text stringlengths 83 79.5k |
|---|
H: How does a signal to the CPU look
I studied electronics in a far away past and have sadly forgotten quite a lot. I was wondering what a signal to an 8 bit CPU looked like.
Suppose I want to send one word to the CPU, do I send 8 values encoded in a binary format or 1 value encoded in a 256-value scheme?
As in, does ... |
H: How to power 30 LED 9W downlight?
I bought a cheap LED downlight from ebay. The LED driver (spelt DRINER) that came with it, I do not trust - it is probably dangerous.
It states that its output is DC12-24V, 300mA. (which does not add up to 9W, if I'm not mistaken). When I tested it, its voltage was around 14V with ... |
H: Accelerometer double integration error
I wanted to use an accelerometer or IMU to measure speed and displacement over a period of about 1 minute or 400m. From this answer I found at stackoverflow, the error propagates at a rate of \$t^2\$ (without considering the rotation), so \$60^2 = 3600\$.
The noise density of ... |
H: Doubt about Poles of the Transfer Function
Why shouldn't the poles of a tf be in the RHP. I mean I know in a vague way, but what is the explanation/proof? Thanks.
AI: For a system to be stable, the poles of the TF must be in the LHP. RHP can have poles if the system is not stable.
I don't remember the textbook proo... |
H: how to compensate power drains in dc circuits?
This has been on my mind for a while. Lets just take any electronics device. Lets say a mobile phone or a laptop. They have fixed voltage and current, but some components needs higher voltage/current or both. At the same time some components drains power (meaning consu... |
H: How to modify a pulse with a very narrow on duty time to a squarewave like pulse?
I have the pulse as seen above. I need to convert this to a pulse without affecting its frequency but modifying its on time. It gives problem when sampling it for some reason, so I need to convert this pulse train to a one with aroun... |
H: what value is written onto microcontroller pins if i send the value as character type in Embedded c program?
#include<reg51.h>
sbit sw=P1^0;
sbit led=P1^1;
void write(unsigned char m);
void delay(unsigned char k);
void main(){
while(1){
delay(60);
sw=1;
... |
H: How do I solder a surface mount (smd) voltage regulator?
I have a PCB in front of me with a surface mount 5V voltage regualator. I'm wondering how I got about soldering this with just solder (I don't have paste).
I have heat paste, but I'm wondering if pre-tinning the pad and heating it up afterwards from the side... |
H: Verilog data input
Hello I am relatively new to verilog and need help on part of a project am working on. I need someone to guide me as to how you read data from an analog device. I bought an analog temperature sensor from sparkfun and am trying to read data from it. I can not seem to find any examples of getting ... |
H: Altium 3D not showing textures
i Finished my design and now im trying to make it fully 3D with STEP 214 models formwww.3dcontentcentral.es however as you can see even when im gettign the right models they just look like this, when the preview of the terminal blcok and the other compoenets actually look like the 2n... |
H: Arduino in Ground-Chassis (Vehicle): Activate by grounding
I am working with an Arduino as a controller for an Aftermarket Heated Seats Kit and interface for the stock A/C Auto Control Panel (the car did not come with heated seats, and I acquired an A/C Panel that has the LEDs and buttons needed).
To turn on the LE... |
H: How to connect large traces to pads in PCB?
I am designing a PCB, and 10 A-15 A current is flowing in a trace. I think a 300 thou track should be used for 1 oz Cu-thickness. I see that it is impossible to connect two pads with a 300 thou track, because it violates design rules and also other pads are included into ... |
H: How can a resistor affect current AND potential at the same time?
Though the resistor is always introduced as one of the most simple components it is the one which makes least sense to me.
Ohm's law defines the resistance as$$R = \frac{V}{I}$$ this means that the voltage is defined as $$V = I \cdot R$$ and the curr... |
H: Voltage regulator lm78xx for 220v?
I can see that the input voltage of the lm78xx series is 30-40v dc .
We are looking for a voltage regulators system , that will get the 220v ac , and turn it into a : 3.3v, 12v, 24v, dc .
I was thinking if we could manipulate the lm to do that .
I know we can build things, but we... |
H: How to implement an 8-bit CPU?
I'm trying to create a CPU, using 8-bit instructions, and there will be 9 or 10 of them.
I have an add, subtract, multiply, load, store, branch if zero, branch if not zero, print (to display), input (from keyboard), and return (exit program) instructions.
Addresses are 4 bits long, a... |
H: PIC32 Peripheral Pin Select for Digital Output
I'm using a PIC32MX250F128B for a project to drive several digital outputs; I need to control the digital output for about 13-14 pins. (using the code below).
These pins work: RA0, RA1, RB0, RB1, RB2, RB3, RB10, RB11, RB13, RB14, RB15
These pins do not: RA2, RA3, RA4... |
H: CCVS (current controlled voltage source) in practice
In my current project I'll possibly need to deploy a CCVS (Current controlled voltage source). It is transconductance amplifier or converter and many manufacturers offers transconductance amplifier but in form of a VCCS (Voltage controlled current source). In pra... |
H: Changed Op-amp, now signal is not centered
I'm making a pre-amplifier for my 9mm electret microphone to be read by an Arduino. Here's the schematic:
Note that the resistor I used connected to the output is 1Meg. My supply voltage is 5V.
Initially I used LM358 as the op-amp. When I plotted the output it seems to be... |
H: Transducing a changing capacitance
I have a capacitor C which changes with time. Now I want to measure the varying capacitance as a voltage function, so I need to design a circuit for that. My motivation around the problem is that, I want to apply a constant voltage to the capacitor always, so if I have a change in... |
H: Shortest time to visibly light LED
What is the shortest time (pulse 010) to visibly light a LED?
Visibly = The human eye can see the LED blink.
I use 5V as source and PIC16F628A@20MHz for the project.
Here is a datasheet for the particular LED (red).
Extra question: What is the shortest time needed for the LED to... |
H: Calculating resistance of series/parallel circuit
If I have a configuration of 5 resistors as follows:
simulate this circuit – Schematic created using CircuitLab
How can I calculate the expected total resistance between A and B, given only values for R1-R5?
edit: okay, here's what I've tried so far.
I intended to... |
H: AVR Assembler Labels
According to doc1022, p. 17 (AVR Assembler User Guide):
User defined labels which are given the value of the location counter at the place they appear.
My question is, what goes into the opcode when a label is used in a jmp and in an rjmp instruction since a label is really the value of the l... |
H: MOSFET explanation
Hi i bought some MOSFETs IRFP2907 to be specific and i get some weird behavior from them. I have been testing them by connecting the drain to the positive side of a 9V battery and the source via a led and a 1K resistor to the negative. the LED lights up no matter what i connect the gate to, even ... |
H: Making my own kotatsu
I want to make my own kotatsu (a small table with an heating element underneath) and I'm considering using a "heat lamp" as the heat source (one of those aimed at reptiles, fits in a normal light bulb socket) The one I bought supposedly draws 250W at 110-120VAC. Ideally, an Arduino mini pro tu... |
H: Custom board cutoffs pcb
I have been playing with the board shape, im planning to send this to OSH spark for manufacturing, however i have doubts about if they can do cutoffs of the boards like this or any other possible form i desire, or should i just stick to square shaped pcbs?
AI: Yes, OSH Park will do custom b... |
H: Emf interference on arduino and breadboard , using 74HC595 shift register, how to prevent it?
I’m using a 74HC595 chip (shift register) NPX semiconductors, connected to and arduino board. Basically the shift register switches on and off 8 leds in sequence.
Everything seem to be working, code and pin wiring to the c... |
H: How to identify the type of a microcontroller?
Assuming that we have an application which a lot of devices can connect and interact each other (like Internet of Things). Is there a way to identify the micro-controller that each connecting device contain inside? For example to identify if one device has a PIC or an ... |
H: Is it time to move from a 2 layer board to a 4 layer board
Below are two pictures of a portion of a PCB layout I did. The first shows the signal traces and the second shows the ground pour. U1 is an 8 MHz MCU, U3 an I2C sensor, U4 a RTC, and U2 a boosting power supply. The PCB is limited in size.
I don't have much ... |
H: Verilog Adding value in an always block. SIMPLE
module prizes(TESTSSD);
output reg [6:0]TESTSSD;
reg [1:0]equals;
always @(*) begin
equals = equals + 1;
case (equals)
0: TESTSSD = 7'b0000001;
1: TESTSSD = 7'b1001111;
2: TESTSSD = 7'b0010010;
3: TESTSSD = 7'b0000110;
... |
H: Transistor Series Regulator
I am in the 6th week in Navy school and we are on voltage regulators or circuits that have components that maintain a constant voltage output. I need an explanation on how to work out this problem here:
Find \$V_o\$ and the zener current where \$R_L = 1 k\Omega\$:
The answer is 11.3 v... |
H: What are appropriate probes for use with a HP 54501A Osciliscope
I'm fairly new to hobby electronics, but when my office remodeled (I work on software in an EE lab) they were throwing out a HP 54501A scope that I was allowed to take. It didn't come with any probes, and I need to know what kind of probes I should lo... |
H: When is a system's frequency response symmetric?
When is the frequency response of an LTI system symmetric, i.e. which property does it need to satisfy? Does it have to do with the system being causal (I believe this means that h(n) = 0 for n < 0)? If so, why?
Thanks!
AI: This property applies to any system whose i... |
H: Why is i2cset giving "resource busy" on my BeagleBone Black?
After trying to get Adafruit's 8x8 LED Matrix python example code to work on both my Raspberry Pi and my BeagleBone Black, I realized there is probably something wrong with Adafruit's code and not me. The matrix is working just fine with a Teensy3.1.
I d... |
H: How can I combine my knowledge of signal processing with electromagnetic physics?
Now at University I've learnt both signal processing and electromagnetics, I am curious as to how these two areas can be combined into one.
For example, in signal processing you are required to find the signal as it passes through som... |
H: IC SN74HCT245 Transceiver
SN74HCT245 is a OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS.
But i am not getting why we need it?
It basically transfers signal from port A to B or vice versa or isolate it.
Where we use it? Is it used as EPROM?
AI: The 74HCT245's obvious purpose is to achieve bidirectional transfer of by... |
H: Do I need a ground plane?
I'm a noobie in pcb designing, so i created this one single sided board, do i need do add a ground plane if I have a ground trace?
Cheers!
AI: Whether or not you need a ground plane depends on the frequency of operation of your circuit (which you have not told us). If it's a low-frequency ... |
H: Did TI make a mistake in this video when they tied two mosfet gates together?
Automotive Front End Protection
The two mosfets have their gates tied together, but that's all they are tied too. Will something like that work or are they missing a connection ?
AI: In the video they have told you to have a look at the ... |
H: need help analysing this BJT circuit
I need help analysing this BJT circuit. What I need to find is the equation for IB, IC, and VCE for this circuit. So far what I've got is from KCL :
a: I1=Ib+Ic
b: Ie=Ib+Ic
So I find that I1=Ie, and since Ic=hFE.Ib, I1=Ie=Ib(1+hFE).
Now, what I'm confused with is the KVL. Do I... |
H: What's the hold function on a multimeter for?
All it does on my multimeter is freeze whatever value it was reading at the time. When would I need to use this?
AI: I rarely use the feature but for more precise measurements it can be useful. For example if measuring a sensor I might want to make a note that the meter... |
H: Why do we need bulky filters at the input stage of SMPS designs?
I usually see costly and large filters at the input stage of switch mode power supplies. Isn't the AC signal already filtered by the large capacitor (the 100\$\mu\$F one in this example) after the bridge rectifier? What is the necessity of such an ela... |
H: Difference between an inverter and a buffer with active low input
In logic diagrams found in datasheets (e.g. Texas Instruments 74HC316) I've often seen both inverters and buffers with active-low inputs ("negated buffers" or "inverting buffers" or whatever they are called).
I wonder why they use differ... |
H: How to connect a jack lead to the input of a 741 circuit
Below is a diagram of a 741 circuit with a microphone attached, I've built the circuit and it works reasonably well. However is it possible to connect a jack lead to the circuit instead of a microphone? So I could connect a mobile phone to the circuit and pla... |
H: Selection of mcu
I wanted to learn to use mcu's.
Which is the best microcontroller to start off with?
The one that I have in mind is:
Small,
Easy to find resources for projects ,
Easy to use,
Easy to upload program to the microcontroller (doesn't require much hardware ),
Not picaxe (which is not available at my pla... |
H: Mealy machine to detect sequence of 2 inputs
I have the following assignment for a project at college and I have a few questions regarding it.
You are to design a Mealy state diagram for a digital lock. Assume that two debounced push-buttons, A and B, are available to enter the combination. An electromechanical int... |
H: Three-phase system question
I'm solving some problems on three-phase systems. I'm doing pretty OK, but there is one problem that I'm not sure about the answer so I have some questions.
We have a three-phase circuit connected in a star connection, which is balanced (since the three impedances have the same value). T... |
H: What is the role of resistor in this schematic?
I am a beginner in Electronics and I am not able to understand why do we need to put this resistor(Resistor which comes after the switch) in this schematic? Does it save IC from current? but how ? Thanks
AI: The resistor is called a pull-down resistor. If it were no... |
H: Analyzing MOSFET circuit
Here is the problem:
And here is my solution and I want to check if it is correct or not:
VDS > VGS - VTN --> device is operating in saturation mode.
VDS = VD - VS = 5 - (-5) = 10 V.
VGS = VG - VS = 0 - (-5) = 5 V.
AI: There is the equation $$I_d=K_n\cdot(V_{GS}-V_{TN})^2\cdot(1+\lambda... |
H: What is the difference between a 2 and a 3 solder terminals socket (coaxial jack dc)
I'm not pro with electronics and electricity and I want to replace my notebook socket so I'm looking for a coaxial jack dc socket but, as I only have two cables (a positive and a negative one) to solder to the socket, I can't see t... |
H: How to make the electromagnet of a magnetic-levitator?
I saw pictures of magnetic-levitators on the internet. That's amusing.
I wanted to make one of those. So I started searching in Google.
And I found out that these devices have a big electromagnet which is controlled by a micro controller such as AVR or by a p... |
H: How can a Ultralow Voltage Step-Up converters start up?
I've read about step up converters working from unbelievably low voltages (20mV), namely the LTC3108. How can circuits even start at those low voltages?
Diodes, FETs and BJTs shouldn't switch at 20mV.
What is the concept behind it?
Link to the actual IC
AI: ... |
H: Op-Amp difference amplifier low-pass filter
I have the following (summing, single supply) difference amplifier circuit:
How can I extend this circuit to a 1st or 2nd order low pass filter, with a corner frequency at about 20kHz.
AI: How can I extend this circuit to a 1st or 2nd order low pass filter,
with a corne... |
H: How to make a duplex 7 segment display
I have built the circuit below and have been using a 7 segment display which is meant to be designed to work with the circuit. However there is no clear diagrams showing which wire on the display connects to what pin on the chip. So I painstakingly worked out where each wire s... |
H: Reducing transistor switching time with a resistor from base to a negative voltage
Connecting a resistor from the base of a transistor to ground/negative voltage (R in the first scheme below) helps reduce its switching time. I would like to know why and how does it help; what are the benefits of such a connection a... |
H: How is 555 astable timing affected by a resistor on Vcc
I am trying to build a circuit that will plug in to a cell phone and let me read the value of a thermistor by generating a tone to the microphone, where the frequency is a function of the thermistor's resistance. I have a prototype in TINA, but my timings are... |
H: How to drive external LEDs using Digilent Genesys (Virtex-5) FPGA? How to use pressure or IR sensor input?
How can I drive an FPGA with Digilent Genesys X LEDS with a breadboard and socket 752 DIP? If the LED of range is zero + 445 and the impedence is 74 what is the range of the flash? This is for reconfiguring ... |
H: How to determine the transfer function of a system including disturbances
I'm trying to determine the open-loop transfer function of the system below (in order to determine PID gains).
If I account for the disturbance \$(9.81*6700)\$ in the system and use equation 2, I get very different results when I compare a s... |
H: Resistance of a Wheatstone Bridge
In the Whetstone bridge circuit:
If the circuit is balanced (and all resistances known), and we measure Vg as a function of time, then the fluctuations correspond to $$4K_bTR$$ the well-known thermal fluctuations. My question: what should be used for R here?
AI: R1 || R2 sets the ... |
H: Induced EMF of different wire shapes?
Given the following diagram:
Both conductors are moving at the same velocity, and the same direction, and are in the same magnetic field. They should induce the same ϵ even when their shapes are different?
ϵ = -vBL , my assumption that they should be the same.
My apologizes f... |
H: Connecting multiple SPI devices to Texas Instruments CC3200 LaunchPad
I want to connect one of the two (or both) 433 MHz RF receiver modules to the Texas Instruments CC3200 LaunchPad:
RFM83CL-433S1
RFM65CW-433S2
I also want to connect an SD Card connector to the LaunchPad at the same time. Is this possible? Is it... |
H: Why the \$F_{knee} = 0.5 / T_{r}\$?
In "High-speed Digital Design - A handbook of black magic" p. 2,
The knee frequency for any digital signal is related to the rise (and
fall) time of its digital edges, but not to its clock rate:
$$ F_{knee}=\frac{0.5}{T_{r}} $$
where
\$F_{knee}\$ = frequency below which most e... |
H: Spawning threads in SystemVerilog with input variables
I run onto a rather confusing situation where I was writing a code for a UVM monitor. This module performs these operations in order:
Listen to channel (virtual interface) until intercepting one or many
events on the pin-level.
Fill in a data structure with ... |
H: SDA line pulled low by slave always?
If due to some problem in slave, The slave is not able to leave the SDA line free , so that master can gain control over it. Its gets low by the slave in between data transfer , but not able to release it.
In this kind of situation how the controller can gain access of SDA line ... |
H: Using one channel from adc (pin connections)
For a heart rate calculator project by using Basys2 and VHDL, I am trying to connect ADC0808 in order to get 8bit digital output from my pulse sensor's output. However, although I designed the circuit according to datasheet, in the Basys2 board, it is seen that all the e... |
H: How to send a buffer with spi
I use an atmega32 and I want to use the SPI bus. I have the Adafruit 24 channel, 12 bit pwm led driver. I use a buffer to set the pwm for a certain channel.
The question is how to send the whole buffer via SPI?
My code:
/*
lat = ss
dat = mosi
clk = clock
oe = miso is not used because i... |
H: Controlling DC motor without Arduino motor shield
I am trying to make a line follower with the help of this tutorial. In the tutorial they have used Arduino motor shield. I want to know, is there any way to control the motors without using Ardumoto?
AI: You can't connect a motor directly to an Arduino. The Arduino ... |
H: How do I analytically list the correct sequence for the given digital circuit?
Suppose given the digital circuit below, which contains 3 JK flip-flops:
Assume that the sequence starts at ABC = 000. How can I analytically list the resulting sequence after every clock cycle?
AI: First, it helps to know that the cha... |
H: Could a barcode scanner be used to get surface depth information?
(if tl;dr, go to the part where it says "actual question")
this is probably a very obscure question, but: I'm working on a rather complex art installation with computer-generated sculptures, and I'm looking for a way to extract the "depth" informatio... |
H: Connecting LEDs to 220v without using a power supply
I'm designing a backlit custom picture frame, and I want to include the power supply (or the lack of one) inside the body of the frame.
The problem is, since the frame design is more or less thin, I don't have space to place a power supply, so I ran into this dou... |
H: Current always goes to less resistance?
I read in a book that "Current always goes in the less resistance path". In a paralel circuit with 1k resistor to one side and 10k resistor to another side the current still goes in both sides. Why does the current goes to both sides? It should only go to the 1k resistor caus... |
H: Can a DC motor be of specification 320Watts, 3A, 24 V?
The above is the specifications of a wheelchair DC motor I'm trying to use as my hobby project.
My question is how can a motor of 320 Watt and 24 V DC be of 3.0 A max rating when the current should be around 13 A?
AI: Sure, they can print anything they want on... |
H: Transformer voltage rating vs open-circuit voltage: what's the typical load assumed for the voltage rating?
This appears to have been asked in some way before (at Transformer: loaded vs open-circuited vs short-circuited) but both the question and the answers there are rather vague to me, so I'll try to be more expl... |
H: Why does USB signaling to microcontrollers need resistors
I'm currently trying to make a USB device with the ATMega16U2.
On page 187 of the datasheet, there are unspecified resistors between the USB port and the pins of the microcontroller
The Arduino Uno (R3) similarly uses these resistors in its design, with a va... |
H: Curious how does ALU addressing work like in Assembly code?
When writing assembly code, say R1 = R2 + R3, it is pretty easy to understand the addressing procedure because all registers are close to the ALU. But I find it hard to see how does the ALU go to the memory in R2 in instructions like R1 = R1 + M[R2]. It co... |
H: Maximum current draw from a step-up regulated output
I have a LiPo battery pack with 5V, 2.1A output. Now, let's say I boosted that with a step-up regulator like this Pololu module.
At 12V output from the regulator, what is the maximum current I can draw?
By conservation of energy, I'm assuming it cannot be more th... |
H: 'bridges' on a PCB copper layer
I've come across a design where each pad was connected using 4 'bridges' to the GND copper layar. What stands behind these 'bridges'? Why not make a full copper layer with only solder-mask defining the pads?
AI: No, they are not bridges, they are pads with thermal relief.
A typical ... |
H: Spread spectrum 400 KHz
I got a 6-phase DC-DC converter. Fsw=400 kHz, synchronization by external clock(CPLD). I need a spread spectrum 400 kHz. What's the best way?
All chips what I've seen before worked on MHz and above. Is there solution, based on FPGA?
Maybe someone has faced with that problem .
AI: You should... |
H: How do you determine how much flash/RAM you need for a microcontroller?
Let's say you are starting an embedded project with some known functionality. When you select a microcontroller how do you select how much RAM you need?
Do you use a developer board and code your project first and then see how much memory you h... |
H: Do we want output resistance of a transistor to be high or low
I have a serious doubt about output resistance of transistors. We say that output resistance of a device must be high, for example in BJTs, because it is actually a norton resistance in parallel with the dependent current source of small signal model. B... |
H: DS18B20 temp sensor IC
DS18B20 temp sensor IC Dq pin is connected to PSEN of controller in my application.
But in datasheet its mentioned that its connected to I/O port.
And second doubt is how I/O port senses temp? It should be connected to ADC pin of controller.
AI: DS18B20 is a digital Thermometer, thus you wil... |
H: Very small 12V DC power supply
As a second part of my bad question about voltage converters .
Well, I was asking about a regulator to get me from 220V AC/DC, into 12V DC .
A regulator can't do that , but today I got the Apple charger for the iPhone , that takes my 220v into a 5v , and its very small.
I think if yo... |
H: Magnetic flux outside a solenoid perpendicular to the direction of axis of solenoid
I know that using straight forward Biot-Svart law it is possible to calculate field inside a solenoid or at a point on an axis away from the circular coil.
Now is it possible to calculate the Flux outside a solenoid (OFF AXIS) in di... |
H: What is the maximum battery lifetime for a sleeping microprocessor?
I know it depends on the processor and the battery, I just want to know what's possible.
[EDIT:] An example would be great!
AI: A sleeping microprocessor might require 30 microamps. A car battery might have a 150 amp-hour capacity. Specifics vary w... |
H: STM32F4xx - Can EXTI_GenerateSWInterrupt() Wake Up Processor from Stop Mode
As the title states, can the function EXTI_GenerateSWInterrupt() wake up the processor after it is put into a low-power mode using the PWR_EnterSTOPMode() function? The documentation says that an EXTI interrupt can wake up the processor fr... |
H: What is the need for the extra resistors in this equalizer circuit?
I am working on a final project for my circuits class to design an audio amplifier. We are creating an equalizer circuit that has passive high pass, low pass, and band pass filters. Every where I search I find a design similar to this:
What is the... |
H: RFID tags inside metal items?
Is it possible to use an RFID tag inside a stainless steel enclosure? I am looking for a way to uniquely and easily identify a sensor. An alternative possibility is a laser engraved bar code.
AI: RF coupling
The "perfect" Faraday cage requires the metal to be a perfect conductor. Copp... |
H: Whats the difference between these three breakout boards for the ADXL345 Accelerometer?
I would like to use the ADXL345 in a schematic im working on right now, but as there is no typical/minimal circuit provided within the datasheet i got stuck.
I did a bit of research and found three different breakout boards, whe... |
H: Customizing pin orientation in Altium schematic library
In Altium, I want to have the Name of the pin in horizontal orientation while the pin is in vertical orientation like
But do not get the option in the pin properties dialog box.
Here, the tutorial shows how to change the orientation. But there is no option ... |
H: Trying to determine the output of a RC-filter with load
I have a low pass filter like this:
simulate this circuit – Schematic created using CircuitLab
\$V_{\text{out}}\$ is measured right after \$R_1\$, which I suppose means that it is measured over the parallel part.
\$R_2\$ is the load of the filter. When this ... |
H: How hard/possible it is for an engineer to make this happen?
I need to get one of these power supplies to use it in something I'm developing. The problem is that where I live there are no shops that sell this.
What I need is this:
If I'm not mistaken, this is a power supply with a special form factor. This is exac... |
H: Electric current of inductor
I have a homework problem that was solved by our instructor:
"Calculate the electric current of the inductor at \$t=0^+\$."
He calculated \$1/30\$ but the answer sheet was says \$-1/30\$.
Which of them is correct?
Our instructor's work:
AI: I would say that both answers are wrong. Im... |
H: AC-DC voltage doubler rectifier
I designed a 50 Watt voltage doubler rectifier with rated input 12 VAC and output 48 VDC. The circuit configuration and simulation result are presented in figure below.
2 unit IRFP460 power MOSFET implemented in this rectifier as switching component. These switches are driven by TL... |
H: Is PIC microcontroller PIC16C72 and PIC16F72 almost the same from a programmer's perspective?
I just wrote a program to use in PIC16F72. I was trying to simulate it on Proteus and I found that Proteus doesn't have that microcontroller in its library. I read somewhere that PIC16F72 and PIC16C72 are almost the same. ... |
H: How can I tell charge-only USB cables from USB data cables?
Like most computer hobbyists and programmers, I've amassed boxes of USB cables to connect USB, Micro-USB, and Mini-USB to chargers, computers, and gadgets. These cables are a mix of phone charger cables, and cables that came with external hard drives, bike... |
H: Determine the maximum load of a power supply
I am trying to upcycle an old bit of tech I had lying about. The main part I am looking to recycle is the power supply however I do not have specs of the power supply itself. I have measured an output of about 5.5V with a multimeter but what more can be done to calculate... |
H: Design a 4-bit PISO shift register with 4 DFFs and 3 AND gates
I want to design a 4-bit PISO shift register with 4 DFFs and 3 AND gates. I have gone so far that these two designs can be implemented, but I can't go further minimizing it so as to use 3 AND gates for the implementation.
If there is anyone having any s... |
H: Using a microcontroller as a microcode sequencer?
There's this thing called the weird processing unit, or WPU. It's basically an idea of various experimental processors (architectures) that try to be interesting, new, original, extraordinary, different or just plain weird. I'd like to build my own WPU, but just how... |
H: Help needed driving an old PIC programmer from Raspberry Pi GPIO
I have been trying to use a Raspberry Pi's GPIO pins to drive an old PIC programmer board that used to have a parallel port connection before I started messing about with it.
You can see from the clip of a schematic I found online that the data write/... |
H: Solving a Thevenin equivalent circuit
Suppose \$R_{1}\$ and \$R_{2}\$ are replaced by resistors of unknown values which are different from those assumed in part (a).
Using a variable external voltage source, a student applies \$+1.5V\$ between terminals a and b (a is positive relative to b) and measures a current... |
H: Microcontroller GPIO input voltage limit
I was looking at a datasheet for a microcontroller and noticed that, under its section for GPIO input voltage (p.14), there is no listed maximum for the high input, only a minimum. Does this indicate that, ensuring I keep current below the maximum (which I would assume to be... |
H: Question about IC regulators
I have a basic question about IC regulators that I know someone here can answer. Basically if I had an IC 7812 regulator in a circuit that has an input voltage of 14 volts, would the output voltage be 12 volts or 26?
AI: Well, there's no way the output would be 26V, but the older linear... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.