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H: Electronics Newbie : Can you switch from two voltage sources with a MOSFET?
Title and image describes it all, can you use one mosfet to switch two things with different voltages from one microcontroller pin?
AI: It depends on what's connected to J5 and J12. Without knowing the details, I would say you'll likely ha... |
H: For multiplexers, what are the pros and cons of Three-State Buffers vs "Straight Gates"?
This came up from my previous question when looking more closely at multiplexers. Wikipedia article shows two ways of implementing them. One with some Three-State Buffers, and the other that's just "straight gates", but notice ... |
H: RMS Current calculation from MCP3008
How to find RMS value of current from ADC value gets from CT??? . I have done like below
Made a burden resistor and voltage divider circuit for CT
MCP3008 connected with Jetson through SPI
5V to VDD
5V to VREF
From CT circuit output connected to ADC0 pin of MCP3008
I have plo... |
H: HAL_UART_Transmit_DMA function sending wrong data
I am trying to use UART with DMA,
before the DMA I tried polling method with while(HAL_UART_Transmit(&huart2, (uint8_t *)rs485TxBuffer, 17, 100) != HAL_OK); function and I could communicate successfully,
When I using the
while(HAL_UART_Transmit_DMA(&huart2, (uint8_t... |
H: Switch capacitive load with a PMOS
I want to switch a capacitive load with a PMOS once while running, then the continous current is maximum 13mA. The capcitive load is 2x10uF X5R, 1x1uF X5R and 1x100nF X5R, so pretty low series resistance and so I expect a pretty high current. Since the continous load is so low, I ... |
H: High voltage buck converter, voltage limiting bypass
I am designing a system for a 3.5 kW wind turbine that has a large input voltage range, from 0 up to say 750 VDC. The output voltage should not exceed 600 VDC. I would like to make a voltage limiting circuit. Do not worry I do not test any of this in my barn or b... |
H: Help with a RS232 (+-12 Volts) to USB converter
I have a device I want to communicate to with the following signals:
This is a programmable power supply, an IPS-405. I have determined from the image above, which is all that is available in the manual, that I need a RS232 to USB converter (null modem) that works at... |
H: Issue at programming the power supply via RS232 interface
I’m trying to program DC power supply which I recently bought via RS232 interface. When I try to send commands, I always get '0' value as a return no matter which command I sent. I’m hoping someone to point my mistake.
Device: UNI-T UTP3305C
COM Settings;
... |
H: Sensor output current vs voltage reading options for accuracy
I am trying to choose between two sensor output types.
Either 0-10V or 4-20mA.
I am using the INA219B to measure current right now but I am wondering if getting a different output sensor would be more accurate.
I understand current and voltage are very d... |
H: Amplitude vs Magnitude
Consider the relation between the output and input voltages: $$V_o=\frac{V_i}{2}(j-1)$$ where j is an imaginary number, and $$V_i=5sin(1000t)$$ Now, to find the amplitude of \$ V_o \$, should we look at the real part, i.e., $$\frac{-V_i}{2}=\frac{-5}{2}sin(1000t)$$ and say that the amplitude ... |
H: Can someone help me make this circuit work?
I am trying to implement the circuit described in this paper in LTspice. The circuit is shown below:
The paper claims that the circuit can be used to measure the resonant frequency of the coupled LC tank. By changing the voltage of the varactor diode, the frequency of os... |
H: Automated toggle circuit
I'm trying to build a automated toggle circuit which toggles in a certain frequency determined by an RC time constant. I made a circuit which i planned to toggle between 5V and transistor saturation voltage ( ground ). It does the toggle but only just once. I want the circuit to do it repea... |
H: How does the inductor current ripple influence a switch-mode power supply?
I am looking into several DC/DC switching controllers. When talking about component selection, many datasheets and application notes say that inductor ripple should be kept around 20-40% of the inductor current (TI buck-boost design applicat... |
H: Low Current (<500mA) Transient Current Suppression Methodologies
I am looking into possible methods of protecting against small current transients for use with a laser module and am having trouble finding information, partly because I am unsure what exactly to be looking for.
The laser generally runs around 180mA i... |
H: What makes signal lines hot swappable?
In MAX14780E datasheet, it's explicitly featured as "hot swappable", however in AM26C31 datasheet this isn't mentioned. Moreover, I suspect that I burnt one of the AM26C31 ICs while hot swapping.
I'm aware that hot swapping is also related with the connector (GND and power sho... |
H: ESD pins of CM1624
I am considering to design SD interface with a CPU. For ESD and EMI, there are some ICs that can prevent these issues with RLC filter and TVS diodes such as CM1624. What I am wondering about is that what are for ESD1 and ESD3 pins of CM1624?
Thanks.
AI: Those are just extra pins you can use for a... |
H: 1 input 2 outputs logic
I have a system that can only supply very low current > 10mA at 12v. It has one output that will pull high or low depending on if it is powered on or not. I have another device I would like to control based on that output, it has an up, common, and down. When connecting up and common it turn... |
H: How do terminate the coax shield of AC coupled LVDS signal? (isolated grounds)
I have an LVDS clock signal that goes to several PCB cards. Frequency: 100Hz --> 20MHz
I am going to use a fan out IC to supply each card with it's own buffered CLK signal; I am not going do a 'Multidrop Connection'.
PCB cards are isola... |
H: Building a 1S Li-ion battery pack with all the cells in parallel and using a DC to DC converter to get higher voltage
I want to build a 12 V battery for my Mac Mini and possibly a 36 V battery pack for a electric scooter I plan to make later using some old 18650 cells. I have read that a lot of battery management s... |
H: Why would a multimeter give an unexpected current reading?
I assume that the multimeter should read 2A for a 2A power supply, why is it only 0.358A?
Edit: After watching a video on the basics of using a multimeter, I realised that as well as short circuiting a power supply (which will break your multimeter), I was ... |
H: How do I use the 'generate' keyword in Verilog
I am trying to create a basic example of the use of the 'generate' keyword in Verilog, in EDA Playground. However, it gives me errors that I don't understand.
module CrossBar( clkIn,
inputs,
switches,
outputs);
pa... |
H: If I put an L298N between a 12V source and a 100W DC fan, what will happen?
The L298N stepper motor controller module has a driving current of 2A ("MAX single bridge", not sure what that means) and a maximum power of 25W. I don't understand what those power limits mean. Could it damage the module if the load exceed... |
H: Shouldn't the Thevenin equivalent have the same behavior (regarding the transfer function) as the circuit it's derived from?
I am new to electronics and I have a little trouble applying the basics I learnt so far. My problem is basically that I don't understand why we consider the second circuit below as the Theven... |
H: How does pulsing current through a better conductor generate more heat?
We are pulsing 20A, 12V current for electrolysis through a 6% KOH solution between two steel plates. Because of steel shortages, we have switched to a steel plate that is very slightly thicker. We are suddenly seeing 40C more heat in the syst... |
H: What is the capacitor in this typical application for?
I've been looking at the TC1252 voltage regulator (datasheet available here), but can't figure out what the purpose of the second capacitor (connected between VOUT and GND) in the typical application circuit example (page 3).
EDIT: Schematic Below
simulate thi... |
H: What's the name of this DC-DC topology?
I was helping some friends that wanted to add a light load to a DC power rail in an industrial installation. The voltage to this rail comes from an array of voltage sources, with one voltage source being selected at any given moment. The range of this rail is wide, 12 to 120 ... |
H: I2C and SPI which interface to use when?
I have seen I2C and SPI interfaces being used with EEPROMs and other ICs.
From an Hardware Perspective, what interface should be selected when ?
One obvious reason I can find is that, I2C uses only 2 pins whereas SPI uses 4 pins.
So, if we are short on IO pins, we can go for... |
H: Does the number of turns in Turns Ratio matter in transformers?
Suppose we have two transformers with same turns ratio, \$N_2/N_1\$. First transformer \$A\$ is of \$100:10\$ and the second transformer \$B\$ is \$1000:100\$. Both have same turns ratio so both can step down the voltage by 10 times theoretically. If w... |
H: Pull-Up resistor for a 74LVC1G06 Inverter
As part of dual mode display port design, Pin13 goes to 74LVC1G06 inverter input (see U89):
in case where I want to choose only HDMI I need to connect a pull-up to DP_0_PIN13.
from wikipedia : "Limited adapter speed – Although the pinout and digital signal values transmitt... |
H: Differentiator and integrator - without op-amp
I am trying to understand the working and function of the integrator and differentiator circuits using op-amps.
Can someone tell me why we need to use op-amps for that function? Selecting just the right value of RC components (appropriate time constant values) accordin... |
H: Is it possible to control a latching (bistable) relay with a single MCU pin?
Controlling a latching relay, like HFD2/012-S-L2 (datasheet [PDF]) with two MCU pins is straightforward:
And here is the corresponding code:
void switchRelayTx() {
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);
HAL_Delay(10);... |
H: PCB LED BIN/Group select?
Beginner in electronics, I'm trying to make a PCB LED under KiCad.
Everything is fine, but I can not understand the BIN (Group) forward voltage of the led ...
For example with OSRAM OSLON Square LEDs :
https://www.osram.com/ecat/OSLON%C2%AE%20Square%20GH%20CSSRM4.24/com/en/class_pim_web_ca... |
H: Autodesk Eagle check via layers
is there a way with Eagle to check all the via ?
I want to be sure that they are all vias from 1-16 layers.
I found manually a via 1-15 ( my mistake during placing it )
Is there a way with the error/rule checking ?
AI: I am working with Eagle 9.6.2. Eagle has changed quite a lot in t... |
H: Why impedance matching for only certain signals and not for other signals
I have a question.
Usually, in normal communication interfaces such as I2C, SPI or even normal GPIO interfaces, we don't associate them with impedance matching.
But for certain signals (I don't know which signals are those. But I have read hi... |
H: Amplitude Modulation Equation (sine or cosine)
I got an exam tomorrow and I'm still confused with something. I'm sure most people are familiar with the general equation of Amplitude Modulation.
AM(t) = (Ac+m(t))cos ωc t
I found that there is another variant of which cosine is changed with sine.
AM(t) = (Ac+m(t))sin... |
H: How to power the raindrop sensor when needed on the same Input pin of ESP8266-01S?
I have to set up an ESP8266-01S to monitor temperature, raindrop and also water-flow while at the same time controlling a pump. There is also a request to only power the raindrop sensor when needed to read but not permanently to help... |
H: Difference between open and closed center toroid transformer
I just want to know, what is the difference between open center and closed center toroidal transformer. Open center meaning the toroid has a metal rod in the middle while the open center doesn't have anything in the middle.
Open: https://my.element14.com/... |
H: True RMS Vs Area Under The Curve
I'm not sure if this is the correct place to ask the question, but here goes...
Using my DS1104z scope...
I measure a 60 Hz sine wave AC voltage and read 120 Vrms for a single waveform
but when I measure a single waveform using Math/ABS Function
( Displaying negative portion of wave... |
H: Trying to simplify a Boolean expression to \$X + Y + Z\$
Problem:
Prove the following Boolean equation using algebraic manipulations:
$$ Y + \overline X Z + X \overline Y = X + Y + Z $$
Answer:
$$LHS = Y + \overline X Z + X \overline Y$$
\begin{align*}
LHS &= Y + X \overline Y + \overline X Z \\
LHS &= Y( 1 + X ) ... |
H: Keeping ground traces separate from ground plane in Altium
I am building a sensorless ESC which uses low-side shunt resistors to detect current. Good practice dictates that traces of equal length and width be connected from the pads of the shunt resistor into the microcontroller, differential amplifier, etc., like... |
H: Is the answer to this JFET amplifier excercise right?
The problem is the following:
*TYU 4.14 For the circuit shown in Figure 4.59, the transistor parameters are:
IDSS = 6 mA, |VP| = 2 V, and λ = 0. (a) Calculate the quiescent drain current and
drain-to-source voltage of each transistor. (b) Determine the overall ... |
H: Does placement of resistor and cap in a button debouncing circuit make any noticeable difference?
I'm making a prototype PCB with an STM32 chip and I want a couple of tactile switches for various reasons. I have followed the button debouncing circuit as done on the dev board:
My PCB design is physically fairly lar... |
H: What's are the material properties that distinguish a magnetic containment disk from an induction cooker?
My picture below shows a coil carrying AC current, generating an alternating magnetic field. On top of the coil I've drawn a disk of high-permeability metal. Such as carbon steel, or mu-metal.
If the disk is m... |
H: Double secondary winding equal to center tap?
I am trying to create a power supply with both positive and negative voltages. Is it possible to use this transformer to create such a supply? : https://my.element14.com/vigortronix/vtx-146-050-215/50va-toroidal-transformer-2x15v/dp/2817652
Basically, want to use the ce... |
H: How is this potentiometer connected? Is pin 2 not connected? It makes no sense
How is this potentiometer connected? Is pin 2 not connected? It makes no sense...
The resistance between pin 1 and 3 is always the same, so why is pin 2 not connected?
(Image source: Electronics Area - 8 LED VU meter circuit using LM324... |
H: When to set defaults for VHDL generics
VHDL generics can have a default value.
The rules for how they are overridden in instantiations and declarations seems to be rather complex, so I wanted to ask about the easiest and safest practices to lower the risk of simulation and synthesis mismatches due to avoidable code... |
H: Converting analog voltage to drive interrupt signal in PIC microcontroller
I have a circuit that will output between 1v-4v when the circuit detect an event. When there is no event, the output voltage stays at 5v.
I want to use this as an interrupt input signal to my PIC18f4550 microcontroller so that when there is ... |
H: Full bridge rectifier for a 5 ns pulse
I want to build a system to measure the time of flight for a long transmission line. The length of the transmission line is between 500 m and 3 km. The attenuation of the transmission line is 0.00981 dB/m. The impedance of the transmission line is 150 ohm. A 3 V pulse fed into... |
H: Help identify ECG signal acquisition using AD2
I have recently got into electronics. I have access to an Analog Discovery 2 (AD2) kit with signal generator and oscilloscope functions.
I have been trying to teach myself how to use this equipment by building small, simple circuits.My current experiment involves buil... |
H: Why does my 120V 40W lightbulb only have 26 ohms across it?
I thought that if the voltage source is 120V and the lightbulb is 40W then the current would be 1/3 of an ampere meaning that the resistance of the lightbulb would be 360 ohms. But when I checked it with my multimeter, it was only 26 ohms. The multimeter i... |
H: Choosing the right op amp for ECG application
My current experiment involves building an electrocardiogram (ECG) as in this previous question.
How should I go about finding the right op amp for this application?
In my attempt to implement the circuit, I'm currently using the LM324 Op Amp from National Instruments a... |
H: Altium Schematic Compilation Error
I have a very simple schematic layout which is for a board that gets 5V from a header pin, supplies 2 TRS audio jacks (J1, J2) and carries analog output from these jacks to an output through different header pins.
I'm trying to make convert this schematic into a PCB and I get the ... |
H: 1-dB compression point is in the range of -20 to -25 dBm
I am reading the Razavi's textbook RF Microelectronics 2nd edition p. 18.
It says
1-dB compression point is typically in the range of -20 to -25 dBm (63.2 to 35.6 mVpp in 50-Ohms system) at the input of RF receivers.
I know the definition of dBm is a power ... |
H: As amounts of the 2 charges are given only by symbols , how do I determine the amount of charge of \$Q=CV~\$ of cylindrical capacitor?
The cylinder exists with the height \$d\$ and the radius \$a\$
The cylindrical shell surrounds that cylinder with the cocentric radius \$b\$
The space between of it has been filled... |
H: JTAG while running off HSI RC Osc
I'm currently trying to decide if I need an external xtal for my design that's using a STM32F103xF mcu.
The accurate timing requirements I can see being necessary are for programming the device over USB and possibly with JTAG.
I've seen that USB 2.0 is specced to requiring a freque... |
H: How did they get 240V from one leg (L1)?
A neighbor lost his L2 connection to his house. The symptoms were as expected. Fifty percent of the lights and outlets did not work and all his 240V appliances (AC, fryer) did not work. The utility company Xcel came out and installed a "black box" that gave him back his 120V... |
H: How to Identify my TFT LCD Driver Chip
This is one of my TFT LCD which I have no Technical details.
How can I find which driver chip they have used? I have previously interfaced TFT based on RA8875 driver. So I Have a basic idea.
I have read about chip ID for the driver. But Ra8875 did int mention anything like ... |
H: BJTs dangerously getting hotter as drawn current accumulating
I already ask a few questions on this project (so i won't explain everything again as it would be too long). I basically have a high power opamp (OPA462) to which i feed a signal (but i offset it with a voltage divider before in order to avoid negative ... |
H: Buck Converter Voltage waveform at the free wheeling diode cathode and anode
I am trying to understand the voltages at the free wheeling diode's cathode and anode in a buck converter.
During the ON-state (as in the above circuit diagram), I assume the voltage at the diode's cathode would be like a constant voltage... |
H: Buck Converter Switching Loop Area in Layout Should be small
I have seen recommendations in the datasheets of buck converters, that the switching loop area should be as small as possible. Can someone help me on what would happen if the switching area is large and how it might or cause harmonics?
Or rather, whether ... |
H: What causes harmonics in DC-DC Switching converters like Buck and Boost Converter
Can someone tell me what and how the harmonics are caused in the DC-DC Switching converters?
I tried to read this, but I am not understanding. Can someone please explain in simple terms
AI: Every signal in nature has its own natural h... |
H: Soldering Iron Temperature for Lead Free Solder (Sn99.3%, Cu0.7%)
Recently I bought this lead free solder (Sn99.3%, Cu0.7%), D0.6mm.
I have seen many suggest at least 350°C for soldering iron.
But I tried at around 225°C (between 200°C - 250°C), the solder still melt well.
All shinny
Some shinny some dull, a... |
H: AC analysis of voltage divider CE amplifier - how are non-parallel resistors treated as parallel?
The textbook I'm reading (Electronics for Guitarists by Denton J. Dailey) has this to say about the AC equivalent of the circuit:
The power supply voltage source VCC provides a low resistance path to
ground for signa... |
H: Accuracy of nema17 versus nema23 1.8 degree step
I am trying to decide on using a nema17 or nema23 for my 3d printer. I have already considered torque, but step accuracy is very important. I wouldn't mind moving the bed plate up and down much slower with a nema 17 if it was more accurate.
It seems that 5% accurac... |
H: Do AC input optocouplers require an ESD protection?
I intend on using a circuit I designed for detecting an AC input line for control purposes. One of the inputs will be accessed by third party users and a cable might be connected with a decent length(>3m). The optocoupler I intend on using(VOL628A) has a diode max... |
H: can somebody explain this sentence in better words?
what is the meaning of "reproducible Al values over time" and why should we need it to be reproducible over time???
and what is "production spread"?
AI: The text defines Ai as inductance in mH per 1000 turns and that it's only for cores with gapped centre leg.
Th... |
H: What is the purpose of a 0 ohm resistor
I recently got a pack of different value resistors, but some of them were zero ohms. Is there any purpose in using 0 ohm resistors?
AI: Yes, zero Ohm “resistors” are very useful. When strategically place within a design and board layout, they can be used to enable or disable ... |
H: two hdmi cables with different resolutions
I'm using hdmi cable to connect my raspberry pi 4 to an ips display of 800X480. when I use one cable, it display one type of resolution, but when I use other cable, it display different type of resolution. how is this possible?
AI: For older HDMI versions, such as HDMI 1.4... |
H: How can I identify this QFN IC marked GX?
I'm trying to identify what this part could be based on the top marking, GX, but I've been totally unable to find it online. I'm pretty sure the packaging is QFN, it has 16 pins, and I know it has something to do with LVDS. It appears to have two LVDS inputs and either two ... |
H: Basic RL curcuit problem
So I had an exam in basic electronics, which I passed but lost a lot of points on one seemingly easy task.
"Through the coil is passing a current equal to \$i_L=200\sin(10^5 t + 210°)\$. If R=5 Ohms and if L=46 microH, what is the current passing through the source?"
This is what I wrote:
... |
H: P Channel MOSFET's drain will not turn off in simulation
So I have the P Channel MOSFET's Gate-Source voltage as 12-12 = 0V. This means the Drain and Source should be disconnected. However, I still see a 11.3V output from the drain. I have no idea what I am doing wrong. The threshold for the Vgs is -2V, and I am gi... |
H: A/C voltage in the air?
I've been building a counter top dishwasher and just noticed that my sink is kind of grounded, around 30Megaohms resistance but 120V.
While checking that I also noticed the air near metal in my apartment has between 10-30V AC to the positive plug. Its enough to turn on small leds and confuse... |
H: Why do non-synthesizable commands even exist in VHDL?
VHDL includes commands like access ,new and shared variable that are never synthesizable or while and loop that are still somewhat synthesizable but are never recommended to to be used.
So why do they even exist if they cant be synthesized and are only limited t... |
H: How to calculate BCR421U LED driver external resistor to my specified current
I am using a BCR420U as a constant current for an LED indicator, the datasheet does not mention a formula for calculating the external resistor needed for a given current output, all I have is this graph.
My application uses 12-24 volts ... |
H: About simulating an ac circuit in Pspice
Firstly, It's not homework. I already know the answer. But I couldn't see sinusoidal waves to calculate phase of voltage(V0) across the capacitor. Response of capacitor is look like damping. However, the circuit is not first or second order circuit. In addition to this, (-j1... |
H: How do phase errors appear in the NTSC color subcarrier?
So, NTSC uses a YIQ color space, with the I and Q channels encoded in a color subcarrier using QAM with the carrier suppressed.
NTSC had a reputation for poor color reproduction—“Never Twice the Same Color”—and when I look up articles that explain the reasoni... |
H: Lithium polymer battery charging and management
Can someone help me understand this type of lithium polymer battery charging and management. I have the following battery https://www.alibaba.com/product-detail/plug-1-5-3P-704260-704060_1600233788440.html?spm=a2700.galleryofferlist.normal_offer.d_title.5e6663bbOehjQ... |
H: MOSFET drive circuit - purpose of C_BST and C_DRV
I was reading this application note from Texas Instruments, Fundamentals of MOSFET and IGBT Gate Driver Circuits,
(https://www.ti.com/lit/ml/slua618a/slua618a.pdf)
I don't understand - why is there a need for the C_DRV capacitor. Why is the C_BST alone not enough t... |
H: How to determine what kind of response this filter has
I have the next Sallen Key type filter
I have determined the transfer function and the coefficients of \$a_{0}\$ and \$a_{1̣̣}\$, based on
\$N(s)=\frac{Ka_{0}}{s^{n}+a_{n-1}s^{n-1}+....a_{1}s+a_{0}}\$
But then how do I use this to determine (or approximate) an... |
H: Low frequency gain and extra element theorem
I was reading 'Fast Analytical Circuit Techniques' from Vatché Vorperian.
Problem 3.7 states:
This is the circuit we wish to analyze:
This is the equation we must obtain:
I fear I misunderstand something important. From what I understand, the theorem never states that... |
H: Tips for placing small SMD components onto PCB
I am trying to assemble a PCB that has very small components, an example datasheet is below. I am using tweezers, microscope, and a stencil to apply the solder paste. But this is no match for shaky hands.
Most of the difficult components have pins underneath the modu... |
H: How to get 5V from 12V with server power supply unit?
My PSU has a connector for a GPU. It has +12 V, +3.3 V and GND pins (according to voltmeter).
I need to connect cages with HDDs to this connector. A HDD requires +12 V and +5V. Because the PSU doesn't provide +5V I'm going to convert either +12 V or +3.3 V to +... |
H: Problem of metastability: simulation of dual port ram
i simulate Dual Port Ram Register in VHDL and have some doubts about the metastability problem.
Dual Port Ram has 2 clock signal, one for Port A , the second for Port B. In my simulation I create two processes with 2 differentes clocks.
type memory_type is array... |
H: Timer maximum and minimum resolution
I am having a development board and it has system clock of 32 bit timer 48Mhz .if i want to find the maximum resolution with pre-scale value how to find it.
This pre-scale has 16 bits and how could i use it to make timer delay of 1 s or more
I know that 1/48Mhz = 0.02083us and 3... |
H: How to tell if pins are I/O from schematic?
I am using the Fusion360 New Electronics Library to reproduce the footprint/schematic of the NHS3152-AZ.
Following along from Tutorial: Creating electronic components with Fusion 360, at min: 8:09 they assign pin configuration values (I/O, I, O) by cross-referencing with ... |
H: Gates output waveform
I want to do the waveform of X output. How can I do this?
I am trying to use Tinkercad. There is an oscilloscope so I can see the palm.
I couldn't get Tinkercad to represent the palm.
It doesn't have to be done using Tinkercad but I thought it would be easier.
AI: Ok, I see three oscilloscop... |
H: 12V with 3.7V backup battery. Which topology is better for battery life?
I have an STM32 based vehicle tracking circuit with an SIM808. I want to use it in vehicle with an LM2596 regulator and a 3.7V li-ion backup battery.
I searched and found out that there are two topologies as attached picture. I need to know wh... |
H: Why is the op-amp not able to amplify this voltage? It's a straight-forward non-inverting configuration with ideal op-amps(LTSpice simulations)
So I have the following configuration (pretty straight forward right?)
But following are the waveforms of V_induced(the voltage to be amplified) and V_induced_amplified. A... |
H: Communication between PIC18F26K80 and DAC7612
I bought the DAC7612 and would like to make it communicate with a PIC18F26K80 microcontroller. It is specified on the Farnell website that you can use SPI communication, but there is nothing about SPI in the DAC7612 datasheet.
Indeed, the microcontroller must send 14 bi... |
H: P-Channel MOSFET Reverse Polarity Protection
why is it always that a P-Channel MOSFET is used with reverse polarity protection?
Can we just use an N-Channel MOSFET?
AI: You can use an N-channel MOSFET for reverse polarity protection, as attested to by these SE questions:
NMOS FET selection for reverse polarity pro... |
H: Isolating the solenoid and driving relay power supply
I am using a relay module to drive a solenoid based on the output from my micro-controller which provides 5v signal. Following is what the circuit looks like:
My objective is to hook up both relay module and solenoid to separate power supply so that they do not... |
H: What are the corrections need to be done to the below statements in order to make them work properly in Verilog?
int t=-1'd1; //trying to assign -1 to t;
bit vb[7:0]; // simple declaration
bit matrix[0:1][0:7]='{'{0,1,0,0,0,0,0,0},'{0,0,1,0,0,0,0,0},'{1,0,0,1,0,0,0,0},'{0,0,0,0,1,0,0,0},'{0,0,0,0,0,1,0,1},'{0,0,0,... |
H: Connect outer the Gates (AND ,OR)
I have the equation L=ABD+(A+B)(D+C).
I have this
I must connect those based on the equation.
What I did was to take the equation
L=ABD+(A+B)(D+C)
and make it simplier
so I have L=ABD+AD+AC+BD+BC
At my view I can't simplifie it more.
I must connect outter those Gates AND,OR base... |
H: Voltage/Current phase shift caused by capacitor/inductor
Im trying to understand exactly how a capacitor and inductor affect the RC and RL circuits and am not sure exactly what is correct. When I look online for phase shifts for these components it mostly talks about Current Leads Voltage by 90 degrees in a capacit... |
H: What is the "dangling transistor" in this operational amplifier equivalent schematic?
I was comparing the datasheets for the three related CMOS Op Amps from TI: TLC2252, TLC2262, and TLC2272. TLC2252 is the micropower version; TLC2272 is the high-performance version; TLC2262 is offered as a compromise between them... |
H: What does this schematic symbol looking like a capacitor with one side slightly folded over the other represent?
I'm not sure what this symbol represents:
It comes from figure 5-2 on page 19 of the data sheet for the ATSAM3U2CA-AU
Heres a picture of that page:
AI: This is one of the ways of representing a capacito... |
H: 4051 MUX as 8-Pole Switch
I am a beginner in electronics so please bear with me if this question seems stupid for you.
I have a circuit that I want to modify at certain points. All in all there are 8 modify points in the circuit and 8 modifications that short these points or place a capacitor in between them.
To pu... |
H: How to find the minimum and maximum voltage of this buck converter
I am using buck converter. 3.3V output & 2.5A part with 2.1MHz switching frequency.
I am powering my microcontroller with this 3.3V output. So, I'd like to find the output voltage tolerance of the buck converter.
Usually, to find the min and max out... |
H: Buffer before invert before buffer
A friend asked me a question (we are both quite new to electronic circuitry and logic, though varying degrees of tinkering and comp. sci. education).
The question is, why would a buffer have an inverter on both ends of the I/O? An example image would be:
Thanks! This is interesti... |
H: Is a sine wave (or any signal) that has no zero crossing still considered AC?
This question will most likely come down to semantics. A friend and I were discussing a point that his EE instructor made, that if you consider the output from a solar panel over more than a few days, it effectively is a cyclic wave, and ... |
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