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H: Problem with 74HC76, silly mistake or possible fake?
I am a hobbyist and have been buying a few cheap ICs on AliExpress to play around with at home. I know that there is some risk involved in buying these but I seem to have had mostly good luck so far. A couple months back I received a batch of ICs that were defi... |
H: High Current voltage regulator. using 7805
I a have a battery that supplies a a voltage range of 11.1 - 12.4V depending on how charged it is.
I would like to regulate this down to 5v. The issue is I would need to draw up to 6 amps through it.
The voltage regulator i have access to is the 7805.
Looking at the datas... |
H: Battery output power calculated from internal resistance - explanation, relation to heat generation and actual power?
On a battery manufacturer specification (https://www.scib.jp/en/product/cell.htm, "High power 10Ah cell") it says: Output power 1800W* (SOC:50%, 10s, 25°C), *This value is calculated from the intern... |
H: Rain sensor + transistor
I have a Raspberry with a rain sensor connected. In order to avoid electrolysis on the rain sensor I would put a transistor (2N3904) in the circuit to power on the rain board only few times per day, read the sensor, then power off. I would ask if the circuit I drew is right.
In the scheme... |
H: Building a keyboard matrix
I want to build a 7 Rows x 15 Columns keyboard from scratch, thus I have started from the theoretical design of the matrix. The classic way should be to assign directly the Rows and Columns to (7+15) I/O of a microcontroller and also connect 7X15 diodes to every each switch in order to pr... |
H: Difference CPU, ASIP, DSP
During lecture CPU (Central Processing Unit), ASIP (Application-Specific Instruction set Processor) and DSP (Digital Signal Processor) were briefly mentioned.
Unfortunately the main differences (and use cases) weren't discussed.
In my understanding CPUs are the general purpose work horses... |
H: Does cutting the covering of subwoofer wire affect the sound quality?
I have Sony 5.1 channel sound system. There is some cut on covering of subwoofer wire. The copper wire is not affected at all. So, I am curious to know whether it will leak the passage of sound and hence, the sound quality will be affected or not... |
H: Using different UART pins on STM32 Nucleo
I am trying to use the STM32F103RB Nucleo board. I am learning how to do serial comms so started with the classic 'Hello world' printed to a serial monitor.
Eventually, I want to print data to the serial monitor, while receiving data via different UART pins. The Nucleo uses... |
H: Is this circuit correct?
I need to know if this circuit is efficient to transfer most of the current from several identical independent 2 phase dynamos. The converters are all the same and ideal for the voltages no problem with that.
Is this the correct way? Thanks!
AI: Simplest form of load balancing is to add a ... |
H: Does AC phase shift violate Ohms law?
Ok, so I am not new to electronics by any means, but I still can't grasp one key concept: AC voltage-current phase shift. I understand the math behind it, but I need someone to explain to me how it works at the fundamental level.
Let's take into consideration the circuit below.... |
H: How I can solve this circuit with diodes?
I tried to solve this circuit but without success.. Also is there any current flowing trough D3? and how this isn't short circuit?
AI: You know the Shockley diode equation:
$$I_\text{D}=I_\text{SAT}\left(e^{^\frac{V_\text{D}}{\eta\,V_T}}-1\right)$$
Since the emission coeffi... |
H: How to wire up a street light to change lights in specific states (digital circuit)
This is the final project for the only electronics course in my career. I have never taken any other electronics course and I'm seriously at a lost here. I need to score 100 here to pass the course.
I need to create a synchronous co... |
H: What is wrong with this complex circuit analysis?
I tried mesh analysis of this simple circuit but it is wrong, i can't figure out why though.
I simply applied KVL using the two mesh currents.
EDIT:
the phasor Ig is known so i make the obtained linear system in a system with Vx1 and I2 as unknowns.
Plugging in the ... |
H: Programmable polarity switch for DC circuit
My question concerns a future research project in electrocoagulation (water treatment) I am planning right now.
I will have a lab power supply connected to two (or more) plates in water. The operation will run in a galvanostatic mode, meaning I want to have a constant cu... |
H: How to establish communication between microcontroller on a bread board and laptop using usb cable?
I want to learn about microcontrollers and use them in some projects. But I do not want to buy an Arduino, although that is what would be easy for doing projects. This creates a problem in programming the microcontro... |
H: How does a number is saved in a register
I've tried looking online, but I still haven't quite figured it out - does a number, for example 0x100 saved in a register by some convention like little/big endian like thigs are saved in memory or maybe it is just casting every digit into 4 bytes from lsb to msb? e.g. if I... |
H: Controling linear PSU temperature
In many digital lab PSU designs, designers usually use a thermistor to control the cooling fan speed based on the main regulator actual temperature.
When we have both current and voltage values, is there a reason why they don't control the cooling fan speed based on how much power ... |
H: Cable wires - confirmation of live and ground
I bought a generic DC power extension cable and I'm trying to wire it to a connector with a cable attached. The connectors cable clearly has two wires - a red and black/+ and -. This is what I'm used to, coming from the world of breakout boards and tiny wires. The gener... |
H: What exactly is meant by beta dependence in this fixed bias BJT scheme?
What I understand that, in a fixed bias BJT scheme the problem is beta dependence.
Below is an example from a text:
Now I read that this is not a good design. But I will still solve this by assuming we have a constant unchanging beta:
So the a... |
H: Identify a fried capacitor
I am trying to clearly identify a fried ceramic capacitor in order to replace it. By chance, I could take a picture on another device of the same type:
So far what I found after some search:
I suppose that "101 K" is 100 pF +/- 10%.
SL2KV (or is it SL2KY?) might be: dielectric = SL, max... |
H: Changing Polygon clearnce in Altium
I need to change the polygon clearance. Here are my setting rules.
But it seems that the lower rule for all clearances is superior to the second one and nothing has been changed. what is my mistake that the first rule is superior?
AI: You can set the priorities of the rules, wi... |
H: Coupling capacitors in a CE amplifier
I know that those C2 and C3 are used to isolate DC from the input and output. Capacitors are always open to DC(w=0) and since the equivalent impedance of a capacitor can be expressed as 1/jwc in frequency domain, to get a low impedance(almost short circuit), I think to use a l... |
H: What makes LM386 so common at sound amplification
TL, DR at the end.
Preamble: This quesiton results from an analog electronics lab project. However, I am not someone who asks here and wants you to do the job for me. Rather, I have been extensively spending time for this and right now I feel I am stuck. So I wanted... |
H: What commands in assembly cast value from hexa to decimal when they are called?
how can I know if a command is treating an immediate as a decimal or as a hexadecimal? For e.g div casts the values into decimal before it makes the arithmetic division:
.data
x: .quad 0x16
y: .quad 0x7
z: .space 8
.text
.global main
m... |
H: Rubber insides and circuit transparent sheets of USB keyboard don't work outside of plastic case
I have very little knowledge of electronics and circuits, so I apologize in advance if the question is dumb. I couldn't find answer anywhere.
I am trying to remove plastic part of my keyboard and have it be only that wh... |
H: Does driving a speaker with a DC offset AC signal matter?
Do these two input signals have different effects on a speaker?
An AC signal with some value of DC offset.
Same AC signal but centered at 0 V.
AI: Yes.
Figure 1. Cutaway view of a dynamic loudspeaker for the bass register.
1. Magnet,
2. Voicecoil,
3.... |
H: Flash programming for a custom design with SAME70
How can I add flash programming capabilities to a custom-design board witg the SAME70 or SAMV71? For example, with the UC3-A3 (AVR32), I just expose TDI, TDO, TCK, TMS, RESET, GND/VDD, and voila: I connect a JTAG programmer and done. This option seems to be unavai... |
H: How to change the led on this board to a brighter led? 12v input
Needed to change these led to brighter led. Is it possible?
If yes then how can it be done?
Noobie!!
AI: Yes, it is almost certainly possible. I'm not sure exactly which part you are asking about.
One way of looking at it is that the brightness of t... |
H: What does that statement exactly mean? ( about dB )
When you separate the collected signals, each car’s channel must
attenuate the other cars’ signals at least by 20 dB.
A speaker will be able to generate a sound which contains 3 different frequency values of sine waves. And also the amplitudes of the sine wave... |
H: PCB Layer Stack Dielectric Constant Math
I have a question reference PCB layer stack and the adding multiple dielectric constants together.
The image and description below should help clarify the question:
The differential pair will be configured in an Edge Coupled External on the top layer, with the signal groun... |
H: How to calculate RMS power of an offset sine wave
I know when it is centered at 0, Vpeak/sqrt(2) gives the RMS.
When I do FFT on LTspice, it gives a peak at -17dB which is equal to 0.141254
On the FFT page, program says that it shows RMS values. But, I don't think the RMS of this wave is 0.14 W. You are also welc... |
H: Attach output to a state in Finite State Machine in VHDL
In my digital electronics class we are currently dealing with Finite-State-Machines and VHDL.
I have written a VHDL-code for finite state machine and I've run into trouble. I want to attach the output to my state, but I don't know how to do it.
For example, I... |
H: Which are the physical factors that determine the maximum transportable resolution of a cable (for instance: HDMI)?
Which are the physical and electrical factors that determine that an old generation HDMI can transport for instance 1080p resolution, while a new HDMI (2.0) arrives at 4k?
Is it due to a different at... |
H: Phase Lead and phase Lag
I find the concept of phase lag and and lead quite confusing.
Suppose we have two voltages
\$V(\theta) = V_{max} \cdot \sin(\theta + 30^o)\$
and
\$V(\theta) = V_{max} \cdot \sin(\theta + 60^o)\$
If frequency and maximum voltages are same
then according to the definition
"The leading alte... |
H: Pads reflecting in controlled impedance strip?
Background
I'm designing a controlled impedance line for a 1900MHz signal travelling between SIM7000A cellular chip and an antenna.
Question
Tuning circuits are recommended for antennas with series and shunt passives to correct their impedance to 50 ohms by using a Smi... |
H: Considering the power dissipation of a transistor
These two waveforms are the power dissipation vs time graphs on two bjts (npn and pnp). I got these using LTspice ( alt + right click on the bjts ).
The thing is, while considering will my transistors be able to dissipate those powers without burning themselves, wh... |
H: Detecting short circuit (max4080)
I'm using Max4080 to measure the current:
simulate this circuit – Schematic created using CircuitLab
The problem is it can't detect short circuit because when RS- is connected to ground, Rsense will be at low-side. Max4080 is a high-side current measurement chip...
Is there anyw... |
H: Balanced impedance CM and DM stages EMI Filtering
Here is the following assertion :
I would like to understand why line impedance imbalance can cause CM noise to get converted into DM noise ?
Thank you very much !
AI: Think of a DC voltage source with two equal resistors R1 and R2 connected at its + and - Termina... |
H: STM8L151 UART software
I am new in STM programming and I want to do a simple UART communication but I don't know where to start.Can somebody send a tutorial for stm8l or a full code would be better so I can examine it.
Thx.
Schematics :
AI: I am not familiar with STM8, but with STM32 there is STM32CubeMX, where yo... |
H: Confusing regarding sub domains of main specializations EE?
I want to apply for masters program in Hungary in EE
As shown attached snapshot, there are listed 3 secondary specializations:
Smart city
Smart systems integration
Optical Communication
I know that subject number 3 (Optical Communication) is secondary ... |
H: KiCad Simulation VSOURCE Triangle waveform
I want to simulate a second order active low-pass filter in KiCad, using the internal spice-based simulation tool. The input signal must be a triangle waveform of 30kHz and 0,5 V peak to peak, and the problem is I can't find any tutorial, on how to create a triangle wavefo... |
H: Can I charge a lipo battery using piezoeletric energy harvesting?
I use a 9V 800mAh lipo Okcell battery to power my ESP8266 ESP-01 with a voltage regulator to change it to 3.3V. I use the ESP to detect the voltage peak from a piezoelectric when someone is running to measure the force and determine the time someone ... |
H: Computation of the Scattering Matrix of a Transmission Line
let's consider this transmission line (with losses) in which a and b denote respectively the reflected and the incident waves at each port:
This exercise asks to find its scattering parameters normalized with respect to an arbitrary impedance Zc1, which i... |
H: LTspice a voltage source as a function of time
I saw the ability to control R by time in someone's drawing, tried it, and it worked fine. Then, I thought that I could use that "time" keyword also to control the voltage of a DC source. However it didn't work. It gives an error:
Error on line 2 : vcc n001 0 time*2
... |
H: Correct Polarization of Common Source Amplifiers
I was reading a book about amplifiers and I have read the following sentence about the following picture:
The idea-guide is that we must access simultaneously to the Gate terminal and to the Source terminal of a transistor so that we can command it to produce a con... |
H: Is this DIN connector suited for MIDI devices?
I'm having difficulties to find PCB mount "MIDI" connectors by a supplier like Farnell, no search with the keyword "MIDI" succeeds. I know a MIDI connector is a DIN5 connector, but there seems to be many variations of "DIN5".
For example, do you think that a product li... |
H: Capacitor Maximum Frequency of Operation
The correct answer is 760kHz.
My Solution is:
First find self-resonant capacitor frequency.
Self-Resonant Frequency = 1/(2pi*sqrt(LC)) = 758kHz.
From our second condition, we have that the capacitor must be operated less tahn 75.8kHz.
Capacitor Impedance 1/(2*pifC) > 10r, ... |
H: Computer power supplies usually have higher efficiency on 230V than on 115V. Why?
As seen here in the example, this particular power supply (and most others too) has higher efficiency when running on 230V. Given that computer power supplies are usually required to output a combination of 12V, 5V, and 3.3V DC, why ... |
H: How can I estimate the minimum beta for this driver to work in hard saturation?
Imagine I build the below LED driver circuit where I know all the component parameters such as 2V LED forward drop and resistors and Vcc and Vbb as in the following diagram:
And if I only dont know the beta of the NPN transistor; how c... |
H: Voltage across tape recorders
Here there's a question that I'd like to double check with you lot.
According to an article on impedance, the voltage across each of the tape recorders in the image is divided by two. Is that so?
Thanks for your time!
AI: The author of that article seems to be confused. The caption say... |
H: STM32F0 SPI--what am I missing?
I'm trying to send SPI data to a MAX7219 from an STM32F042 (the protocol is one-way without MISO). I must be missing something very obvious. With the code below, the only visible side effect is the GPIO nCS line wiggling. Neither clock nor MOSI show any activity.
What am I missing?
... |
H: Improving the classic 18V mod for guitars
I am trying to figure out how to use a potentiometer or some form of fader to bring my circuit from 9 V to 18 V, and then back to 9 V without it being permanently one or the other, having to disassemble to change.
I don't want popping from an DPDT switch.
I'm wanting to be... |
H: How does a CAN transceiver work?
CAN Transceiver Transmit Mode
I try to understand the transmit functionality of a CAN transceiver. I found this post a good starting point, but it doesn't completely answer my question.
Block Diagram
Let's say we have the following CAN transceiver block diagram (VDD = 5 V / VSS = GN... |
H: Does a program exist to draw logic signal waveform from csv data?
Assuming that I want to collect several seconds of activity of digital signal on multiple pins of a device, one way is to create a simple FPGA design that buffers all that information and then transmits it to the PC or stores it into a file (csv form... |
H: LED current source safety margin
I have a power LED that requires 600mA at around 25 Volts. Since there are mainly 24 Volts and 36 Volts power supplies available on the market for a reasonable price, I needed to choose a 36 Volts model, because otherwise (at 24 Volts) the LED would be undervolted and probably draw ... |
H: NCP1117 Regulator voltage feedback not working correctly
I'm having a brain fart. Reading 3.1V ish on the output. My +5V0 net is after a schottky diode with 5V + a little bit coming from the NCP1117, and another 5V0 coming from a USB connector. Reason being I want the regulated voltage after the diode to be 5V, acc... |
H: CE amplifier non-sinusoidal signals
I am trying to learn some transistor amplification by simulating. However there is something I don't understand why.
Why all waveforms are somehow distorted or bad-looking sinusoidal-ish waves instead of nice sine waves? Only the Vbase waveform looks decent.
AI: A very short an... |
H: Finding current in RLC circuit
I am given the following circuit:
Thanks for any help.
AI: Assuming you want the current through the horizontal R0, you can,
Combine all the other passive devices using series and parallel combinations. Since you have two source frequencies, you'd do this calculation separately for e... |
H: Assign existing footprint to existing component in Circuit Maker?
I found the following two components in Circuit Studio that I am using in my design:
AOD407:
And IRLR8726:
The manufacturer recommended footprint is exactly the same for both, and they use the same 3D model in Altium. The trouble is, whoever did th... |
H: HX711 module VCC and no VDD
(Image source and more details: circuitio.io)
I am trying to build the above circuit powered by battery alone. Sparkfun HX711 is expensive and hence I am using HX711 bought on Amazon. Here is the documentation
HX711 module has Operating Voltage: 2.7V to 5VDC and Operating current: <10 m... |
H: Need help to design efficient zero crossing CURRENT detector : clamp diode solution
I try to design a replacement potter's wheel motor controller for an old potter wheel. I have solve my zero crossing voltage detector and TRIAC command.
Now I begin to understand the importance of the phase shift between current and... |
H: How to determine LVDT sensitivity?
I performed an experiment using an LVDT where I used a generator voltage of 4.84V. I determined the secondary voltage at the beginning position, obtaining 2.48V and at the end (displacement os 22.5 cm) 2.12V.
Now I have to compute the sensitivity in mV/V/mm.
I thought that this ... |
H: Does adding the input signals change the behaviour of an amplifier?
I have these 3 signals, they differ by 300 Hz each. When I use any of these signals as input to a class B amplifier, I get the desired current amplification. The thing is, I have to input all these 3 signals at the same time to the speaker(my load... |
H: I swapped +5V and ground on a chip, how to know if the chip is dead?
Well, I accidentally connected ground to the +5V pin and vice-versa on a (W65C22), I don't know how to be sure that I didn't burn the chip.
One thing I was noticing is that when the cables were swapped, when I connected power not even an LED conne... |
H: Current sharing parallel power supplies
Recently, I purchased two 48v 25A power supplies. I want to put them both in parallel. In reality, each PSU consists of 2 smaller individual units(see picture), so 4 units in total. Pin 8 of that ribbon wire connector is the pins you need to connect in order for the two small... |
H: Is my understanding of output impedance for this transistor circuit correct?
Im having trouble to understand the meaning of output impedance of an active circuit and in this case the emitter follower. I have read several information but yet failed to get the meaning. Im looking for an easy but correct definition.
... |
H: How to design a switched mode battery discharger
I have a very basic understanding of switched mode power supplies and know that this is a simple buck converter suitable to e.g. charge a 12 V car battery from an input of, say, 24 V, with a dc current that may have some ripple:
The voltage on the battery resp. the ... |
H: Combinational loop in Verilog/SystemVerilog
What's the difference between a += 1 and a = a+1 in Verilog?
always_comb begin
a = '0;
a += 1;
end
always_comb begin
a= '0;
a = a+1;
end
Is the 2nd case a combinational loop?
AI: a+=1 is just a short-hand for a=a+1. They both are equivalent.
There is no combinationa... |
H: Voltage levels of Microcontroller Oscillator Pins
I am using MPC5606S Microcontroller.
I want to clear one concept and have a doubt.
The Microcontroller using 8MHz crystal on the pins 27 (XTAL) and 29 (EXTAL) And a 32.768kHz RTC crystal between pins 71 (XTAL32) and 72 (EXTAL32).
My understanding :
The Crystal is co... |
H: Why do sidebands appear after Amplitude Modulation?
In amplitude modulation, the amplitude of the carrier wave is changed according to the variations in the message signal, and that's what we draw inside the two envelops of the message signal, that's totally fine, but what is confusing to me, that we never changed ... |
H: Strategy against Side Channel Attack
I am newbie to Hardware Security. While studying Side Channel Attack, I realized that power consumption profile of electronic control unit is a key to encrypt what algorithm runs on it. I thought implementing same algorithm with different approach may change power consumption p... |
H: Pig tail vs SMA pcb mount connector
Is there any difference in applying a 50-ohm female SMA PCB mount connector to an antenna as opposed to a pig-tail connector to a microstrip patch antenna?
The difference is in terms of the performance of the antenna, such as the resonant frequency shifting, BW, gain, axial ratio... |
H: What is boot line in BSP
On the wikipedia page Board support package it mentions the term "boot line". What is the meaning of "boot line"?
AI: If you run a program from a command prompt on a desktop operating system, you can add extra command line parameters after the name of the program. This provides a mechanism... |
H: BLDC/BLAC controller motor voltage reverse protection
I am currently designing a BLDC controller and keep running into a power safety issue:
I have added a smart diode reverse protection controller to my design with its transistor between the fuse and the bulk capacitance (4 x 220uF elcap bank).
This was done to pr... |
H: Rejection of particular frequency in a signal which contains many frequencies in its spectrum (fourier transform)
How does a filter know which frequency is to reject?
Detail:
A signal may contain a lot of frequencies. How could we surely say that the result of linear combination of the result of applying these fr... |
H: PINOUT ON LT1789CS8-1
the following in-amp IC is 8-lead plastic SO, but there is no indication about which pin is first pin (oreintation is not printed on the IC ) any information about how to determine it is good enough.
Picture:
AI: The LT1789 datasheet (page 22) clearly shows that pin 1 is on the chamfered side: |
H: How can I turn a midi keyboard to a stand-alone piano using Arduino or any other way?
I have a midi keyboard, but I find it frustrating to start PC, DAW system every time I want to play.
Is there a way to use Arduino to create an on the go stand alone piano. (It should work like a digital piano). Just switch on an... |
H: VHDL using 'if' to compare a 'variable'
Using Xilinx, I need to compare a 'variable' called 'row', defined as:
variable row : std_logic_vector(2 * n - 1 downto 0);
This line was given to me, now I need an if statement that will execute if row is = 1.
I have tried:
if (row = "1") then
but the IDE warns me that ... |
H: Can we reduce power consumption of digital interfaces by using high impedance transmission lines?
Transmission lines must be terminated with the same impedance as the transmission line has itself to get an impedance matching and avoid reflections at a high impedance end point. This termination resistance closes the... |
H: Wiring Nest Thermostat E Heatlink in place of original Thermostat
I have a Nest Thermostat E, which requires me to replace my thermostat with the Nest Heatlink.
Google provides step by step instructions on how to do this using a series of questions and answers. However, I'm struggling with a lack of knowledge.
Doe... |
H: Syntax and/or best practice for buffering a vector in Verilog or VHDL
I have a Verilog block (Block A) that samples a serial signal with a relatively slow clock and then puts data in several registers based on the contents of the serial data.
Ultimately, these data need to go into several AXI slave register, since ... |
H: Is EMC shielding of a grounding wire required?
Consider the following 2 use cases:
Fully electric vehicle with 2 different insulated voltage systems: 1 high voltage @1000V DC insulated from chassis and 24VDC system with minus pole (-) at chassis. Would PE cable (connected to chassis) need to be shielded? If yes, t... |
H: What do you do to help you grasp a concept or understand something you're seeing for the very first time?
Often in industry you come across a lot of different devices or even concepts you're seeing/hearing for the very first time. Things like encoders, resolvers, PID, pressure transmitters etc.
I would like to kno... |
H: How can there be a current without a voltage?
Recently while trying to understand inductive AC circuits better, I got very confused with a question.
Let's suppose we have a purely inductive AC circuit with ideal wires and a switch. Let's also suppose that whenever we close the switch of our AC circuit, at time \$t... |
H: LTspice, plotting a node voltage problem
Edit: The question is answered in a such way that I am happy now, however for the interested ones, the mystery of the question is still on.
These two are the parts from my circuit, related to the question.
Now, I want to be able to plot V(pnp_c), however it does not allow... |
H: Explanation for Method of Monitoring Current from a Power Supply
I recently came across an interesting way to monitor current, but was not certain exactly how it works. Likewise, I was hoping that someone might be able to explain how the device measures current.
The object shown in green is a High Voltage Electros... |
H: Will swapping the input terminals on my op amp give me a negative reference voltage?
I am using an AD8031 op amp which outputs a 1.6V reference voltage with the circuit in the picture. I am powering it using 3.3V. I thought the output would be negative since the feedback is negative.
How can I get a negative volta... |
H: Allowable current in Ni-Cr 80 20 gauge wire?
I am creating a small oven for curing composites out-of-autoclave, and have some Ni-Cr 80 20gauge wire lying around. I need to put up to 8.6 amps through the wire at maximum. The current is controlled with a PID bang-bang controller, so the duty cycle is not 100% at th... |
H: Name of connector that connects wires to washer drain pump
I was sent here from https://diy.stackexchange.com/ as they said connector identification is quite common here.
I'm looking to replace a connector that connects to my washers' drain pump.
I first suspected the drain pump to have gone bad, but it looks like ... |
H: How to design a transimpedance amplifier that can adjust to large voltage swings?
I am making a photodiode sensor based on one show in the image below which I got from this research article. The problem I run into with my photodiode sensor is that variations in sunlight create amplitude swings that are too large. T... |
H: Microcontroller Always ON domain
I have a question about the MPC5606S Microcontroller.
I have very minimal software knowledge and only want to understand in hardware perspective.
On page 68 of the MCU datasheet, we have a block diagram which mentioned PD0 Always ON domain.
But in this Reference Manual of the MCU, o... |
H: What type of pin in this (see picture)? I see them in FSRs but they don't appear to be Dupont connectors
Here are the images of the pins:
And here is the FSR that it came from:
AI: They appear to be some form of pins used in clincher connectors |
H: What is RS-485 and MODBUS?
I understand the title seems too broad but it's a bit specific and I'm totally new to the communication stuff, so please bare with me. If the question is too broad, please provide some suitable links that I can look upon.
Now I'm given a simulator pyModSlave and a USB driver, that has tw... |
H: I want maximum 5V output from an Op-Amp. Is it a good idea to use a supply voltage for the Op-Amp of more than 5V?
I have the following circuit.
An Op-Amp (currently TLC2272CP) as a buffer (voltage follower). The non-inverted input of the op-amp comes from a DAC (MCP4922). I measure with an ADC (MCP3202) the input ... |
H: Resistor ratings for inductor fly-back suppression
I am building a circuit for user to interface with relays, and I am trying to build a protection to the circuit against fly-back from the inductor coil of the relay. Since there is no specific relay it is quite hard to choose the parts. All that is certain is the r... |
H: Is shared ground necessary?
I ask this mainly for curiosity and am not trying to make shortcuts for real projects.
I have a couple of devices (mcu development boards) that connect to each other using various communication busses. One of which is UART.
For normal situations, you need a common ground as reference as ... |
H: USB usage restrictions
I find it quite hard to find any information on how to deal with legal issues concerning the use of USB online. I mainly have two question I cannot seem to find a definitive answer to.
Is it required by law (US or any other country) to have a VID/PID combination that is registered with the U... |
H: A really basic question about ammeters and their ranges
I was performing a basic verification of Ohm's law in a DC circuit experiment the other day, during my exams and I mistakenly used an ammeter with range 0-10A instead of the 0-1A ammeter that the practical manual expects us to use.
The invigilator/examiner not... |
H: Calculation of Relay current
I am using Relay OJE series SPST and I want to drive the relay with V=5v and the resistance through the coil is 125 ohm. From microcontroller 3.3v and 1k resistor. The NPN type is BC817-25 and the max hfe/B is 400.
What is Ib, Ic? And how much current goes through the coil? To make sure... |
H: LED driver: how to choose current and voltage?
In my project I have a microcontroller which has to light 3 groups of LED. Group A has 3 LED, Group B has 2 LED, Group C has 1 LED. There are all the same LED. In each group the LED are in series.
Let's consider group A :
VCC is obtained from a positive voltage regul... |
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