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H: Simplest ATmega328P / Arduino PCB schematic for PC serial communication
I'm a little bit new to electronics. For a project, I needed the simplest possible form of Arduino board. The board will recieve data from the PC via serial connection, run some basic computations (using an Arduino library) on this data, and re... |
H: When does the transformer equation hold?
The "transformer equation" is as follows, $$\frac{N_s}{N_p}=\frac{V_s}{V_p}$$
What is assumed when this equation is used?
(Primary coil on the left, secondary on the right, in both cases)
Is transformer 1 an ideal transformer, or transformer 2 (I have seen both in books and... |
H: Problem with wide voltage range CC sinking
I want to sink ~10 mA of constant current at wide range of voltages even lower voltages like 10 mV, below circuit suggested to me in one of my older questions:
simulate this circuit – Schematic created using CircuitLab
The problem is when input voltage is zero, output wil... |
H: What might be inside my speaker switch?
I have a speaker switch which has been in continuous use since some time in the 1980s. It a QED SSU4. To my surprise, there are plenty of pictures on the net and even some for sale. Even more surprising, is that the prices are similar to what I paid new decades ago.
It c... |
H: Ideal inductor in DC circuit
If a ideal inductor of inductance L is connected to dc voltage say,V. How does the current change across it?
I tried writing kirchoff's law
\$ V = L \cdot \dfrac{di}{dt} \$
I got
\$ i (t) = i(at \text{ } t=0) + \dfrac{V \cdot t}{L} \$
is my try correct?
AI: The current-voltage relations... |
H: Why is an inductive load presented as a resistor on schematic diagrams?
The presentation of a resistor load, such as a light bulb, as a resistor on a schematic diagram makes sense to me. However, why do we present inductive loads as such, seeing it isn't a resistor as such?
AI: The resistor symbol is commonly used ... |
H: Best way to have circuit powered by USB when plugged in and battery when not?
I am building a circuit that uses a rechargeable battery and also has a USB port so it can be plugged in to charge the battery and power the system.
I am using a buck/boost converter to supply 3.3V for the circuit. I want the input for t... |
H: Electrical pole wires dividing
I would like to ask you very lay question. I know that there are 3 phases wires on this electrical pole on this picture. But where is neutral wire? I want to have more clear in this question.
Thank you
EDIT:
I thought until now that neutral wire is needed as output always. And so wir... |
H: Breadboard and Circuit Confusion
I'm still a noob to this stuff, and I've run into a problem I can not explain, or understand. I will need help translating / editing this into a real question for you all, so please bear with me.
ASSUME all else is connected properly (pin 1,2,8,9,15...)
See pictures below, this is a... |
H: LTspice model of the UC3845 oscillator
I have a circuit whose the purpose is to reduce the EMI by "moving" the switching frequency around a value. I would like to understand how this circuit affects the switching frequency, i.e. how it affects the oscillator frequency of the UC3845. For this, I need to understand ... |
H: Difference between junction points in old schematic
What's the difference between the black circle and the white one in this old schematic? Of course the black ones are junctions, but are the white circles a pin, or an input of some kind? I'm trying to redraw the circuit in KiCad but I can't find a way to express t... |
H: External power to WEMOS mini using 3.3V 1W Zener diode
I'm using a 12V DC 2A power source to power a 12V LED strip, and controlling it using a WEMOS mini and a relay.
Yes, I know there is a power shield for WEMOS, but I tried to regulate the 12v input to power the WEMOS as well, which did not succeed.
First I tri... |
H: Meaning of "A voltage source “likes” an open-circuit load"
I read a book "The Art of Electronics" by Paul Horowitz, Winfield Hill.
In the book, I saw some phases.
A voltage source “likes” an open-circuit load and “hates” a short-circuit load
A current source “likes” a short-circuit load and “hates” an open-circui... |
H: How does this audio power amplifier circuit work?
How do I simulate an audio amplifier in Multisim?
I'm required to search for audio power amplifier circuit and explain how it works in details so I need to know the detailed process of this circuit and understand how does it work?
also I found this circuit from here... |
H: Transfer Verilog Code to For Loops Syntax
I have built an block that does simple moving average on a "factor" numbers in the vector.. and its works good for my needs.
My problem with it that I think my syntax is bit dumb.
I have an array and I push my data into the array and using the factor trigger (can be 2,4,8,1... |
H: Is there any device or way to measure how many watts a computer's processor is using?
I know there's a device to measure how many watts a computer is using, you get an energy meter you plug the computer into it and it tells you
But I'm interested in finding out how many watts a processor uses.
Is there any device ... |
H: Multiple inputs for 5.1 audio system
this is my first post here and I hope I chose the right SE site.
I have a Logitech X-530 5.1 audio system, which is very old and supports input using 3 3.5mm jacks for Front, Rear and Sub (I suppose, green, orange and black jacks).
I'm currently using the system with the provi... |
H: PCB Crystal Layout
I'm designing PCB with 16MHz crystal for ATMega328p.
Right now that is my layout. VIAs ring around edge of board is to stop EMI radiation from edges.
There is no Ground plane under capacitors and crystal. Top layer under ATMega is Ground, bottom VCC.
Red is top, blue is bottom.
Crystal and MCU gr... |
H: Computer Instruction Format - Calculating the number of Opcodes
I found the following question on a different site:
A processor has 64 registers and uses 16-bit instruction format. It has two types of instructions: I-type and R-type. Each I-type instruction contains an opcode, a register name, and a 4-bit immediate... |
H: Differential amplifier IC vs op amp with resistors to make it amplify a differential signal
What is the advantage of using a differential smplifier IC instead of using a normal op-amp and designing the resistor network around it?
The ICs seem to be more expensive and require more power.
The application I am looki... |
H: YM3012 Analog Ground
I am trying to build a circuit using Yamaha Sound chip YM2151 with Yamaha DAC YM3012. This is my first attempt in doing anything with analog signals, so there is much to learn!
While reading a datasheet, I stumbled across the below schematic which shows Analog Ground.
Can someone please explain... |
H: Effective time constant of an RC circuit
I have read in some books that to determine the equivalent time constant of charging of a capacitor in any RC circuit containing either only one capacitor and any number of resistors arranged in any way or any number of capacitors arranged in any way and one resistor, we fol... |
H: Limit current through Force Sensing Resistor
I am using an ICL7660 chip to provide a negative reference supply to an inverting op-amp set up for a Force Sensing Resistor (FSR).
The minimum resistance of the FSR is about 1kohm, this means that for an output voltage of 5V from the ICL7660, the maximum current through... |
H: What happens when a program needs to use more than the allotted 16 registers?
I'm just learning about how programs work under the hood of a computer. We discussed how registers are a limited resource to the CPU. So what happens when a program is massive and needs more than 16 registers? I've tried looking this up a... |
H: Overloading buck regulator
I'm having a hard time explaining to myself why the output voltage of a buck regulator drops at the load when the load pulls more current than the max limit of the buck regulator.
Can someone help me understand this by assuming let's say I have a 3.3V buck regulator circuit that is rated... |
H: How to reverse-engineer/find datasheet for an IC
I have an integrated circuit in the form as a DIN chip, and I have no clue what it is. I have tried searching for the markings on the chip, which are as follows:
Top:
HDJ2100-393
937GA1925463B2WW
Bottom:
TAIWAN
937GA1925463B2WW
It is a 40-pin chip.
I found two of the... |
H: VHDL: Kan sequence of if/else be optimized?
I am new to VHDL and I try to find all places where I can replace if/else statements with cases of inlined OR/AND operations to get more things executed in parallel instead of sequence.
Now I have the following statement:
if (val = 0) then
returnVal := 0;
end if;
i... |
H: How does this voltage adjustment circuit work?
This is a real-world application. My circuit 101 knowledge is not up to the task.
I cannot understand the purpose of the portion of the circuit highlighted in yellow. With the presence of diode D3 and D4, I can't see that R_10K ever gets utilized. The only scenario R_1... |
H: What's the difference among these static protection bags?
I have some old modems & other cards stored in plastic static bags and noticed that a few of them were distinct... these are all from the 1990s or maybe early 2Ks.
Here's a sampling:
From left to right, there are:
Opaque and mirror-like
Translucent (this i... |
H: Cannot Find the Syntax Error Near Process
I'm very new to VHDL and this one must be a really easy question. The code gives me the error that there is a syntax error near the last process, please take a look:
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity fsm is
Port ( D : in STD_LOGIC_vector(1 downto 0);
... |
H: Extension cord to Power strip in old house
I live in a old house that has very old wiring. We got a small upgrade so we now have grounded outlets. I need to plug in a lot of devices into this outlet such as speakers, monitor and a gaming computer. So I bought the longest power strip I could find since I need to str... |
H: How to apply if-else condition of inputs and display the output on 7 segment display on Proteus
I am fairly new at using Proteus. This is my second time using it. This is not a homework question. I am trying to figure out, if i have 7 doors leading to a vault and 2 are main doors, 5 are internal doors. if any of th... |
H: Generation of a shorter pulse based on trigger (similar to 555 as monostable)
I need to create a shorter pulse based on a trigger signal. Trigger signal has a duration between 1 to 10 ms and the desired output should be 0.5 ms.
To do the opposite (longer output pulse than input trigger) one can use a 555 as monost... |
H: Cost reduction by eliminating vias from PCB design
I am designing a small (30mmX20mm) and not complicated two layer PCB. It is possible to do the design without using vias.
Is it possible to determine how much can I save approximately by eliminating vias from design?
Is it worth it?
AI: Basically, the cost break... |
H: Why a PMOS active load is used for a NMOS common source amplifier?
let's consider this NMOS common source voltage amplifier with active load:
For small signals the PMOS transistor M2 acts as a resistor of value \$\frac1{g_{mP}}\$ (P stands for PMOS) and so the voltage gain of this amplifier will be:
G = \$-\frac{g... |
H: SR Latch output pin biases state of the logic gate under special circumstance
I am having a really hard time putting my question in the right words, but I will try my best. So I am working with an MCU (EFM32TG11) that features a bootloader with pin activation. To make the process of booting into the bootloader as a... |
H: Additional Voltage on I2C Bus
I have redesigned one of my boards to the ICM-20689 (datasheet) instead of the ICM-20789 because of a voltage issue that I previously had. Link to previous issue.
A little background on my setup. The ICM-20689 is running on 3.3V with 3.3V on the VDDIO pin and 10k pullup resistors on th... |
H: Why is vivado so wasteful with its D-flipflop placement?
I have an implemented project in vivado, and I'm looking at the resultant layout between 8 slices:
As you can see, all 8 slices except one only have a single D-flipflop. This seems awfully wasteful. Why not put all of these flip-flops on two slices?
AI: Has ... |
H: What will gain be when both the zener diodes are conducting?
I have seen in solution that they have considered both 10k and 20k to be parallel when both the diodes are conducting. How will 10k and 20k be in parallel when zener diodes are conducting? Why are we not considering the drop across zener diode when both d... |
H: Why will i calculate the wrong power ,but right loading resistance in this circuit?
The question wants me to calculate that what is the \$R_L\$ value when we have the maximum \$P_... |
H: What happens when DC is applied to a piezo crystal?
I've heard that when an alternating current is passed through a piezo crystal it vibrates. But what happens if a direct current is passed through the crystal? I'm assuming depending on the direction of the DC applied the crystal either compresses or expands. Am I ... |
H: How can I protect a MOSFET bi-directional switch
I need to protect a MOSFET bi-directional switch made with 2 of IRF540 (VDS 100V) against potentially over-voltages on inductive loads.
Because isolator is slow (say ~1mS), I am concerning about the moment when SW just opens or closes into inductive load (a motor).... |
H: What is ADC Supply Current in Microcontroller and how much current will a GPIO take
I am having this Microcontroller
In this Microcontroller, I am using the ADC peripheral and normal GPIO port.
My questions:
On Page 58, table 42, There is a parameter called as Supply Current per ADC which is mentioned as 1mA. Wha... |
H: Is microcontroller power consumption directly related to its operation time?
I have to decide on a way to measure the efficiency of an algorithm running on a microcontroller/microprocessor.
My thought is that I can use the runtime of the algorithm to complete a certain task as an indirect measure of how the power c... |
H: Finding delay in a cosine signal
Is there a delay (or phase shift ) in the following cosine signal?
If yes, how to find delay in a signal? Will appreciate your help! Thanks!
AI: Cosine is sine but shifted in time 1/4 cycle. Your signal is a sum of at least 2 sinusoidal signals with different frequencies. Fourier t... |
H: Designing a Buck Boost Regulator 12V Circuit
I have been trying to source a Buck/Boost IC to design a circuit for my needs but I'm having a little trouble understanding how I would do this.
I am currently designing a circuit that will provide a regulated 12V output (around 3A max) from either a 12V battery or 12V D... |
H: How to turn on an LED when voltage drops to low?
I have an old vehicle from the 70's and it has a gauge for oil pressure. I want to add a 12v LED to the dash that will light up when the oil pressure is too low.
The installed sensor on the engine is restive to ground. The resistance changes as the oil pressure chang... |
H: Calculate op-amp input voltage with potential divider and series resistor
I have managed to confuse myself when it comes to calculating the voltage drop over a series resistor connected to a potential divider (See below):
The op amp non-inverting input is connected to a 20K resistor which is then connected to the ... |
H: What is the voltage on CD4017 outputs?
What is the voltage of "high" signal on "out" pins? Do I understand it correctly, that it is dependent only on provided Vdd and it is a little (approx. 0.5 V) lower than Vdd?
AI: CD4017 is a CMOS device, and as such, the output high voltage will be essentially the rail voltage... |
H: When is a wire considered high-Z?
I need to make sure I understand perfectly the high-Z state and its relation to voltage.I intend to explain what I have understood based on three example, is there something wrong ?
Let's consider the three following examples :
If the LED is red, the point 1 will approximatively ... |
H: Using too many Modules in Verilog affect timing?
I have a straightforward quest about HDL and FPGA design.
If I seperate my code to a lot of modules, by modules I mean verilog files which do specifig things instead of writing close to the top module, does it affect clk timing?
Ill try to illustrate my question:
the... |
H: Help deriving the transfer function of an LC circuit?
I have the LC circuit below. I believe (but I'm not certain) that this is a 3rd order filter. Since there are two capacitors and 1 inductor.
The circuit is a passive low pass pi filter. The component values have been chosen so that the cutoff frequency is 15kH... |
H: Why will i calculate the wrong current when i transform part of circuit to Thevenin circuit?
Here is the circuit in this question
The original circuit is in the left hand side,as we can see,there are two norton circuits in it,so i transform them to the thevenin equivalent circuit,just like the circuit in the right ... |
H: LED Driver Output - Current Adjustment Range
I bought this Led Driver(HLG-480H-48A) for my Strips that use around 43V 9A. I've never used a LED driver before and have got a few questions about them:
The output current adjustment range (according to datasheet) is from 5-10A. Does that mean that the driver "pushes" ... |
H: How to detect an unconnected LED with an ADC?
Let's consider the following simple example :
An MCU controls the lighting of an LED with the wire "CMD_LED" by switching the state of an NMOS transistor.
When CMD_LED = 1, the transistor is closed and the LED is lighted.
When CMD_LED = 0, the transistor is opened an... |
H: AC behavior of a capacitor
While under DC current capacitors cause open circuit as time goes to infinity but under AC current they flow through capacitor. As I know Maxwell described this behavior as "Aether current". Is this current under AC source actually caused by microwaves or how is it possible for current to... |
H: Avoiding ground loops with common-ground DAQ
I am looking to acquire data from several sensors on a machine, each of which are part of a control system featuring several grounds linked at a single central point. I need each sensor's signal at the point of measurement compared to its own ground at that point, while ... |
H: Reading a rotary encoder using a microcontroller and converting to Serial TTL?
I have an incremental rotary encoder (Bournes-EMS22Q) that I would like to have available on a wired network via RJ45 or via serial TTL (we have a serial-to-ethernet converter we can use Netburner SBL2E). This seems like a fairly simple ... |
H: Do electronics companies publish the diagram of their electric boards
I'm new to the electronics world, and I came to know that electronics companies (As Fairchild) provide datasheet for the components they produce (As IGBT, Triac, etc.).
Do electronics companies (As Samsung, LG, Sony, etc.) provide a datasheets & ... |
H: GPIO Open Drain LED driving
I was trying to understand GPIO open drain configuration. As far as I understood, to avoid floating output, one should use internal or external pull-up resistors. This is OK. However, I saw multiple times this driving LEDs example. I am kind of stuck here, because;
In this video and othe... |
H: How can I dim 50 high-power LEDs in series with an Arduino?
What I'm trying to do is to use an Arduino to control the brightness of two series of 50 high-power LEDs independently.
Each series has an independent LED driver, and each LED has a foward voltage and current of 2V and 700mA respectively.
What I want to do... |
H: In a linear time invariant system, is it possible for a SS response to exist, when we have a bounded input?
The answers provided showed that it is possible. I don't understand why. I think since it said that the input signal is bounded, it means that the modes of the signal are within the unit circle, so the forced... |
H: Signal Conversion 36V to Logic Level with Zener Diode
I have 8 cells in series and I want to check them, whether all are connected. I came up with the following schematic:
simulate this circuit – Schematic created using CircuitLab
My question is about R and how viable this solution is.
My reasons for calculating R... |
H: Is there a method to know the temperature value of a microcontroller?
I want to know if there is a method to know the temperature of the microcontroller to avoid its over heat.
AI: The vast majority of microcontrollers on the market today have some kind of built-in die temperature sensor. Often this is implemented ... |
H: Why is a square wave used for audio power calculations?
I am trying to read this datasheet (NXP TDF8546 Class AB Power Amplifier). On page 12, the power calculations are mentioned as
Po(max): RL = 4 Ohm, Vp = 14.4V, Vi = 2 V RMS Square wave
As far as I know, while calculating power calculations for any power ampl... |
H: Input impedance of grounded emitter amplifier with DC feedback
In AoE3 2.3.5.C (page98) it states the following (referring to the circuit in the image):
For instance, feedback acts to reduce the input and output impedances. The input signal sees \$R_1\$ resistance effectively reduced by the voltage gain of the sta... |
H: How to check with a simple multimeter whether an old lead-acid battery and its charger are still working?
I have an old (ca. 10 years old) 6V lead-acid battery and a mains charger for it and I know the combination worked years ago.
Now I tried to recharge the battery and the charger's LED turns on during charging,... |
H: Coded OFDM, interleaving, sensitivity, and narrow band interference
Coding (which is a controlled redundancy) and interleaving across sub-carriers protects OFDM signals from a narrow band interferer (CW) that could destroy one subcarrrier. It provides a kind of frequency diversity
Suppose we have an AWGN channel , ... |
H: Why do i get three different methods to calculate the same current ,but get three different current values?
I want to find the current \$I_R\$,and i used three methods,and i got three different
\$I_R\$ values,i hope someone can tell me where am i wrong!
simulate this circuit – Schematic created using CircuitLab
m... |
H: Understanding LED datasheet terms
I was looking through an LED datasheet for an LED I am using and came across some terms that I am not familiar with. I a new to electronics, and have looked on the internet for explanations, but they provide relatively (to me) in-depth and complicated answers.
(Continuous) Forward ... |
H: How do I make a battery voltage indicator using the battery being tested?
I am trying to make a circuit that will test if a 5V battery is under 5V, with the testing circuit running off the battery being tested.
I have seen other answers to this question, however they rely on separate power sources to power the circ... |
H: Matched biasing transistor vs. emitter resistor in current mirror
If adding emitter resistors can reduce the temperature variation in \$V_{BE}\$, why do we still need to find a matched pair of transistors to construct a current mirror?
AI: You are right about the emitter resistor reducing the temperature variation ... |
H: What is the flowing current through an inductor when the switching gets delayed?
Consider the following circuit in which the switching takes place instantaneously at \$t=0\$.
The current flowing through the inductor right before switching is \$ \tfrac{E}{R_1} \$. As the current must be continuous then it must be ... |
H: Different readings of voltmeter on simple circuit
Hi I am trying to learn the basics of electronics and puzzled by the following qucs simulation.
Why the readings of voltmeters are different? I would expect, by the way zero readings on both voltmeters as they are basically breaking the circuit one for another.
At... |
H: Transfer characteristics of circuits involving op amp with diodes
How should I approach such questions?
AI: Ask yourself for each case (\$V_i\$ positive and \$V_i\$ negative), what the output has to do to satisfy the fundamental (idealized) property of such an op-amp circuit, which is that the input terminals are h... |
H: MCP3008/ADuM3154/ESP32 - Corrupted MISO Data Line
I have 3 MCP3008's being read by an ESP32 on the same bus isolated by an ADUM3154ARSZ. I was reading each pin on the MCP3008's about every 10ms. I seemed to have a lot of jitter and after averaging the values I found them to be way too low. I then tried just reading... |
H: Do all USB cables have power lines?
I have a USB type A to type B cable, I took it from a printer. Now, I want to utilize this USB cable to make a 5V breadboard power supply. I will cut the cable and connect power lines to breadboard's power rails. But, I can't be sure if it is guaranteed to have cables for power t... |
H: Optocoupler - Emitter follower for driving an optocoupler
I have some troubles to understand the above circuit :
simulate this circuit – Schematic created using CircuitLab
The goal is to discharge the capacitor which was previously charged to 20V the most rapidly. (At least I think). The collector emitter voltage... |
H: Common mode feedback for current mirrors
I was reading the chapter about Op - Amp design in Microelectronic Circuits by Sedra Smith, and I have some questions about the so called "common mode feedback" (CMFB) which is used to control some current mirrors.
Let's consider this scheme:
The book says:
Relying solely... |
H: Why would a large resistor in series cause a different voltage reading?
I'm watching Electroboom and don't understand why the voltage drops when he touches the spoon. He states there must be a large resistance in series. Why would the voltage not already have dropped before touching the spoon if there was a resisto... |
H: Can de-ionized water be used instead of distilled water to prepare lead acid battery electrolyte?
I have a couple of Yuasa and Power Sonic conventional lead-acid bike batteries that I recently purchased for a very good bargain price from a seller. They are new and never used. But unfortunately, the seller did not h... |
H: Making a phantom powered power switch (not mute switch) with LED indicator
I want to create an XLR inline power switch (with indicator) so that I can turn my phantom powered microphone on and off as I please!
I have found a few guides online that explain how to create a mute switch, but I'm not sure that will work ... |
H: What do these numbers represent in this schematic diagram?
What are those 1 4 and 2 3 on both sides of the button? They look like having connected to same places at both ends, it looks like redundant cable to me.
So, what are they representing?
AI: Tactile switches usually have four pins, with pin pairs already co... |
H: What degree of magnetic shielding does a Kozyrev Mirror require?
After learning about kozyrev mirrors, I’m curious what types of fields they’re designed to shield. “The earth’s electromagnetic field” was all I could find. But does that mean just earths magnetic field, the field shown by a compass? Or also the the E... |
H: Can the HAL_ADC_Start(&hadc1) function be executed only once?
I am using STM32F103C8T6 ADC1 single channel continuous conversion mode to collect the ambient temperature, but I am not very clear about using the function HAL_ADC_Start (& hadc1) because the function is called once before the "while" loop of the main (... |
H: Does a turbine experience a countering electromagnetic force while it induces a voltage?
I am assuming yes, because of the law of conservation of energy. A certain amount of energy is required to turn a turbine. So if we want a turbine to spin as well as induce a voltage, then more energy will be required to do so.... |
H: Using Python to simulate an LTspice netlist
I am new to Python, and I want to simulate LTspice circuits automatically using Python.
I added the library ltspice and scripted a fair amount in order for Python to automatically generate an LTspice netlist I want.
The problem I am facing is that I don't know what comm... |
H: effects of hFE in emitter follower?
There are multiple hFE options for BD139s, with the higher hFE being slightly more expensive. What advantages or disadvantages, if any, would the higher hFE parts have in emitter follower circuit?
AI: Advantages of higher hFE:
Higher input impedance to the circuit
Lower output ... |
H: Efficient way of writing to flash memory without losing data
For my project, I am writing some code that gets some results and I want to store these results on external flash memory. The external flash memory in question is a MX25R8035F. I found that writing without erasing only works the first time I wrote somethi... |
H: Ideal voltage source connected with ideal Inductor
We have an ideal inductor with the dc source in figure A.
When switch is closed we get equal and opposite voltage across the inductor against the source voltage and a constant rate of rise of current given by di/dt = V/L. This constant rate of rise/change in curren... |
H: HC-05 Bluetooth RF transmit power
The datasheet of the HC-05 Bluetooth module says the RF transmit power is up to +4 dBm RF, but I think that is for boundary value conditions.
I am planning to use the it at a data rate of 100 kbps and distance will be up to 2-3 metres only, so will the transmit power decrease and i... |
H: How to check SMD capacitor for being shorted, without disconnecting it from the electric board
This YouTube video shows that you can check SMD capacitors for being shorted using buzzer mode, by touching the ground of the electric board with the negative terminal while touching each side of the SMD capacitors with t... |
H: Using voltage regulators for a computer harddrive
I've got an Intel NUC (NUC8I3BEH3) that's using its own 19V, 90w power supply (pictures).
After a few issues with 4TB 2.5" hard drives, and external USB disks, I'd like to use a 3.5" drive, but the NUC's internal SATA power connector does not support this (doesn't p... |
H: What happens to step down converter effiency when current consumption is very low
I'm planning to use a MAX640 (Maxim 9 V -> 3.3 V Step-Down DC-DC Converter) to supply a couple of ICs with 3.3 V.
In active mode the current consumption of the ICs are around 20 mA and according to the datasheet the efficiency of MAX6... |
H: What does the black point mean when we are calculate the inductance of several inductors which connected together?
What does this black point mean?i mean because what reason ,so we will say the inductance of the circuit below can be written as this,by the way , \$M\$ means Mutual inductance.
Also,i want to ask th... |
H: What gets wrong when I average AC voltage and current to get power?
Power is half the product of peak AC voltage and current (or product of its RMS voltage and current). But why is it wrong when I average first the voltage and current before getting the power?
I get that the average of AC voltage and current is zer... |
H: How to protect an input from ESD?
I would like to protect the input of a sensor (reference : MAX30001) from ESD.
In the datasheet, they say that the absolute maximum rating of this input is -0.3 V < Vinput < 2 V.
Do I have to strictly respect the given interval ? If yes, I do not know how to do it.
If I put a sim... |
H: Finding the wattage given on the bulb
Sorry for what might seem like a really simple question. I came across a LED bulb that has the following specs:
It is rated for:
120VAC (which I assume is just because the wall voltage in the US is 120VAC @ 60Hz)
14W power
14mA current
However, I don't know how they calculat... |
H: Help with ID of this chip from a Bluetooth speaker - top marking AWF ANG (AWFANG)
I am trying to find out what this chip is or what it does.
It is from a Bluetooth speaker which is not charging the battery. I have no idea if this is at fault, but would like to rule it out.
It only has pins on 3 sides, top and bo... |
H: What limits the maximum number of nodes of a RS422 bus? How to check if N>10 nodes is possible without repeater?
I have 13 identical devices which communicate with a host via RS422. None of them are addressable (they assume point-to-point connection).
I would like to string them in a RS422 bus. I thought of using ... |
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