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H: What does an "E" mean in a resistor value? (ie 150E)
I'm trying to build a dc motor controller circuit as described here.
But it requires 2 "150E" resistors
From looking online I believe this means 15 ohms but I'm curious as to why, and why I couldn't find anywhere explaining such.
AI: E means ohms. 150E is 150 ohm... |
H: Can you help me identify a flaw in my DC motor brake design
Can you please look at the schematic below and tell me what I am doing wrong.
The p-channel MOSFET always shorting no matter what I do also checked with different components and got the same result.
Thanks,
AI: Can you please look at the schematic below ... |
H: How does an MCU pin detect a voltage?
If I have an MCU pin connected in between 2 resistors (a voltage divider) how does the MCU pin actually detect the voltage? I am using an ATMega328 and reading the voltage from the divider by an ADC enabled pin.
I believe my understanding is broken but here is what I'm thinking... |
H: Amplify sinewave to 6A
I am trying to create a 6A, 60Hz sinewave. A 50W audio amplifier with the standard 4Ω minimum output resistance is available, but I deduce it is only able to supply an absolute maximum of 3.5A. My idea was to use a transformer on that output and increase current that way. The signal will be a... |
H: Decoupling capacitors values in mixed-signal circuit
I know theory about decoupling capacitors (ESR, ESl, parallel capcitors etc.)
I have read Electromagnetic Compatibility Engineering, H.W. Ott.
My question is about practical design. How shall i choose appropriate capacitors to achieve the best results ?
I have ... |
H: Unknown connection to digital counter 4060
Hey friends! I'm supposed to build this circuit but I'm not really sure what should I do about the thing that is inside the red circle I marked.
Original site is here:
http://www.eeweb.com/blog/extreme_circuits/dicing-with-leds
I have no idea what that triangle means and ... |
H: Slow rise time on MOSFET
I'm doing this project, where i control the speed of a motor with a 0-3.3 V PWM signal from a microcontroller. In the test setup i use a function generator (Digilent Analog Discovery). I would like the PWM to run at 50 kHz, but for better measurements, I have lowered the frequency to 15 kHz... |
H: K2961 Mosfet Equivalent
I've been searching for a replacement for a Toshiba K2961 MOSFET for a few days, but I can't seem to find any.
The datasheet for it is available here:
http://pdf1.alldatasheet.com/datasheet-pdf/view/213272/TOSHIBA/2SK2961_06.html
Perhaps someone can help me find an equivalent model of MOSFET... |
H: Where to put the Flyback Diode in a Relay Module?
I'm working with a relay module to switch a solenoid with an Arduino, Im having problems because the arduino get some noise in an LCD but I'm not sure where to put the diode, there is 3 pins, In, Vcc and GND. I think there should be a diode between In and VCC/GND bu... |
H: Multi-cell li-ion charger
I have a problem with LI-ION technology.
I'm planning to use four 18650 cells in series, and I want to build a circuit for charging them. The final application is a sort of small UPS; I should keep the 18650 batteries charged and, when the main power goes off, switch to the 18650 batteries... |
H: Is the Nyquist plot a plot of Re(G(s)) v.s. Im(G(s) or Re(G(jω)) v.s. Im(G(jω))
It seems that people in control theory are divided over whether the Nyquist Plot/Diagram (that is the plot, not the contour!) is a plot of $$\text{Re}(G(s)) \text { v.s. } \text{Im}(G(s))$$ or $$\text{Re}(G(j\omega)) \text{ v.s. } \text... |
H: Measurement with oscilloscope best practices
I own a DS1102E oscilloscope with 1x/10x switch on the probe, and I need to measure voltage output from the MEMEs driver similar to MAX14515 (I can not find the exact datasheet for MAX14574). The driver provides 0-140V biased at 70V at 5kHz wave.
Is it safe (for the chi... |
H: What is the UART TX interrupt for?
I know that the RX interrupt is obviously used to save polling, but why the TX one too?
AI: The main goal of the TX interrupt (really an END OF TX) is to send the content of a buffer (multiple bytes) automatically. When implemented in a proper way:
Enable the TX interrupt.
The us... |
H: How to power a DC brushless motor without a speed controller
I have a brushless motor but It doesn't power directly with a 9 volt battery, but I don't have a speed controller what else can I use to power it.
AI: Brushless motors do not have commutators so they cannot be powered directly from DC sources such as batt... |
H: simple synchronous single winding motor
I am baffled how this motor works...It has a single axial winding that turns
a disk. The disk is not a strong magnet but somehow this motor has torque
enough to swing a floor fan. I see on the internet that this type of motor is also
used for microwave ovens to turn the tray.... |
H: VHDL case with different outputs
Is it a valid and synthesizeable VHDL code?
case IR(10 downto 7) is -- RD
when "0000" => R0 <= RTA;
when "0001" => R1 <= RTA;
when "0010" => R2 <= RTA;
when "0011" => R3 <= RTA;
when "0100" => R4 <= RTA;
when "0101" => R5 <= RTA;
when "0110" => R6 <= RTA... |
H: VHDL: Using type on ports
Is it poosible to use user-defined typed in input/output of VHDL enitities?
ENTITY test IS
PORT(
input : IN std_logic_vector (0 TO 63);
test_input: out MY_TYPE;
);
END test ;
AI: Yes, declare the type in a package, and use the package before the entity, a... |
H: Considerations when using internal pull-up/down resistors
I am working with STM32 micro-controllers. These micro-controllers have the option to set the input pin as pull up or pull down:
Earlier I used to give external pull up or pull down resistor wherever required but now I am wondering whether I can do away wit... |
H: Pull up resistors on UART
I was going through an app-note AN2606 where I came across this connection diagram:
As per my knowledge, UART is push-pull type and Tx provides the pull-up required and hence we don't need to use any external pull ups. Am I missing something here?
AI: While the microcontroller is in reset... |
H: How to multiply fixed point numbers of different format
Assume I have two 16 bit fixed point numbers in following format being multiplied.
Q3.13 * Q10.6
What is the correct way to multiply them, i.e do I right shift the first number to align it as Q10.6 or left shift the second number to align it as Q3.13? In both ... |
H: Understand H-Bridge
I am trying to understand the H-bridge, I have edited the circuit and followed the advice in this thread. Is this a good H-bridge design?
simulate this circuit – Schematic created using CircuitLab
I have also added a digital short-circuit protection. How can this circuit be improved?
AI: The H ... |
H: UART signals connected to RJ45 connector?
I'm looking at a schematics and found something strange to me.
The schematics connects UART TX/RX signals to a RJ45 connector (leave other unused pins unconnected).
Does anyone know such application?
What's the purpose of such design?
Thanks.
David
I can't get the exactly s... |
H: Read (High/Low) Arduino Output with an Raspberry GPIO Input Port
I want to trigger events on the raspberry (3) with an Arduino. Because of very contrary statements to this, i am kinda Lost. Arduino outputs 5V, that should be read by an Input of the Raspberry. Just slow Low/High Values, kinda like Buttons presses.
D... |
H: How does one arrive at the following transfer function for a certain circuit?
I'm trying to understand the derivation of the transfer function for the following electrical system:
Where \$k\$ is some forward gain element and \$G_{s}\$ is the transfer function of some plant. According to an instruction video, the ... |
H: What is the function of this cable surrounding the CRT of old televisions
I have opened old televisions, and each time, I'm wondering what is the function of this cable, roughly insulated with some tape.
Note: I know what are the risks of opening televisions.
AI: It's part of the degaussing system. "Degaussing" re... |
H: Question on battery basics (I'm confused and not sure how to state my question)
I'm new to the mathematics behind the electrical engineering and quite confused. I have done some searching around and haven't found anything, probably because I'm asking the wrong question.
On a 9V battery, it says '9V'. What does that... |
H: Avalanche ruggedness
How is a high avalanche ruggedness physically achieved for a MOSFET and what are the trade-offs in other parameters to get a high avalanche rating. Also, how should one interpret the avalanche energy listed in the datasheet? Another way to state this may be, for a given design, how do you kno... |
H: Opto coupler keeps on breaking
Good day,
I am building an H-bridge (picture below). My opto couplers were ILQ74. I am using 560 ohm current limiting resitors for the opto coupler diodes, with an input voltage of 3.3V (from MCU). My calculations proved that even 100 ohm would be enough. However, it already happened ... |
H: What does the recommended values on a motor mean?
If a motor has a voltage and amperage on it, what do those values mean? (Is voltage how much voltage the battery must be rated? Is amperage how much amperage the motor will use ['pull' from the battery], or how much the battery must produce?)
Does voltage correlate ... |
H: Arduino power and networking over cat6
I plan to run about 4-5 arduino pro micro in my backyard to handle controlling of solenoid valves for garden watering based on measurements of soil (so we keep it well watered).
My question regards the supply voltage, I wish to use cat 6 over maybe a 20m run in total to supply... |
H: PWM controlled Input Voltage/Current regulated Converter (for solar panel)
(newbie question)
Briefly: In a converter (let's say DC-DC), I want to dictate a voltage to the output of solar panel, on the fly.
As I look around online, for example in some IEEE papers, Buck or Boost converters are used to regulate the s... |
H: What is this trapezoidal logic gate?
What is this thing called? how does it work?
I've tried googling so much, even pasted the image in the google search box haha
Its used here on the MSP430:
AI: It's a multiplexer. When the input on the side has a specific value, the input corresponding to that value is propagate... |
H: Is 2's complement the only way that singed binary numbers are represented?
I have only seen mention 2's complement practically everytime signed number representation is mentioned. However, I have found that there are other ways to represent signed numbers also, these are 1's complement, excess-k and base -2.
Except... |
H: Is there a way to use constructive interference to create a specific sound in a specific location?
With 8 speakers, one in each corner, can a combination of waves be emitted that are silent from the sources but form a coherent emission somewhere between?
I mean that even if you walked around the room the sound of s... |
H: What is the origin of the capacitance formula?
Everyone knows capacitance is defined as C = Q/V, but why? Sure I understand the utility of it and its use, but can someone provide a motivation or historical context for this definition? I'm unable to find one on the internet. What I am is asking is if someone can tel... |
H: What determines how much power the motor 'draws'?
I'm new to electrical engineering, and probably asking the wrong question. Not sure how else to phrase it.
For the question, I'm going to use an example layout of simply a 9v battery attached to a toy DC motor.
From my understanding of my previous question, the volt... |
H: Designing a dental furnace control board
I have a few question about designing a heater control board . Firstly I took a power electronics lecture in the university eon ago but now I try to remember it anew. :)) Regarding my subject, I have an old dental furnace (ivoclar p80) which runs AC 230V and makes heat up to... |
H: What is leakage current in an LED?
Is 'carrier leakage from the active region' of an LED the same as 'reverse leakage current'? If they're different what are their respective physical origins?
AI: The term leakage is applied to reverse biased diodes because ideally the current would be zero. Saturation means more ... |
H: What is the standard way to represent fixed point numbers in VHDL?
Is there a native type in VHDL language similar to std_logic_vector that allows one to create a signed or unsigned fixed point number for given length of fractional and whole parts? If so, can it be synthesized?
How does one see fixed point quantiti... |
H: Configuration of AC Voltage Source for Sawtooth Wave
I have a little problem with circuit configuration as you can see below.
Every Voltage Source has configuration - 120V/10 kHz
And 1,3,5,7,9 - 0 Deg, 2,4,6,8,10 - 180 Deg
I need to change voltage on every source in such way that I will see Sawtooth Wave.
I tried ... |
H: I need help with designing my first PCB on Proteus?
I've placed the component of a simple power supply circuit on PCB layout screen using auto-placer and auto-router. I would like to know many things about dimensions:
Is there a standard space between each couple of components?
If No, What should be the space b... |
H: Connect low-RPM motor to computer PSU
My ongoing (beginner) case-modding efforts have led me to desiring a spinning globe within my computer case. I would like to use a low-RPM motor (something between 4 and 20 rpm) for that and connect it to the PSU to power it.
I have an IT background, but absolutely no clue abou... |
H: strange results from transmitter radiation calculation
This table was taken from:http://www.emfwise.com/distance.php
At that site a formula:
Power Density = P/4Πr2
was used in order to calculate the power density(mW/m2)
according to the distance from the transmitter.
On that table the transmit power of the transm... |
H: What wavelength will achieve higher speed in optical fiber?
I've got quite easy question (and my attempt to solve it). So there is an optical fiber with Dispersion index: D = -100ps/nm•km, length: L = 10km. The question is: which wavelength will achieve faster speed and the end of the optical fibre: λ_1 = 1000nm or... |
H: What makes PC SDRAM so much more expensive than the same capacity in a chip?
I'm picking a SDRAM IC for a custom embedded board and was surprised by the low prices. Was expecting orders of magnitude similar to PC ram of the same capacity.
For example H5TC8G63AMR-PBA chip costs almost 4 times less than this Corsair ... |
H: How did I survive this shock?
When I was about 10 years old playing with lamps, I accidentally picked up a wire completing a circuit for a lamp plugged into the wall (120 V AC U.S. standard). I'm not sure if it was the hot or neutral wire, but I had completed the wire from hand to hand. I had a shock and dropped th... |
H: Can I use a multimeter to measure voltage even if amps of circuit is too high
I need to measure circuits which I expect to be 12V 19A and 5V 44A
I've got a basic multi-meter which can handle 10A/ 240V
Can I use this multi-meter to measure only the voltage on the circuits? As the amps are too high; if I try to measu... |
H: Can you short two output pins of a decoder (74LS154N)
Let's say for two inputs, the output values will be the same. So instead of using an AND gate, I was wondering if i can just short them. Please check the attached logisim screenshot to get a better idea of what I'm trying to do.
The 7-seg display will show "1" w... |
H: Noise in op amp design or EMI?
Sorry for the long post, but I've been trying to work this out in my head.
The circuit I’m working on is based on EEVBlog's dummy load. The circuit works by using an op amp to set the voltage at a current shunt resistor and burning rest of the voltage across a mosfet.
The voltage is... |
H: How does a capacitor reduce voltage drop in a DC motor start?
I know that a capacitor stores charge:
C=Q/V
but what i don't understand is how this would reduce the voltage drop caused by high current draw.
My theory is that the capacitor would need to be in parallel with a conductor (minimal resistance) and then c... |
H: Intel 8052 (and friends) minimum set up
I recently got a batch of old microcontrollers (8052 and Z8671) and I just want to get a minimum working set up for them.
Since these microcontrollers already have most everything baked into them (BASIC, RAM, ROM, Serial Ports), it seems like it'd be a simple matter of pluggi... |
H: Is 55ns SRAM fast enough to drive low resolution VGA?
I can't seem to wrap my head around the math.
Assuming I want a 640x480x256 VGA signal, and I had an FPGA or fast micro-controller to drive it, would 55ns be able to handle it?
Meaning each byte of the 8-bit memory would translate to one pixel. Also assuming ... |
H: Explanation of Conditions of Equivalent Electric Circuits
Two electric linear circuits are equivalent when they have the same voltage-current relation at the terminals of interest under all circumstances.
In order to check if two circuits are equivalent across two terminals you have to
Turn off the current source... |
H: Question about how data sent from the tmp102 is processed
I wired up a TMP102 sensor(on a breakout board) from sparkfun. The wiring made sense, standard i2c wiring. Here is the TMP102's datasheet. I used this guide as a guide for the program that I wrote. The program that is running on the particle photon(the micro... |
H: Switching between +9V and -9V (using 5V logic)
I got some linear actuators today and found out that when I give them +9V they extend and -9V makes them contract. This is easy enough to test by hand, simply by wiring the actuator up to the battery backwards for the negative voltage, but when I hook it all up I'm goi... |
H: Multiple power supplies, why link negative
I'm new to electrical engineering, and I still have many stupid questions. Here's one of them.
This is what I'm reading. https://itp.nyu.edu/physcomp/labs/motors-and-transistors/using-a-transistor-to-control-high-current-loads-with-an-arduino
In it, it says to link the e... |
H: What is the purpose of a flyback diode?
I'm new to electrical engineering, and I still have many stupid questions. Here's one of them.
This is what I'm reading. https://itp.nyu.edu/physcomp/labs/motors-and-transistors/using-a-transistor-to-control-high-current-loads-with-an-arduino
Next, add a diode in parallel ... |
H: Precise line regulation using linear voltage regulators
I am trying to build a linear 24/12V power supply. One of the requirement for it is for the line regulation to be very precise (an error of 0.0005 V is considered acceptable). I wanted to use a linear regulator Ic, but I haven't found any that fit my needs.
W... |
H: RC anti-aliasing filter for a pulse train
Many data-acquisiton boards are recommended to use anti-aliasing filters between the analog inputs and the ADC.
Here what I understand from anti-aliasing:
If one has a DC like signal and the freq. of interests of the signal is not more than 10Hz one can use an RC low pass ... |
H: Intuitively, why does gain margin and phase margin infer instability in feedback system?
On MATLAB https://www.mathworks.com/help/control/ref/margin.html, gain margin and phase margin are additional gain in the system and additional delay in the phase of the system such that the system will be unstable.
Can someone... |
H: Questions on acquiring signals in Peak Detect mode in an oscilloscope
I just learned that one must set the Acquire feature of a scope to "Peak Detect" to see the possible glitches of pulses.
But in the following document it also mentions that:
"This mode is effective when at the horizontal scale setting of 5 ms/div... |
H: Powering a MCU from a battery without a regulator
I have seen some development boards (for example. BL652 dev kit) for low power chips have battery power connected directly to the MCU without a regulator.
For the example case, the battery used is a 3V CR2032. The datasheet for the MCU defines the following paramete... |
H: Monostable out of NAND gates
For the diagram below, I can see that it functions as a monostable (I have built and tested it), but I can't really see why it works, I mean, I can see that there is an RC network, which a monostable has, but I don't see how it links up with the logic to make a monostable.
Any help woul... |
H: How to calculate current consumption of this sensor?
I am calculating the current consumption of an IR ranging detection sensor. Below is the related part I captured from the sensor's specification. The working mechanism of the sensor is that it will send out an IR beam, and then measure the elapse time when it rec... |
H: How much silicon is required for the most common ICs?
Where can I find information about the die surface for various ICs? I'm thinking about opamps in the first place.
The surface area is of course dependent on the features of the ICs (for opamps rail to rail, speed, noise) and on the max current they can handle.
... |
H: Mask some part of devices in schematic
I have a question about working with Altium Designer Software. I put some devices in schematic, but I do not want all of them importing to PCB. I mean I want to mask some part of schematic in such way that software does not import those parts into PCB. Would you please tell me... |
H: Changing the frequency to an induction motor
I am currently having an issue with an induction motor driving a conveyor belt too fast.
It the connected to a Frequency inverter which is connected to a plc.
The inverter is sat to output 50 hz. But i need it to run in 4 hz or less.
Would it do any harm running it s... |
H: Differential gain of amplifier with current mirror and NO LOAD
Please consider the differential amplifier (Q1&Q2) with current mirror active load (Q3&Q4) as shown below:
simulate this circuit – Schematic created using CircuitLab
I know many questions have been asked already regarding this circuit on EE SE, but I d... |
H: Matte Film On LCD Displays
What is the technical name of the matte material/film that is put on LCD Displays?
Also what would be the method of applying such film on a blank lcd screen (if possible)?
EDIT: (Not my picture, but it illustrates what I'm talking about, left is film and right is no film)
EDIT 2:
Just in... |
H: Arduino: Did I damage analog joystick clicker by using analog instead of digital input?
I am using a thumb joystick for Arduino UNO, trying to work with it.
There are x and y values that I get with analog input A0 and A1, and one z value for the click that I should have gotten from the digital input D7, but unfort... |
H: 2n2222 NPN low side switch not working with 31V
I'm attempting my first slightly more advanced circuit and failing. I have a led string which I'm powering with a 31V 0.21A power adapter that came with it. Now I'm trying to switch it on and off with a 2n2222 NPN transistor which I'm controlling with a Raspberry Pi 3... |
H: listed ac motor horsepower doesn't match voltage and amperage
In my search for a bandsaw, I've come across a model that has an AC motor whose plate displays 3/4 Horsepower, but also 115/230 volts, 11.2/5.6 amps. You can see that the math suggests (115 x 11.2 = 1288, 1288 / 746 = 1.7) a horsepower rating which is do... |
H: How does a bathroom scale automatically power on when I step on it?
When I step on a bathroom scale how does the circuit turn on? I've disassembled these types of weight scales looking for obvious hardware switches, but none exist. I suspect the ADC is configured to generate an interrupt and wake the micro controll... |
H: What does low-impedance mean in the CMOS inverter circuit?
For the CMOS inverter the text states "once the transients have settled, a path always exists between VDD and the output realizing a high output (“one”), or, alternatively, between VSS and output for a low output (“zero”). This is equivalent to stating that... |
H: Shorted 12V wire to GND in ATX power supply. Did I fry it?
I'm a total noob, please forgive me.
I have several components that require 12V DC, and I decided to use an old computer power supply to give me the juice.
I snipped and stripped a matching pair of yellow and black wires...
After marveling at the results... |
H: Arduino Nano: How to decide voltage divider values that are safe for the input of the ADC
I am building a simple voltmeter circuit that needs to measure up to about 35 volts. Looking around the web, I am finding all sorts of suggestions for voltage divider values, like 1 Mohm / 10 Kohm, and the one I am currently ... |
H: Are built-in ADC converters in MCUs as reliable and accurate as their standalone counterparts?
This question is inspired by this comment by KyranF:
"built-in 24-bit ADCs" I wouldn't trust that as far as I could throw it.
How does a bathroom scale automatically power on when I step on it?
As the title plainly stat... |
H: Oscilloscope saving data unexpectedly
I'm using a Tektronix TDS 1002B oscilloscope.
I was investigating some glitch issues on pulses/square-waves and decided to save the time-series data to a USB drive in CSV file format to plot in MATLAB.
Input to the scope is a square-wave or pulse.
When I set the scope's Acquire... |
H: Identifying this input feedback topology
I'm confused between whether this is voltage or current mixing. I'm thinking it is current mixing since the input current is subtracted from the source current. But why cant it be voltage since Rb is connected in series with the input loop ?
AI: OK, I know what you mean - i... |
H: Architectures for High Throughput Data acquisition with embedded systems
Goal: to acquire a high-throughput ADC-generated data flow (1 Msample/s @ 16bits) into a System-on-Chip processor. Purpose: real-time data visualization and some (minor) processing in real-time
What are the pros and cons of the various archit... |
H: Can I use an AC motor to generate electricity which is mounted to a bicycle by a belt or I need it to be a DC motor?
I am trying to build a generator connected to a heater (250 Watts = 0.335HP). The energy goes to the motor from a bicycle.
So the question is: should I use an AC motor or a DC one?
AI: Anything other... |
H: Switching between two power sources
I am designing a circuit, which can use either 5V from USB, or some higher voltage (7-12V) from a battery. If both power sources are connected at the same time, I want some kind of electrical switch, that would disconnect the battery and power the circuit just from the 5V USB. Bu... |
H: Do I need buffer amps and zeners for SPI pins in a tiny IC chip?
I am currently working on a project using the MMA9555L pedometer chip (from Freescale Semiconductor Inc.) and establishing communications through an SPI bus going into an Arduino Uno. Below is a picture of the circuit I intend to use initially which i... |
H: Pulse width parameter in VI Characteristic curve of Diode
I was referring to the datasheet of IN4001 from Vishay
In Fig.4 (Typical Instantaneous Forward Characteristics), pulsewidth=300usec 1% duty cycle is given. I would like to know what this parameter is? In datasheet, there is no mention of pulse width it looks... |
H: GL850G without over-current protection
i am using the GL850G in gang mode for a circuit without over current protection to extend my available USB ports.
on power up the crystal starts oscillating for around 40ms then stops.
then i using a external USB hub with a GL850G it is working correctly.
my guess would be wh... |
H: Over voltage and reverse voltage protection of multiplexed ADC with voltage follower
I am designing a protection circuit for the ADC section of a design I am working on.
There will be 8 analog signals being read by a single pin of the MCU via an 8 channel multiplexer. The analog signals each go through a voltage d... |
H: Advice on 4th-Order Bandpass Filter
I am trying to design a 4th-Order bandpass filter with the following specifications; centre frequency 30 MHz, bandwidth 5 MHz and of course minimising loss.
I present my current design below which I determined using the ELSIE simulation design program. The problem is I am not ver... |
H: How much does the physical size and shape of a RF antenna affect its range/penetration?
I'm curious about the physical propterties of the tiny antennas inside many embedded devices (so ~2.4ghz if frequency matters).
Made this graphic to reduce typage:
Red Circle = target
Grey bar = concrete obstruction
Black bar ... |
H: Ripple at Resonance?
This parallel LC circuit, energized with a current source, is supposed to work as a low pass/high pass filter depending on the branch I take the output from. PSPICE simulation shows exactly that, EXCEPT there's a spike at resonance(157kHz) where the gain explodes. I did some googling and appare... |
H: How to determine gain from a bode plot
Given this bode plot from an OP-Amp Amplifier:
What is the method for determining the voltage gain?
AI: The method of determining gain is to look at the Y axis for the frequency of interest. A Bode plot is log(gain) as a function of log(frequency). Basically, it tells you g... |
H: Shift register - counter
So i have this shift register
With the initial values of ABCD (1101)
And the question is, how will this change after 4 clock pulses.
As I understand it, this shift register goes shifting the values from left to right. My first guess was basically taking the the lsb and putting it in first ... |
H: Connected 12V-1.0A transformer instead of 12V-1.5A
I'm using an Inspire 2.1 2400 audio set -
https://www.cnet.com/products/creative-inspire-2-1-2400-speaker-system-for-pc-2-1-channel-21-watt-total-black-series/specs/
The set comes with a 12V-1.5A transformer, and I just connected a same-voltage-lower-ampers (12V-1.... |
H: How to control the output voltage for the different types of the DC generator?
Generally DC generators are classified according to the ways of excitation of their fields. There are three methods of excitation.
Field coils excited by permanent magnets – Permanent magnet DC generators.
Field coils excited by some ex... |
H: What does it mean to establish the state of the internal node in CMOS circuit?
This is the NAND circuit and the 'int' is the internal node of the circuit.
It is seen that A = B= 0→ 1 gives the worst delay in the below table. What does it mean to establish the state of the internal node as stated in the text below.... |
H: Need some advice- Should I use the CORDIC FFT function or write code for an FFT function myself?
I'm currently working on designing a filter in VHDL for a project based on an FPGA. The filter would require FFT and I've heard about the CORDIC FFT function but never used it so I'm not sure how accurate it will be. So... |
H: Tesla Car "maximum torque at 0 RPM" - is this correct?
Tesla Model S Wiki
I've been watching youtube videos on this car, and everyone states that the crazy accelleration is due to maximum torque at 0 rpm. Doing further research, this car uses an AC induction motor, not a DC motor.
From my old lecture slides, I rem... |
H: 4 To 1 MUX - Figuring out the inputs
If i have a 2to1 mux together with logic gates like this:
I can simply create a karnaugh map and test the different values of XYZ and get a function.
From this i get the function f = x'z + yz + x'y
However in the next task, I am supposed to look at this 4to1 MUX
And decide wh... |
H: Troubleshooting why Powerbank Doesn't Charge Cell Phone
I have powerbank that provides 5v (presumably regulated) power, as typical of most usb interface powerbanks. I have been trying out my powerbank with different phones. It works on all except one. I have tried it with various USB cables, making sure I didn't ov... |
H: ATX PSU +12V outputs connected in parallel
I need +12V and around 10A for my project. Each wire on the ATX supply I bought is stranded 20 AWG and is rated for less than 10A. What would happen if I connected multiple +12V wires in parallel to divide the current among the thin wires? The PSU says that it can supply 1... |
H: Does "Common Mode Noise" only affect single-ended signals?
In the above illustration the common mode noise is hitting to both + and - wires.
Here is my understanding of the "common mode noise":
In a Single-ended system: the - wire is GND and + wire is carrying the actual signal, so the noise will only affect the +... |
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