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H: Why is there seemingly no delay in a block ram read
I am trying to learn Verilog and was curious why my FPGA's block ram seems to provide the data that I request instantly. I was expecting that there would be some number of clocks that I would need to wait before my results would be available.
On a traditional com... |
H: Touch application with PIC16F183x possible?
I could'nt find any information about touch applications in the datasheet from the PIC16F183x controller. Ist this controller fine for touch applications? It's in a list with supported devices for the mtouch library.
AI: While the part has no dedicated capacitive touch ha... |
H: Does computer memory record the zero binary state?
It's been two years since I started reading about electronics and computer circuits. I fell in love with the homemade computers and the possibility of building one by myself.
You will see: When somebody explains computer memory, says "There is, and there isn't" "T... |
H: Why do I get a triangle wave in this Schmitt trigger oscillator?
I'm trying to design a function generator that can generate square, triangle and sine waves, with frequency varying between 100Hz and 100kHz.
The circuit in the blue box is supposed to be a schmitt trigger with thresholds different from those of the N... |
H: Precision Rectifier Circuit to detect peaks
I have a question about speed at detecting peaks.
Essentially, my question is that I have a precision rectifier with a capacitor equipped to the end of it to smooth the incoming full bridge
rectified wave, which works 100%.
however I am concerned, as the application is t... |
H: Old laptop power brick > DIY current regulator > 20w COB LED - will it do what I think it will?
I have a salvaged 20W battery-powered work light: the housing and LED inside. Before the electronics and the original 7.4v dead battery got tossed, I hooked up a somewhat discharged 7.4v battery to it and measured 18.5v ... |
H: Current limiting resistor on peltier element
I have a 12v/22A DC switching power supply and 9 peltier elements rated for 12v/6A.
I would like to limit current to 2A per peltier element.
I don't know how to calculate the impedance (in ohms) that I need.
Intuitively, by ohm's law, every peltier element's impedance is... |
H: AGC (Auto Gain Control) Circuit Clipping Problem
guys once again back with a problem to my AGC circuit, however this is the last one.
The problem is the LM833N is clipping around at less than 1.92Vpp at a 4.586V Vcc, I understand this op-amp isn't rail to rail however it should be well within its voltage swing?
I... |
H: Altium: make a specific GND pad not to connect to GND pour
I have a 2 layer board design and I'm using the top layer for traces and ground plane.
Then I have an ADC and the -Vin pin is connected to a connector and both of them to GND but I want the -Vin pin to have one and only connection to GND through the connec... |
H: Attiny10 with RSTDISBL and USBAsp
I have some project what requires all GPIO pins of attiny10 so I have to program RSTDISBL fuse. But only programmer I have is low voltage USBasp (with latest firmware supporting TPI interface).
The datasheet offers the way to re-program attiny10 by applying +12V to RST when RSTDISB... |
H: Eagle library doesn't show up in search after activation
I am having some problems with adding a component in my schematic. I downloaded it from the official Autodesk homepage but I can't find it in the add list. I activated it and i changed the directory of the library? Any fix or solutions? I could not seem to fi... |
H: Analysis of a circuit with transformer, R and C components
I am not able to solve the above problem. I don't think my equations are wrong but I am not able to solve them. Please help me with this.
The answer given in my workbook is 3.93cost(3t+59.9)
Method A
Method B
This is not a homework problem. I was practic... |
H: Buck topology for a 3.3V to 1.1V for a SoC
I have been given this circuit in a design guide and it does not make sense for such a complicated circuit to be implemented just to get 1.1V out.
It requires 3.3V (input) and will give 1.1V out. The 1.1V is used to run digital functions in the chip; so I can imagine it po... |
H: IVPort raspberry pi camera module
Im trying to design multiplex camera system for my raspberry pi something like this https://www.tindie.com/products/canerdurmusoglu/ivport-dual-v2-raspberry-pi-camera-multiplexer/#product-description
Does anyone knows, what kind of chip is on a board like this, something like 14bit... |
H: Multiple I²C slaves with different addresses VS. using a multiplexer
I'd like to interface a lot of identical I²C sensors, let's say 32, with a MCU that has only 2 I²C busses.
I can configure each sensor to have up to 8 different addresses. Hence I can have 8 sensors per bus or 16 sensors in total which is not enou... |
H: Manually placing Rooms in Altium does not create a rooms
I am currently creating a pcb that will, at some point in future, be placed in a case that is not known yet. Therefore, the final PCB shape/size and connector placement is not determined yet.
I began to route functional groups in themselves, intending to not... |
H: Increase voltage and current with external power supply
I have an ECU A controlling a relay, in which when there is an activation command I can measure 12 V and 100 mA.
The project I'm working on is to replace that ECU A with an ECU B, but when I send my activation command to the relay, it is only able to draw 12 m... |
H: Turn off automatically - timer
I'm creating a simple circuit and I need it to turn on when I press a button and stay on for the time that I choose on the timer (choose the time on a potentiometer, and it needs to go from like a few minutes to 3 hours).
Eg. I choose 1 hour, press 'start', the light stays on for an h... |
H: Why is neutral wire connected to ground at the transformer?
I understand the use of ground wire at the home appliances but why is the neutral wire connected to ground at the transformer? Why doesn't the neutral wire go back to the power generation plants.
I found this image online.
AI: I understand the use of groun... |
H: Do I need to care about mounting hole contact oxidation?
I am designing a pcb which I have some mounting hole with the function to connect the mounted screw to the PCB ground.
I found good resources about this subject in the blog, like this one and this other.
However, there is one point that I am still in doubt: I... |
H: Code Composer Studio 6.1.0 debugger is not acting as it should
I am learning to code on a microcontroller from Texas Instruments, MSP430FR6969 (link), using MSP-EXP430FR6969 launch pad (link).
I am also using an IDE CCS 6.1.0 (link).
I am doing a simple odometer, where the program counts from 0 to 99,999 and then r... |
H: H Bridge only working one way
I have this schematic. My problem is it only turns the motor when I supply the 5v to the right transistor (Q2). I remove the 5v and put it on Q1 and nothing. I've replace all parts and still does the same thing. FQP27P06 has an Rdson at -10V, RFP30N06LE has Rdson at 10V. Is there so... |
H: Component identification - do you know what are the values of these components?
I am trying to identify the capacitance and resistance of two components that are soldered on a PCB.
The capacitor below should be 10 nF according to the datasheet. But its code is not 103. What's the value of this capacitor?
The resi... |
H: Amplitude Spectrum of FM wave from Bessel First order
given the values for \$\beta=5\$, for the Bessel of the first order:
\$ J_{0}(5)=-0.26, J_{1}(5)=0.34, J_{2}(5)=0.49...\$
in order to plot the amplitude spectrum of the FM wave, do you treat the negative numbers as absolute? The \$ J_{0}(5)\$ amplitude should b... |
H: Verilog assigning fractional value to integer
I am new to Verilog, but have some coding experience in VHDL. While reading someone else's code, I came across the following part:
genvar i;
generate
for (i = 0; i < 8; i = i + 1) begin : gen_for
integer p = (66.0*i)/8.0;
assign data[p + 1] = ...
My doubt her... |
H: Why should half-bridge driver have resistance in series with VCC?
I am using the three of the RT9624A half bridge driver as part of a 3-phase motor control circuit. Everything was working well in testing until I got to about 80% duty cycle and one of the drivers started getting hot. Probing it found that the low-si... |
H: RSET pin function of RTL8211E
I'm using Realtek's ethernet PHY RTL8211E, but can't figure out what's the purpose of pin 'RSET', and how to connect it. The only datasheet I can find is
here.
It's wired I can't get that datasheet from the official web page about RTL8211E/EG.
So, anyone can give some informations?
AI... |
H: What is the purpose of fifo in serialize of HDMI?
I'm trying to understand and study about HDMI. currently I'm referring with here (https://www.fpga4fun.com/HDMI.html).
But I'm confused that why does that fifo need for higher resolution?
in case of 640x480, they don't use the fifo in example. but why does the fifo... |
H: Difference between increasing microphone sensitivity and amplifying output signal in software
I am a bit of a newbie to the audio world, so please bear with me. What would be the difference between getting a high sensitivity microphone and using a low/medium sensitivity microphone and using some software like audac... |
H: How to map 0.40-1.87V to 0-5V?
I cannot seem to wrap my head around this. I have read about using an instrumentation amplifier, however even then I am not sure how to use this in this scenario. Could someone explain to me how to:
Map a voltage range of 0.40-1.87(V) to 0-5V
Map a voltage range of X-Y(V) to 0-5V, wh... |
H: How to compute dissipation of switching regulator considering the input?
I want to use a 5V 500mA to my circuit, also this will have a current spike for 1A. The input will be from 9V - 36V. I have reviewed the difference between the linear and switching regulator and obviously I should be using the switching regula... |
H: How to check (with DIY methods) if an Inverter returns a Square or a Sine Wave?
I do not have an Oscilloscope, but I want to check if my 12V DC to 230V AC inverter does produce a sine or a square wave. Any way to verify that?
I know how a sine wave and a square wave sound, so converting this to audio might be a pos... |
H: Watertight enclosures - what production steps are required to ensure no condensation on the insides?
Background
We want to waterproof an electronic device and the specifications call for IP-65 protection. To this end, we have selected a sealed polycarbonate box to put the electronics in. The external connectors are... |
H: Use crystal or oscillator for a Ethernet PHY?
I've saw so many reference designs use just a crystal to generate the clock for ethernet phys, though they can be generated with a crystal oscillator too. Such as KSZ9021's 'XI' and 'XO' pin.
Are there some special reason that a crystal is better than a oscillator here?... |
H: Minimum Clock Period from setup and hold time
I found several different answers to how setup and hold-time of Flip-Flops influence the minimum time between two rising clock edges.
tclock >= Propagation delay + tsetup + thold
tclock >= Propagation delay + tsetup
tclock >= Propagation delay + Max(tsetup, thold)
Whi... |
H: Do I need to connect the battery to send data to an ESP32 chip?
This may be a basic question, but I'm really new to electrical engineering.
I got an ESP32 chip with no micro-USB port. I got with the device a 3-Wire cable one side and USB other side. I have to connect these 3 wires respectively to TXD / RXD / Groun... |
H: Calculate maximum Interface Speed 32 Bit 100 MHz
I have a HSMC Interface which has 32 Bit width data word changing at 100 MHz. How is the correct maximum data throughput calculated?
Is it just dataword_length / clock_period [bits/ns]. And then I will convert to MByte/s. This is a question on the raw data speed (sig... |
H: Spectrum Analyzer Mode -- TX Duty Cycle With Time Domain?
I have a basic Rigol spectrum analyzer that sweeps across a range of frequencies and displays the amplitude of the signal.
When we go to a testing lab, their expensive spectrum analyzer has a mode where you put in a fixed frequency and it measures the duty c... |
H: FT2232H current consumption at 3.3V calculation
I would like to estimate the current consumption of the FT2232H chip
and I have some unclear issues with it.
In the chip's datasheet, it says the current for each voltage rail(except VCCIO).
In Digikey and a reference design that I have found it says that the chip c... |
H: Using RTC DS1307 in multiple programs
I'm kinda new to electronics and programming, but I managed to make a DS1307 RTC functional when it is used by only one program (I'm using C code). Buf if I try to use it in multiple programs at the same time, it occasionally gives me some strange dates and times.
For example, ... |
H: Long distance button
I have always had problems with my wireless doorbell solution. Since my driveway is around 50m (160ft) the signal is never quite strong enough to trigger the bell all the times.
So I was thinking about creating my own wired solution, but my question is how I would make this work.
Would a let’s ... |
H: Qi charging multiple devices with single transmitter
I am looking for a Qi charging compliant transmitter and have found kits from different manufacturers like ST/TI/Microchip. These kits have one receiver and are tuned to work together.
How can I build a transmitter (chip+coil) such that I can transmit power to mu... |
H: Do ferrite beads need snubbing diodes?
Inductors, when applied as inline power filters, need a parallel snubbing diode so that when the load opens, the current can be safely discharged.
In certain contexts, ferrite beads such as the Laird 28L0138 series can be used as inline power filters. These have nonlinear, mix... |
H: Is it Possible to control LED with arudino pins combined with PWM from IC?
What I'm looking to make is a multiplexed 16x16 LED grid with with 2-bits of brightness (aka 4 levels of brightness). There might be a better way to do this.
I've built a prototype 8x8 grid with an Arduino Nano, it works great. I have 8 pin... |
H: Question regarding ripple factor
For the pictures above, I am confused as how to how they got/derived the formulas for the peak to peak ripple voltage (VrPP) and Vdc. So far, I got the output voltage, which is 14.9 volts. However, I am also confused with that VrPP and Vdc mean as well.
Another question: How exac... |
H: Why I2S is better for transmitting audio compare to SPI
I am trying to understand why we use I2S is better for transferring audio than SPI as I2S has less bandwidth compare to SPI.
AI: There is a lot more to audio than bandwidth. The way I2S works, the data are provided just in time to be converted to analog. So th... |
H: Double the voltage did not double the amps?
I have two brand new AA batteries. I measured the voltage and current of each battery and they are both 1.5v and 5A respectively. I connected these same batteries in series and I measured the voltage. I expected the voltage and current to increase to 3v and 10A respective... |
H: Using a multimeter, can I tell if a lithium-ion battery pack is brand-new?
A few years ago, I ordered a replacement cell phone battery from Amazon, and while it worked, it didn't last as long as I expected. I wondered if the seller had scammed me by selling me a battery that had been previously used, so it gone thr... |
H: Do I need a BMS for Li-ion batteries connected only in parallel?
I have a device that runs on a single cell Li-ion / LiPo. The physical case for that device allows me to put in one to three 18650 cells. Unfortunately given the disposition of the cells, I can't buy a 2 or 3 pack already assembled.
The device already... |
H: Why does a fault lead to increased reactive power demand?
When we have a fault, say on one line out of three, the reactive power demands increase, which leads to voltage instability if the source can't provide it.
My question is, what causes reactive power demand to increase? Reactive power depends on frequency an... |
H: Understanding Vgs(th) on a datasheet
I am trying to understand the Vgs threshold on this datasheet. it says that the maximum is 1.45v but I have switched with 3.3 from a microcontroller. am i damaging the mosfet using this voltage?
AI: Maximum voltages and other limit values are specified under "Absolute maximum ra... |
H: How to calculate MOSFET internal gate resistance?
I was trying to figure out how to calculate the internal gate resistance of the MOSFET. For the purpose of analysis, Let's take the MOSFET as - BUK7Y3R5-40E
From most of the documents I read, best way to get the internal gate resistance is to measure it out.
With m... |
H: Is it really the Power required for comparing input and output?
Hi I want to drive a 5W (5V*1A) output... Can it be carried by a 10W input (15V*0.670A) ? Is it just the power needed? Or should I need a larger current than 0.670A ?
Is this applicable for LDO Regulators or/and Switching Regulator?
AI: The power outpu... |
H: Transfer function of a bandpass
i was doing some homework and one thing I had to do was to derivate the transfer function of a given bandPass. I have done it myself but i dont know if it is correct nor if i followed the right path / right assumptions. I'd be happy if someone of you could look at it and give me some... |
H: Battery Life Calculation, Sleeping and Wake modes
I have a circuit that consumes 1.6μΑ during sleep mode and 40mA during awake mode. The awake period lasts for 3 seconds and the circuit is on awake mode every 30 minutes. The circuit is powered by this battery (the link leads to the datasheet).
I used this battery l... |
H: Arduino VIN and usb toggle circuitry
Link to the schematic on arduino's website.From my understanding there is a comparator circuit in the arduino Uno schematic which turn off USB supply when there is a Vin present of greater than 7V by switching the PFET off.
What I don't understand is why there is the need for th... |
H: Effect of large capacitor for differential channel in S-parameter simulation
I have created a differential channel with Transmission line and interconnects for simulation. In the real channel, there is 100nF capacitor in between 2 transmission lines. Now the problem is when I put this capacitors in series while con... |
H: Capacitively coupled shunt resonator
The diagram below shows a capacitively coupled parallel RLC resonator. Through simulations I observe that C2 and C3 influence the resonant frequency . I'd like to obtain the analytic expression for the resonance and eventually calculate S parameters. What would be the good appro... |
H: Is this a 0.25% "precision" bleeder resistor?
In the AC input section of a PCB, I found a resistor (in parallel with an X capacitor) with 5 color bands:
BLACK - GOLD - YELLOW - GRAY - BLUE(LIGHT BLUE)
Sorry because now I do not have anything to take a picture of it.
It's probably rated 2W and the PCB is ma... |
H: Ethernet transformer saturation at low frequencies
I am using a 10/100BASE-T Ethernet transformer TG110-E050N5RL (Circuit A in the datasheet) in a circuit. I am applying a 60 Hz 500 Vac hipot across C9 (T1 pin 16 and T1 chassis ground) as shown here: . Pin 14 is open, to simulate a test stand failure. Nothing is co... |
H: Altium 18 multi-board design. How to connect 2 PCB's with a pin header?
I am trying to use Altium's multi-board design tool to connect 2 PCB's.
The PCB's will be connected with a right angle, male-male pin header (shown in image below).
Bottom PCB: Motherboard Top PCB: Daughterboard
My project st... |
H: Calculating Resistance
Can somebody tell me why R_o2 is RD
Why dont we take Rs into consideration ?
Their answer is Ro2=vt/it = Rd
My question is why didnt they take in consideration Rs and the current source?
AI: In your diagram, we can see a voltage controlled current source.
The control voltage is \$V_{GS}\$. A... |
H: What is the difference between MCU and TTL screens?
I'm trying to build a HDMI decoder board for a 4in 480x800 IPS display. I found an HDMI decoder board on adafruit(https://www.adafruit.com/product/2218) which says it works for most 40pin TTL displays.
The display I'm intending to use has 51 pins and says it has a... |
H: What is the meaning of output voltage and current?
I have a 5V power supply with DC output rating: 5V @ 1500mA. It could power my High Torque servo very well.
I, however, have a fairly used 9V Alkaline battery. I shorted this battery and I measured the current to be ~3 Amps using a multimeter.
Later on, I connected... |
H: Need a help with adjustable DC power supply
I just purchased an adjustable DC power supply.
https://www.amazon.com/Variable-Eventek-Adjustable-Regulated-Alligator/dp/B07DQR177D
It has three terminals : "-"(black), "ground"(green) and "+"(red).
When I test it with multi-meter, there is no voltage between the negati... |
H: Insulating from static electricity
I am happy to announce that my pocket extra-strong static electricity generator project is now complete and works well.
However there is one problem, I am often getting zapped severely (to the extent I get muscle contractions) by touching the wire that carries out the high voltage... |
H: Stepper motor power supply causing large ripple
I currently am rebuilding a machine that uses 3 large 24V stepper motors, running at 1A per phase.
The machines' original transformer has a 10V and 28V output, and I have tried limiting the 28V output to 24V, with varying degrees of success.
Below is the current desig... |
H: USB HID keyboard: why 4 URBs are generated for a keypress instead of 2?
This is system log when keyboard is plugged in:
usb 5-1: new low-speed USB device number 7 using uhci_hcd
usb 5-1: New USB device found, idVendor=04f3, idProduct=0103
usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
input: HID ... |
H: How to select Max. switching voltage and current of Relay for a LC resonant circuit
I have a LC resonant circuit as the above shows. And I want to switch the inductor between L1 and L2 with relays (sometimes L1 is used and sometimes L2 is used). The high voltage point between the inductor and capacitor has a volta... |
H: splitter design
I want to split the signal from my electric guitar to 6 amplifiers. Does this splitter design look legit? I want to use 6 FET op amp followers to do it.
R2 - R7 are 47R to prevent oscillations (they're not 1k).
AI: Providing the supply is a minimum of +/- 5 volts and you add decoupling capacitors to... |
H: adjustable window and adjustable reset delay watchdog Timer
I am using watchdog timer which have adjustable window BUT ITS RESET delay is fixed.This reset pin is active high during normal operation and during fault condition its gives 200ms low pulse. So how can I drive power supply using this reset pulse?
AI: As... |
H: Changing the LED in a circuit (to change its color)
I would like to change a LED in a circuit, in order to change its color.
The circuit is this one (LED on the right) :
First, can someone confirm that the "LED part" of the circuit "has a purpose" (I don't know how to say this), like explained in part 3 of this co... |
H: Reading values from Force Sensitive Resistor - Arduino
I am trying to read the values from a Force Sensitive Resistor with Arduino. Actually, I am already reading them, but it only works if I use a 10 Ohm or lower resistor and it really heats up. (See attached schematic). If I try to use a higher resistor, Arduino ... |
H: What is this part? Is it a speaker?
I found it in my parts bin.
I can't find anything about it when I Google on the number on the back.
Not visible on the picture but behind the net it looks like a speaker.
Am my assumption that this is a speaker correct?
AI: It looks to me like a common ultrasound transducer. ... |
H: Need a switch/circuit breaker that stops power supply to equipment when power comes back after outage
I need a switch that stops power supply(220VAC) to led tv when power comes back after outage. So i need a circuit breaker that breaks the circuit when power supply is off and needs manual switch on from this circui... |
H: OptoCoupler Relay and EMI - How to be sure it is not a "regular relay"
Motivation: A way to be sure a relays in hand are opto-coupler ones.
Reason: Due to AC power interference ( on the client side of relay - an AC motor ), I'm afraid wrong ones were sold.
Edit 1:
Attach 2 kinds of items both ( and there is some mo... |
H: How is binary data 'split'?
If one computer sends data, for example 001101, how does the other computer know, where one bit starts and the other one ends? If you were just to monitor the change, you would get 0101, which is totally inaccurate. Is it just a timing thing? (I apologise if this is a noob question)
AI: ... |
H: T.I H-Bridge design with No protection diodes?
I am still on my struggle trying to design my own Brushed DC H-bridge with all N-MOS, still in the research stage and burning mosfets left and right.
I have come across this T.I design ,relatively recent.
The full document about their design is here.
On page 12 and pi... |
H: What's this certificate mark?
The bottom row has an ETL Mark, a double insulate, an FCC logo, not quite sure what that little house next to the FCC logo is but what I am most intrigued about is the logo above them, it looks like VI.
AI: CEC Level VI Efficiency standard. More info here |
H: Short antenna feedline
So this was talked about in the comments of a previous question, but not in great detail:
I'm using a 2.4GHz ble chip, with a chip antenna. The recommended layout for this chip has a capacitor and an inductor to convert its output to a 50 ohm feed line. This feed line is going to be less than... |
H: Will a standard 9V alkaline battery (300mAh- 400mAH) be able to supply 2.5A for 5-10 second at a time?
For example, I have a motor that needs a surge of 2.5A for a short amount of time from a 6V power supply.
Will any 6V battery able to supply that current? Even if let's say it has only a 500mAH. How does AMP ratin... |
H: how to identify transistor/IC by its model/product number?
How to identify(biasing/company/working sections) transistor / IC by its model/product number? or details ?Example: 2sc2078, 2n2219 etc.
Please help, i need to understand...
Thanks
AI: Do a web search for "[part number] datasheet". For example, searching f... |
H: gates operation in flip flop
The operation of logic gates in the flip flop is pretty confusing for me. If I am not wrong then the NAND and NOR gates provide output only when there are at least two inputs. But in case of the flip flop, the output of one gate is used as others input. Lets take SR flip flop for exampl... |
H: What does 600R@100M mean from RDA5807M datasheet?
I’m trying to assemble a bare radio module using RDA5807M IC. The most popular diagram I can find is this:
What the filter is used on vcc input?
That inductor sign, 600R@100M, what does it mean?
EDIT:
as this marked duplicate, i want explain i need just a component... |
H: Can a power supply be too powerful for a device assuming that the power supply is at operating voltage of the device?
Let’s say a device’s operating voltage is 5V and maximum current that it can draw is 5A.
Is it possible for a 5V power supply to have very low internal resistance such that a device that operates at... |
H: Can you calculate internal resistance of battery by shorting it?
Can I measure the current of a battery by shorting the circuit and by ohms-law divide the voltage of the battery by the current measured to get internal resistance?
AI: I would like to direct you here
BU-902: How to Measure Internal Resistance
For a q... |
H: Excessive voltage drop from LiPo battery
I am using a 750mAh 25C 3.7v LiPo battery for a custom electronics project which currently draws ~1.5 amps, far below the rated operating current of (0.75 * 25 = ) 18.75 amps. However, at the battery terminals (before any PCB traces) I am noticing a drop from 4.03v to ~2v, b... |
H: Measuring Non idealities in an op-amp
First time poster:
I want to learn about opamps. I am just a college graduate with no practical experience.
What I know:
A few basic high level applications such as
Hysteresis,
Voltage follower,
Inverting and non inverting configuration,
Various Filters, and
Oscialltors
All... |
H: Reduce supply from 4V to 3.3V
What is the simplest and cheaper way to have 3.3V 0.5A from 4V?
I'm developing a board which uses a SIM800 so it must have 4V 2A power input from 24V external power supply (I'm using a LM2596S adj, able to supply 4V 3A). SIM800 has 4V Vdd and 3.3V logical input/output.
The rest of the ... |
H: Drive 24V input (active LOW) using 5V microcontroller
I have a device that is activated by grounding a pin that is pulled up to 24V.
I want to control this using a microcontroller (ESP8266 which operates at 5V) using as little components as possible (no relays, transistors).
It is easy to ground the pin by just wri... |
H: Test current capability of a 24V 15A power supply
I have a power supply from a broken 3d printer. I want to test if it is still okay. It is specified as 24V, 15A (360 W). It is giving me perfect 24V at idle, but I wanted to test if it is still performing well under (almost) full load.
But what could I use to dissip... |
H: 5mm RGB Led built in IC
Is there any standalone IC do the same job this 5mm Led (standalone flasher and builtin control IC) does?
AI: The IC used inside these specialty leds are very very difficult to find outside of chinese street markets and you'd have to be pretty good at understanding chinese to find them. Th... |
H: How to use a relay to "lift" 12v ground of a two 12v battery system
First off, sorry about the long title as I don't know a better brief of my situation.
Project:
I am converting a bus into a trailer to be pulled by a semi truck 5th wheel style.
The bus has it's own electrical systems that I don't want to take awa... |
H: LCD SPI clock frequency with STM32L0 MCU
I'm designing a PCB that includes LCD Display NHD-C12832A1Z-FSW-FBW-3V3 (datasheet) connected to the STM32L071KZU6 microcontroller (datasheet).
I'm afraid that the SPI interface of the LCD will not work with the SPI clock from the MCU.
According to the MCU's datasheet, it sa... |
H: Total Device vs Total Package Dissipation
For my design I need a bunch of 2222A transistors with each transistor dissipating at maximum ~500mW of power. The transistors come in single packages, dual packages, and quad packages. The datasheet has it listed as "Total Device dissipation" for the single at 300mW, "Tota... |
H: How do designers know about kilowatt power of wind turbine generators like 1.5 MW?
Generators and transformers are always designed in kVA because designers never know about the load it will provide power to. Then how do we know the wind turbine generator will deliver 1500 kW or 2 MW etc?
AI: In most practical conte... |
H: Help making a 205 LED lamp
I had the crazy idea of making a lamp for my soon-to-be-born son. It is a bunch of LEDs (about 205.. yes I know...) representing a picture. The LEDs vary slightly in voltage and current specs, but I don't need all of them to burn full power regardless. So I plan on going with the 'safe' l... |
H: how is this conversion possible?
I was reading Morris Mano's - Computer System Architechture and My problem is the simplification of F = AB + A'C which was:
simulate this circuit – Schematic created using CircuitLab
which was simplified to:
simulate this circuit
I am confused why NOT1 was replaced with NAND4?... |
H: How is the amount of outgoing power controlled in a grid tie inverter?
I'm trying to figure out how grid tie inverters work on a basic level. From what I understand, the inverter would have to
monitor the grid wave
create its own wave exactly like the grid
make it a little bit higher voltage
connect the two and t... |
H: Mosfet's Vgs and rds
If I use n-channel MOSFET (IRF3205) for high side switch, I need a gate driver for that MOSFET to turn on.
For high switch the mosfets gate require higher voltage than it vcc.
I have to switch 50 positive supplies, so I have to give more than 50 V for the gate to turn it on.
http://www.irf.co... |
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