done research on different batteries and cannot find a maximum OR minimum voltage to keep NiMH AA batteries within. It seems that typically battery chargers will measure the negative voltage CHANGE or the temperature, but are not designed ... |
H: LED light intensity drop using 200k range resistors.
I recently had an experiment in school where I used resistors that were 130k, 140k, 150k, 160k and 170k ohm to dim a red LED. The light intensity was then measured with a Pasco light sensor. The circuit was powered by a 9v battery.
I was wondering, how could I p... |
H: Putting two sallen key filters in series
Can I put two sallen key filters in series without putting a buffer in between them (in order to analyse it mathematically correct)?
I know that when the output impedance of the first sallen key filter is much lower than the input impedance of the first sallen key filter.
AI... |
H: Oscilloscope displays the derivative of the signal instead of the actual signal
I have a Tektronix TDS 2024B Oscilloscope. For some reason it displays the derivative of the signal. It cannot be the "Math" feature as it only computes addition or subtraction of 2 signals supplied through CH1 and CH2. I even tried to ... |
H: Linear and non-linear attenuator
[edit 3/2/18] There are problems with the title and wording of this question. I would edit, but to do so would alter the relationship between the question and the answer that I accepted. So, I have re-asked the question in a way that better describes what I was trying to learn. You ... |
H: LC-Filter for DPS5005 power supply
I bought a DPS5005 unit in order to setup a cheap power supply. The module seems to be quite popular and has often been described as remarkably good for its low price of about 35 $. However, even under load (2 A flowing through a 0.1 Ohm resistor) I get short 450 mV peaks at a fre... |
H: VFD? to power aircraft non-motor/inductive load OR power conversion
QUESTION: Is it plausible to test power, out of aircraft, a mostly solid state device ie Microwave Oven? Can a VFD be programmed to run with inverter circuits. If so, 3 phase + ground output of VFD is 4 wire load compatable? PHOT0 1 vfd
POWER SOUR... |
H: Parallel a diode to solid state relay load is a short circuit?
I'm trying to use a solid state relay control a 12v dc air pump, so I was reading the "Solid State Relays Common Precautions"(like below).
http://omronfs.omron.com/en_US/ecb/products/pdf/precautions_ssr.pdf
When I read the paragraph shown in the screen,... |
H: Using Extra-Wide Traces
I am currently laying out the board for an audio amplifier I am working on. The power requirements aren't very high - there won't be much more than 500mA flowing through any given trace. However, I have ample space on my board, so I was thinking about using wide rectangular fills (40-50mil w... |
H: Confusion about a step down transformer use
This might sound a dumb question but I couldn't find an answer myself. I have come across this transformer. It has selectable I guess primary 215V to 400V, and a fixed secondary 115V. I know that nominal mains is around 115V in the US.
I first thought It is to step down l... |
H: Read and write simultaneously from different indices of an associative array in system verilog
Is it possible to read and write simultaneously (In parallel) from different indices of an associative array in System Verilog ?
AI: There's nothing to stop you from doing that. But like any variable you read and write fr... |
H: Questions About Charging Lithum Ion Batteries
I have a few questions about charging Lithium Ion Batteries aka a collection of cells...im learnin...lol
1) I am looking to setup 14x18650 cells to make a 51.8v module in series. I know I need its best to use a BMS (purchased). I also got a smart charger that is designe... |
H: Triangular Symbol in a A circuit
What is the meaning of the triangle above with "5v" written next to it? is that a ground symbol or an input voltage symbol?
AI: Here's some hints to what it may be
It says 5 V, it does not say \$V_{in}\$
it is a constant 5 V |
H: I have a heater in a 3 phase (415V AC, 230V per phase) timber kiln drawing 43A per phase. How many kW is this?
I'm new to this subject, but I want to learn. I have an electric heated timber kiln and I want to replace the electric heater with an equivalent rated oil burner, therefore I need to calculate the output p... |
H: How to redesign the circuit such that the switching threshold is VDD/2.
he switching threshold is the input voltage where the output crosses VDD/2. I want to redesign the circuit such that the witching threshold is VDD/2.
AI: Design each to have the same Vgs(th) at 1.5V and similar RdsOn (although Nch tends to be ... |
H: Circuit with Zener-Diode not working (simulation do)
Hello,
I have the circuit shown above. Its made to measure analogue voltages up to 10V and converting currents up to 20mA to a voltage output.
10V or 20mA = ~3.3V output
Now I want to test the voltage measurement functionality:
Vgate = 0V
V_I_IN = 0V to 10V
Th... |
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