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H: What is the importance of dc-dc booster efficiency?
I am going through Texas instrument web bench design suit and get 40% efficiency for some booster circuits
if booster can handle the load (Vout and Iout) according to design given by TI
what is the disadvantage of having 40% efficiency over 70% or 85% efficiency d... |
H: Three CMOS Inverters with feedback
I have been working on this circuit many days. I just would like to know how it works. In my opinion, the key is in the feedback in the 2º CMOS, but I do not really know how to manage it.
All the information I have about the circuit is in the figure.
AI: The circuit is essentially... |
H: VHDL: Can't give a std_logic type a value of 0 or 1 (on or off)
I have the following code from one of the files in a project:
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;
entity twoplayermux1 is
port
(
--inputs:
show : in std_logic;
set ... |
H: AGND and GND - Grounding in Schematics
I have seen a few electrical schematics where there are separate symbols for grounds. "Agnd" and "Gnd"
Can someone help me understand what are the differences between those two and where to use "Agnd" and "Gnd" ?
And it would really help if you could provide an answer relating... |
H: Effect of submerging a laptop in isopropyl alcohol without removing batteries
It's common knowledge that water damage on many electronic devices can be mitigated using isopropyl alcohol at a high concentration.
Many guides have mentioned disconnecting the battery before using isopropyl alcohol on the device. It can... |
H: Signal to Noise Ratio and Inflection point (PSRR measurement in Oscilloscopes)
I have a 3.3V LDO for which I am supposed to do the PSRR measurement.
I have a keysight scope to do this. While looking at this PSRR YouTube tutorial from Keysight, I have a few doubts.
Around 5:20sec, he tell that there is wiggle in th... |
H: DC-DC PCB power plane on inner layer
I am currently designing a 6 layer board that has a couple of DC-DC converters on it. The largest one is a buck that transforms 12V to 5V with an ouput current of max 7A.
Layer 2 would be GND, layer 3 power. The others are signal/GND.
Is it good pratice to put the power plane o... |
H: Should I use two 2:1 mux or one 4:2 mux?
I am designing a circuit and I am not sure which solution would be more preferred in the design. I'd like to justify why I'd use two 2:1 mux instead of a 4:1, but I don't seem to be able to. To be more specific, it looks like I'd have option 00 01 and 10 in the 4:1 mux. In t... |
H: Feedback resistors and op-amp instability
I am a building a circuit which has a differential amplifier part. To keep things simple I have simplified the circuit to only show the relevant part below.
One thing from op amps which is still difficult for me is the selection of the feedback elements, that is, in what ra... |
H: What does 'shunt' mean in the context of amplifiers?
So the term 'shunt' is used to mean the following according to the Wikipedia page https://en.wikipedia.org/wiki/Shunt_(electrical)
In electronics, a shunt is a device which creates a low-resistance path for electric current, to allow it to pass around another po... |
H: Rotary potentiometer angle to voltage relation
I have a 10k rotary potentiometer which turns from 0° to 270°. I wire it to an Arduino with the middle pin (2) connected to an analog input (A0) and the other two pins (1 and 3) connected to 5V and GND.
simulate this circuit – Schematic created using CircuitLab
I kno... |
H: Perf board parasitic capacitance fries microcontroller?
Recently one of my mirocontrollers fried in a project on a perf board. Eight of the outputs are PWM, and aside from the power lines, there are no other outputs from the MCU. The PWM frequency is 40 kHz. All these output lines are routed to a connector with lon... |
H: Getting the wrong Thevenin equivalent resistor
Its been a while since last time I worked with circuits.
Im trying to find the Thevenin equivalent resistor to this circuit.
This is how I tried solving it.
The correct answer according to the solutions manual is 3 ohms. What did I do wrong?
AI: There are lots of way... |
H: Why are two-port networks able to use a dependent source but not an independent source?
A two-port network can be modeled as black box with two-port parameters provided the two-port network consists of no internal independent sources.
This restriction does not apply to a two-port network with dependent sources, wh... |
H: Crimp directly to PCB (or holes in PCB)
I know there are certain SMD components which can receive a Dupont male connector. I know there are ways to solder male and female connectors to a board directly.
As part of a manufacturing technique, I'm wondering if there is any way on the market to connect wires to a board... |
H: ADE7758 Power supply design
I am designing a power meter based on ADE7758 and I'm using the official documentation for examples; I will also use an isolating IC for the communication between the ADE7758 and the microcontroller. I have some trouble understanding why is the ground of the +5V supply referenced to the ... |
H: Proportional fair scheduling
I came across this section in the paper Providing quality of service over a shared wireless link, IEEE Communications Magazine:
Consider a very simple system with two users. The service rate (in a time slot) for user 1 is either 76.8 kb/s or 153.6 kb/s with equal probabilities 0.5. Fo... |
H: Which transistor to drive 24V door strike with Raspberry Pi?
I want to drive a door strike at 24V with a Raspberry Pi. The door strike needs 150mA. I think the current that a Raspberry Pi can drive on one pin is significantly weaker than for example an Arduino, so I really don't want to pick the wrong transistor.
T... |
H: Design input of the 4 bit adder
I have the answer. But i'm not sure how the input of the adder is derived.
Why is it a,b,1,1 for x and 0,a,b,0 for y?
Been searching multiple sources but i'm stuck. Trying to study for my exams.
AI: The X input is equal to \$ab \times 4 + 3\$. The Y input is equal to \$ab \times 2\$... |
H: Varistor in a DC circuit
I'm employing a Varistor in a simple circuit that will be used in a car. The Varistor is there to ensure that any load dumps / vehicle transients will not result in catastrophe for the circuit.
My question is this: Should I pass VIN through the Varistor, or should the Varistor couple VIN an... |
H: does proportionality always works when analyzing DC motors?
Let's consider this example:
a Trolley that can reach 36kmph when there is lite traffic with a current of 700A, and when the traffic gets heavy, the speed decrease to 20kmph.
now i want to deduct the current form these information.
so my question is, would... |
H: Current through relay
I want to control AC power switch 230vAC, I used this relay type Relay OJE series SPST. According to the datasheet, it can drive V=5v and the resistance through the coil is 125 ohm
I calculated to get the current through the coil by applying ohm's law and I have I= 0.04A. However, I have this ... |
H: Identifying a Diode: "1042 MZ"
I am organizing a bunch of components given to me; some of them not put in a labeled bag.
This SMB diode has the marking "1042 MZ" on it and I cannot find any references to this. And I have checked a SMD Code book without finding anything.
I am running out of good ideas :)
Edit:
Appl... |
H: Low pass filter giving sine wave ( triangular wave as input )
so i basically have a low pass filtering that is filtering a square wave and giving me in output :
As far as i know the square wave can be made with the sum of multiple sine waves
So the over/undershoot i have is due to the frequencies that are not b... |
H: Hi fi speaker impedance
I'm currently working in a charity shop.
We have a range of hi-fi units, radios, CD players etc.
We also have a range of speakers to go with them. Some are marked with their nominal impedance, others are not.
I am generally able to determine the recommended speaker impedance range for a par... |
H: Low duty cycle 12VDC to 120VAC inverter
I need to operate a small 120VAC motor for short bursts of 1 to 3 seconds using a 12VDC supply (it's for a remote antenna switch).
Operations are typically minutes to hours apart, so the duty cycle is very low. I don't know the precise power draw but it's likely in the 10-15... |
H: How to synchronize readings with the HIGH and LOW states of a PWM output?
I would like to oscillate GPIO infrared LEDs at a high frequency and compare the infrared sensor readings when the LEDs are off and when they are on. To do this I would need to synchronize the readings with the PWM. Currently, I can use a pse... |
H: Why does a two-port network have two degrees of freedom?
According to the following lecture https://www.youtube.com/watch?v=1dgdiws3Kl8&t=817s. A two-port network such as the following
can be expressed as the following simultaneous equation
$$a_{1}V_{1} + a_{2}V_{2} + b_{1}I_{1} + b_{2}I_{2} = 0 $$
$$a_{3}V_{1} + ... |
H: Designing a circuit with a "short-lived" switch with 555 IC
i am very new to electrical engineering and designing circuits and there is a particular project that i am working on that involves using a switch and a 555IC timer.
So basically my desired output logic is as follows (Note: I am using 2 different LED, gree... |
H: Transistor control through opamp
In the given circuit I want to compute the current going through R3 given the current of Rs (Rs is a shunt resistor.)
simulate this circuit – Schematic created using CircuitLab
What is Iout in terms of Isense ?
AI: This circuit consists of two cascaded dual circuits - current-to-v... |
H: Improving a permanent magnet alternator. Replacing magnets / reducing air gap
In the case of a 3 phase PMA radial flux type, used as a wind turbine, with magnets on the surface of the rotor, is it safe or even doable to stack another magnet with the same geometry on top of the existing ones, to reduce the air gap ?... |
H: Maximum value of back emf in dc motor?
I have already been searching for this but couldn't find something reasonable
I want to know that when will be the value of back emf maximum in a dc motor?
At no load or full load or half load?
AI: The back EMF is proportional to speed. As the load increases, the speed will ... |
H: Why does a rise in ambient temperature cause a base-voltage-biased grounded emitter stage to saturate?
This is actually exercise 2.9 in Horrowitz and Hill 2nd Ed. which is posed as:
Verify that an \$8 ^\circ C\$ rise in ambient temperature will cause a base-voltage-biased grounded emitter stage to saturate, assumin... |
H: Why does a thermocouple have two outputs (V+ and V-)?
Does that mean that there is two different voltages?
The potential is used to determine the temperature. (?)
I understand it's the seebeck effect dictates how the thermocouple works.
Apologies if I'm missing a simple concept.
I have had no experience with th... |
H: LT1510 as a CC and CV Battery charger
LT1510 is a battery charger IC that can be configured to charge any kind of battery pack, I am interrested about the circuit given in the application note referenced AN68F page 24/36. The IC is used a Li-Ion battery charger. I want to understand the circuit around the OP AMP U2... |
H: Do fuse tap turn off with kill switch?
Do fuse box connected circuits turn on and off with the vehicle?
I’m trying to connect my Arduino to my motorbike using a fuse tap to the fuse box. I want my circuit to turn on and off with the bike. I’m wondering if the power is cut off on the fuse box by the kill switch (or ... |
H: \$V_o/V_s\$ of given circuit
I'm trying to calculate $$\frac{V_o}{V_s}$$ of the given circuit, but don't really know what to do with the voltage dependent voltage source. As I'm not an engineering student, this stuff is very foreign to me and I don't know how to approach a problem like this.
Also, what type of fil... |
H: Is there a way to extend the length of wires for I2C connection?
I would like to connect a BME280 sensor to an Arduino board through the i2c bus connection. I read that i2c was not meant to be used over long wires and will not work properly over 50cm. I want to get it to work within 5-15m. Is there some sort of chi... |
H: How to get the memory state of SRAM on power up?
I am working on IoT authentication using a physically uncloneable function (PUF). I have read several articles which suggest that SRAM PUF can be used for that purpose. However, I want to know how can I read the SRAM memory state? Are there any existing implementatio... |
H: Why do laptop batteries have so many terminals?
Why do laptop batteries require so many terminals (upwards of 10 or more!)? Why not just a positive, negative, and a data pin?
All the phones I've used only have three terminals, and I would think these these are more or less comparable devices, separated by scale. Al... |
H: 60VAC measured when light switch is off
I'm replacing a fluorescent ceiling light with an LED fixture. I removed the entire chassis, ballast, etc, and now I'm just left with the hot/neutral cabling (no ground wire available).
I wanted to verify that the power was off before I started getting too touchy with wires, ... |
H: Voltage at comparator entrances
I have the following problem. I have to fill in the blank spots in the picture below.
I'm not sure how to answer this question.
My book just says:
If \$V_+ > V_-\$ then \$ V_{out}=max\$
If \$V_- < V_-\$ then \$V_{out}=min\$
Is there an equation of sorts that will help me solve thi... |
H: Help Identifying a capacitor WITHOUT a capacitance meter and no markings?
I have a DELL 2408WFP Monitor purchased in 2009 that I am currently using right now. I have an issue with that monitor where it runs hot and shuts off after a certain period of time. This could be due to a number of issues but with limited te... |
H: Why is this solenoid valve consuming so much power?
The circuit below drivers a pump and a valve, the pump works fine, the valve consumes much more current than I'd expect.
The valve is rated 2W at 12V (600mA) i'm more like 15W. The PUMP_DRIVE signal isn't PWM, interestingly using a PWM signal with D = 0.5 doesn'... |
H: Logic inside a 3 or 4 way light switch?
I'm trying to understand what is the logic or mechanism used in 3 way or 4 way switches, in order for all swtches to work so that no matter the position of each switch, the lights go on or off without any other switch affecting the others.
So, are they internally using any lo... |
H: How can I set a wire to one of 3 voltages from a simple digital controller (e.g. Raspberry Pi)?
Here's my problem. I have a device to control that needs to always have one of three voltages applied to it: 5V, or 6V, or 7V. And I need to be able to programmatically switch between them.
What I have available is a ge... |
H: ESP32 I2C pin routing
I have looked through several documents, but I haven't find found a clear answer which pins on ESP32 support I2C communication.
Can the I2C be routed to almost any I/O pins?
Are there certain pins which support I2C?
AI: According to Section 4.2 the ESP32 datasheet, any GPIO pin can be configu... |
H: Difficulties in KVL signs (RL circuit)
If we start from bottom left and rotate clockwise, then first we visit resistor negative terminal so I expect -Ri but the book says the below equation:
So why isn't the Ohm's law for the resistor negative? (I follow this famous convention in KVL, whenever you encounter the ... |
H: Guard Band Reduction in 5G compared to 4G
Why is there less guard band required for 5G as compared to 4G .For 4G guard band are defined to be 10% of bandwidth on each side while guard band for 5G are defined in 3GPP 38.101-2. For ex If we take 15 KHz SCS and 10 MHz bandwidth guard band for 4G would be \$10MHz*0.1*2... |
H: MCU near sensors or on external board
I currently work on a sensorbox which needs to measure analog signals (temperature, power consumption,..), digital signals (magnetic contacts, positions,...) and control digital switches (relays). All this magic is controlled by a PIC18F (has an ADC) and interfaced with a large... |
H: What is this diode bridge used for in this circuit?
I'm currently trying to figure out how this circuit work :
I found this in a microchip documentation dealing with DALI (Digital Addressable Lighting Interface) protocol. The DALI protocol is mostly used to communicate with lighting equipment.
I can already unders... |
H: Bit(map) matching in hardware
I want to check (in hardware) whether a bit is on (1) in a 64 bit number - the bit I want to check can be any bit but I'm only interested in checking that one bit.
I get the number -ie offset - of the bit as a 6 bit number eg if that number is 0 I need to check bit 0, if the number is... |
H: How to suppress a short circuit to prevent fuses from blowing
I have a circuit that is modular and one of the modules involves interfacing from an external relay.
Now this sub-module has a fuse set to blow a bit below what the main module's max current. (why put a fuse when the main module has over current protecti... |
H: Which footprint to use for LM324 SO-14 in KiCad?
I want to use the LM324 quad-amp in my PCB design. KiCad already provides the symbol in the Amplifier_Operational package. However I don't know which footprint to assign.
I tried assigning the generic Package_SO:SOIC-14_3.9x8.7mm_P1.27mm footprint which has the corre... |
H: Do need to solder on the pin headers panels on the edges of a protoboard or can I just attach them without solder?
I have my first circuit on an Arduino Protoboard, and I was wondering if I had to solder the header pins to the board like the other components?
AI: What you are referring to as a Seesaw, is actually a... |
H: Multi Transistor Circuit
I made a multistage transistor circuit to see, with such a high gain, what the output would be?
(Bottom Terminal to +5V, Top Right Terminal to Gnd)
I've seen circuits with three transistors in this fashion, being used to detect an AC source nearby. The base of the first transistor is conn... |
H: Comparing voltages bigger than V+ on LM311
I want to use an LM311 comparator to compare my 12V battery voltage to some reference I have, but I want it to output 5V so I can read it with my microcontroller. Due to this, I'd think I have to set the V+ pin to 5V. If I do this, can I still input 12V to it?
AI: The LM31... |
H: Did I solve the Thevenin equivalent circuit left of the terminals correctly?
I get $$v_{Th} = v_{ab} = v_{4Ω} = 0.8V$$
The solution is $$v_{Th} = v_{ab} = 1.2V$$
Isn't 1.2V the voltage drop over the 6Ω resistor?
AI: You are correct. The 2v source effectively eliminates the 6V source and the 6 ohm resistor in seri... |
H: RCD Live and Neutral Protection
I understand that an RCD device helps to provide protection against electric shocks when completing a circuit between Live and Earth wires, where the Neutral and Earth wires are separated before being wired into the consumer-unit/distribution-panel.
My understanding is that the RCD... |
H: How to switch a leaded solder soldering station over to lead free solder
I have a soldering station which used leaded solder. I now want to switch over to lead free solder and as such I want to clean the tip.
How can I clean the tip of the soldering iron such that I can use the lead free solder with it?
AI: In an o... |
H: Factor of 1/2 in RMS Voltage
Given the following circuit, I would like to calculate the Thevenin equivalent of the voltage in RMS.
I know that R = 400 [Ω]; e(t) = 40 cos(10^4 t) [V].
However, I can't understand why there is a factor of 1/2:
AI: It's a voltage divider.
\$V_{eq} = (e(t)_{RMS}R_2)/(R_1+R_2)\$... but ... |
H: Reading a high-speed rotary encoder with a Raspberry Pi
I'm trying to setup a Raspberry Pi to measure the position and speed of 8 DC motors that all have incremental quadrature encoders. At full speed (unloaded), each encoder ticks at 3.3 kHz. I assume that this means that I have to sample the encoders at >13.2 kHz... |
H: Why are GPU dies so much physically bigger than CPU dies?
I understand that the physical sizes of microchips are generally limited by silicon yields. The larger your chip is, the more waste occurs when you hit a defect in the silicon and have to throw it away, and at some point this becomes unsupportable. I've noti... |
H: Is there a way to secure an 18650 battery pack together without soldering, spot-welding, or an end cap kit?
I'm putting together an 18650 battery pack for an e-bike. The BMS is specified for 10s 36v 40a. I want to avoid soldering, spot-welding, or an end cap kit if possible.
I thought I would make each group of 10 ... |
H: Explanation results of RC simulation wih LTspice/Micro-cap
I built a basic schema with resistor, capacitor, ground and a battery in LTspice and MicroCap.
I used transient analysis mode.
I expected to see on a plot showing decreasing current and increasing voltage during launch eventually stabilising at 0A. For the ... |
H: Is it possible to only fill a Li-ion BMS partially?
I'm putting together an 18650 battery pack for an e-bike. The BMS is specified for 10s 36v 40a.
Is it possible to use the BMS with only, say, 2 or 3 of the 36v packs of cells I made? The use case would be for a lower capacity pack.
Edit: Removed part of question a... |
H: Why is grounding required in a transistor circuit?
This picture is given in my textbook regarding an n-p-n transistor circuit:
Why is the emitter grounded? Why can't it be directly and only connected to the negative terminal of Vcc?
AI: In most circuits the Ground symbol just indicates the point in the circuit tha... |
H: Digital multimeter
When we measure an electrical quantity on Digital multimeter (DMM) like current, if we dont get readings of small range scale we switch the range utill we get our reading, same goes for voltage. But what is the quantity for which we do not change the scale on DMM and why?
AI: ... if we dont get r... |
H: Uploading sketch with teensyduino
In case I upload a sketch to a teensy board via the Arduino IDE (teensyduino), should any of the TX/RX pins of the teensy be unoccupied?
AI: All of the Teensy boards have a dedicated micro USB connector for programming via the Arduino IDE. The USB1_DP and USB1_DN (for the USB port)... |
H: Is there difference in connecting these two jack connectors?
I'm making a pedal from this tutorial https://www.instructables.com/id/Overdrive-Pedal/ and the author is using this type of jack female connector:
But I already bought this type of connector:
The author's connector has 3 tabs to connect, and in step 13... |
H: Why often is used a varistor 7D471K for 220-240vac surge protection rather than a lower nominal voltage one?
In my "supposedly" surge protected power stripe there is a varistor for surge protection configured to simply short-circuit the entrance wires in case of surge.
Checking the model it's a MOV-7D471K that on M... |
H: Why doesn't the voltage of the load fluctuate in a Zener Diode circuit?
I'm very new to this field so sorry for this silly question.
What I've learnt is that when any number of devices are connected in parallel (and none in series with the battery) with the battery, the potential difference across all the devices ... |
H: Transmission Line with Short Circuit and Inductor as Loads
let's consider this situation in which the two ports of a transmission line are connected to a short circuit and to an inductor:
The transmission line is supposed to be lossless. My book makes a mathematical analysis in order to find the resonance frequenc... |
H: What will happen to TLV1117 (5V / 3.3V) from reverse voltage?
There is a step-down DC / DC converter that receives 5V input and 3.3V output
It powers the Atmega328P microcontroller.
TLV1117 TI
For the firmware of the controller, I will use the USBASP programmer. It connects to the ISP connector (MISO / MOSI / SCK /... |
H: How to identify branches of root locus from figure/plot?
How can we identify the branches in a root locus
For example How many branches do we have in this below root locus(i feel from its appearance to have one branch)
And how many branches in this below root locus(i feel from its appearance to have two branches)
A... |
H: Doubt in SR Flip-flop
I am a beginner in digital logic. Please clarify me the following
In case of set condition with Qn=0, i am getting wrong answer
Q_{n+1} and (Q_{n+1})' not complement to each other
I am not able to find out where i made mistake. Kindly have a look at the following
AI: Qn=0 has changed into Qn... |
H: What is this component, labelled as "RT" on the PCB?
Can someone tell me the name of the below component? It is labelled as RT on the PCB:
AI: This should be a Littelfuse SMD resettable fuse.
The miniSMD series provides surface mount overcurrent protection for applications where space is at a premium and resettabl... |
H: Switching between 2 power sources using just a switch
So, recently while making a project, I thought of a way to switch between 2 power sources just using a single 3 pin slide switch.
Would something like the image below work?
Where I connect a common ground to the middle pin and 1 power source to each other pin.
... |
H: Voltage drop in a conductor
My textbook, Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk, says the following in section 2.3.1 The Mechanisms of Voltage:
In regard to potential energies of free electrons within the conductors leading to and from the battery, we assume all electrons within th... |
H: PCB Design - How much length can I2C lines differ by?
I am designing a PCB that uses I2C communication and was wondering how much length the SCL and SDA lines can differ by.
EDIT: Clock frequency can be anything from 95kHz to 400kHz. Is there a standard?
EDIT 2: Pull ups are 10kΩ. Is it an issue if the pull up is ... |
H: Confusion in understanding characteristic impedance and input impedance of an open circuited transmission line
The characteristic impedance Zo can be derived by considering LC sections throughout the line with open circuit at the end of the line, and this value is independent of length of the transmission line but ... |
H: Max4080 REF pins
Bought the Max4080 module and as usual I read the datasheet after purchasing it. In the datasheet pin 6 and 7 are NC but on the module those two pins are connected as F1B and F1A:
What F1B and F1A pins is for?
Max4080 SASA means it has gain of 60?
AI: These pins are only used for the MAX4081. They... |
H: can not get required gain with gilbert cell on ltspice
I designed a very basic Gilbert cell using BJT's. The function is a DSB modulator where one input is a 2.5mvpp sine wave, and the other a 5vpp square wave. The current at the bottom is a simple current source with a biasing emitter resistor. I tried changing th... |
H: What does \$x^*(t)=x(t)\$ mean in signals and systems?
I am often seeing this notation \$x^*(t)=x(t)\$ or similar but I cannot remember when I saw it the first time and I cannot find anywhere that explains the meaning of that notation. What does it mean?
AI: \$x^*(t)\$ is the complex conjugate of \$x(t)\$
So, when ... |
H: Two different input in a buck stage?
I am designing a power stage using LMZM23601V3.
In normal condition there is no 5VUSB but only +15V, during programming there is no +15V and just 5V from usb, I want to protect the only component using 5V from +15V and that's why I am using a diode.
Is it a good approach or ther... |
H: Buck inductor current ratings
we are designing a buck using MIC23350 to generate 1.8V @ 2A.
Input - 2.5 to 5.5V - typical is 3.3V or 5V.
Switching frequency- ~1100khz.
Nominal current is ~0.5A, Max current can be 30% higher.
As per inductance calculation, with 30% ripple factor,
Min inductance value ~ 1.8uH (Vin = ... |
H: Why voltage regulators instead of voltage dividers for supplying power to loads?
I have to supply 80 Raspberry Pi's with power, so I began looking into it and found a power supply of 12V 20A (might not be enough current to supply 10 Pi's that typically draw 1.5A - 2A though).
This meant that I would need to drop 12... |
H: Esp 8266 - 01 module unable to flash or communicate
I have an ESP8266 module which is not communicating with the Arduino IDE serial monitor unless I press the rest button on the ESP setup. I tried erasing and reflashing the ESP8266 several times, but it doesn't work or respond to my AT commands from the Serial moni... |
H: I2C pull-up to multiple voltage question
Quick rundown of what's going on:
I am using two PIC32MX to both be masters of I2C. They will be remotely controlled to determine who is the master at any given moment. Due to redundancy purposes, they both have their own 3.3V regulator sourced by the same 5V.
My original ... |
H: Kicad: How to give nets / wires multiple names
I'm designing a switching power supply using a BD9G101G step-down regulator. The datasheet is here: http://rohmfs.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator/bd9g101g-e.pdf.
If you look on page 18 there is a simplified board layout (fig. 47).
... |
H: Voltage on a Transmission Line with Ideal Conductors
Let's consider a transmission line with Perfect Electric Conductors.
We know that if an external AC source is applied, we get a voltage waveform between the conductors which is function of the position (and also of time, but focus on the first dependence).
But we... |
H: Why does the forward voltage drop in a diode vary slightly when there is a change in the diode current?
I was going through Basic Electronics and Circuits by David. A.Bell and there it mentioned that the forward voltage drop in a diode varies slightly with a change in forward current - but there is no reason there ... |
H: Why is the input impedance of an emitter follower defined as \$\Delta V_{B}/\Delta I_{B}\$, as opposed to \$V_{B}/I_{B}\$?
In The Art of Electronics, chapter \$2\$:Transistors, page \$65\$, the author defined the input impedance \$r_{in}\$ of the emitter follower below
as \$r_{in}=\Delta V_{B}/\Delta I_{B}\$. Wh... |
H: Why Power remains same in a Transformer?
If we have a step up transformer then the voltage at the secondary side will be more than the voltage at the primary side. Since we all know that
POWER = VOLTAGE * CURRENT
and because voltage at the secondary side is now more than the voltage at the primary side.
So will i... |
H: 1000uF capacitor to protect 5v 30amp circuit
I wish to build a LED cube but have no experience in shift registers so I am building one with addressable LEDs that can draw 60mA each. I want to make an 8x8x8 cube so that would be 512 LEDs and 30.72 possible amps of current or above 150 watts of power. These WS2811 "N... |
H: Will this setup trip RCD or cause any issue?
I want to mix a function gen’s output with a 50Hz mains signal which is stepped down by a 24:1 transformer as follows:
Is this setup safe? A scope will monitor the composite signal.
AI: Live and neutral are completely isolated from the measurement circuit. What comes in... |
H: Orientation of loop antenna (receiving mode)
I have done some measurements through a loop antenna similar to that shown in the following picture (all the information included does not refer to my antenna, it is a picture used only to show its geometry):
My professor has told me that this antenna was sensitive to t... |
H: Why do large power stations' generators rotate at ≥ 1800 RPM?
Some time ago, over some beers with a fellow EE who's much more experienced than me, we were discussing the unique challenges present in utility-scale power generators, like the ones in nuclear power plants. A single generator can be in excess of 1000MWe... |
H: What is name of semi-cut headers in KiCAD?
I'm looking for a "semi-cut headers" footprint in KiCAD.
Saying "semi-cut header" I mean a footprint which you can use either for soldering traditional pins or solder your board on top of other board.
Like on this image:
The questions are:
What is the proper name for the... |
H: What would be the output voltage of the full wave rectifier output when center-tap is removed?
This is the circuit I have been analyzing.
My intention is to calculate the output voltage at the resistance RL when the center tap is removed.
With center tap connection, output voltage VRL(DC) is calculated is given b... |
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