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Low-end MCU development board von Neumann [closed]

I am learning assembly language programming with an ATmega328p (Arduino Nano). Unfortunately, due to the Harvard architecture, I cannot execute code from the SRAM, which is important for my current ...
user380637's user avatar
0 votes
1 answer
24 views

Understanding dBm value of FFT measurements

I am getting familiar with the FFT functionality of my oscilloscope. I am using a Siglent SDS2204X Plus that has been firmware upgraded to 350MHz. Testing of the FFT function involves the use of a ...
mike's user avatar
  • 127
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0 answers
16 views

Is there any way to speed up simulation in Ltspice?

The following is my FM transmitter circuit. It take ages to simulate. In real life, I want to use this BFQ19SH6327XTSA1 from Infineon instead of 2N22222. (link datasheet) and download link for lib <...
kile's user avatar
  • 881
0 votes
0 answers
6 views

ADC DNL INL Confusion

The DNL of an ADC is defined as the measured code width versus the ideal LSB code width. The INL is the integral of the DNL (or the running sum of it) But the INL has two methods - end point and best ...
AlfroJang80's user avatar
  • 3,125
0 votes
1 answer
24 views

A basic question about using dielectric material in PCB boards in relation to electric field

I was wondering what the PCB's dielectric material(such as FR-4) do to the electric field. If I'm not wrong, the dielectric material influences how the electric field lines are distributed. And it ...
GNZ's user avatar
  • 1,781
1 vote
1 answer
33 views

Do audio impedance mismatches cause reflection (ie, 8-Ohm output to 20kOhm input) ? Does it matter?

I understand that audio source⇒input impedance mismatches are normal, and this answer provides a good reason as to why. However, having worked with RF more than audio, mismatches cause reflection that ...
KJ7LNW's user avatar
  • 2,012
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0 answers
16 views

How do PCB trace width calculators find the coefficients from the IPC-2221?

PCB trace width calculators like this one and many others like it always quote at the bottom something like this, For IPC-2221 internal layers: k = 0.024, b = 0.44, c = 0.725 For IPC-2221 external ...
verpas's user avatar
  • 31
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0 answers
12 views

Usage of two PSU in parallel for WiFi router using Shchottky diodes

I have WiFi router which is powered by AC adapter with nominal output 9V 0.6 A. Due to power outages I have bought USB DC-DC adapter 5V->9V and power it from power bank/power station. Router power ...
1n5817's user avatar
  • 1
-1 votes
1 answer
19 views

Beat frequency - Square signal

This question comes from this one, LTspice - Beat frequency : It appears that when I did a FFT of two sinusoidal signals, there was no what is called beat frequency. When I do the same exercice with ...
Jess's user avatar
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1 answer
42 views

What is wrong in this schematic?

Im working on a PCB for a nanogrid basically i gotta monitor the current/voltage of the renewable energy sources and the battery storage (SoC) and the load state, also transfer all this information to ...
Knowledge Seeker's user avatar
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1 answer
33 views

Why my RC-oscillator design does not produce any output?

I designed this single transistor RC-oscillator circuit and implemented it on the breadboard. However, I detect no oscillations on the output. I know that using power transistor is not the best idea ...
ScienceDiscoverer's user avatar
1 vote
1 answer
27 views

MICRF112: loop vs monopole antenna

I'm designing a PCB that trasmit over 433 MHz with MICRF112. The datasheet says that the device works with monopole or loop antennas. I decided to go with a monopole antenna. This is the example ...
ocirocir's user avatar
  • 133
-1 votes
0 answers
57 views

Controls - seeing if a discrete time system can arrive from a certain input to a certain output

Given a system: $$A = \begin{pmatrix} 7 & -3 \\ 18 & -8 \end{pmatrix} \quad B = \begin{pmatrix} -2 \\-6\end{pmatrix} \quad C = \begin{pmatrix}1 & 0 \end{pmatrix} \quad D =0$$ I need to see ...
Piratemetaldrinkingcrew's user avatar
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0 answers
27 views

Weird FSM behavior on the start only

I am a vhdl beginner working on this entity that goes through 256 12bits inputs alternating with even index inputs in "a_s" and odd ones in "b_s" and this 16 inputs at a time (8 in ...
Anis Bensidhoum's user avatar
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0 answers
21 views

ESP-8266 doesn't boot on particular power supply

I have an ESP-01 board (small board with ESP-8266) that usually works fine, but with one particular power supply, the LED just flashes rapidly and the module doesn't start. I know that these modules ...
Lukor's user avatar
  • 101
-1 votes
0 answers
34 views

Gain depending to Frequency

This script sets up a server that listens for incoming connections. It reads audio data from the client in chunks of 1024 bytes, processes it using FFT (Fast Fourier Transform) with frequency-...
Phaze Music's user avatar
1 vote
0 answers
18 views

Soil Moisture Sensor ADC value is inaccurate

I am planning on making a soil moisture sensor with a capacitive sensor, Thonny ide, micropython, and a raspberry pi pico w, and I followed some online tutorials as I am relatively new to the world of ...
user390652's user avatar
0 votes
3 answers
62 views

I am analyzing this circuit using KVL

I am analysing this circuit using KVL. My doubt is while writing the loop equation what will be correct format. $$ 70-V_x - 2V_x- V_o =0 \: \: \: \text{or} \: \: \: 70-V_x-2V_x + V_o = 0$$ Please ...
Bhavesh Panwar's user avatar
2 votes
0 answers
37 views

DC motor stalling resets Arduino - A good thing?

I have a small DC motor that used to draw from a 3.7 V lithium battery in a small Chinese made device. I did away with the PCB to use an Arduino UNO with my own programs. I tried using motor shields, ...
Danny Akuma's user avatar
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0 answers
24 views

How is slope compensation implemented in the UC3843?

I was reading about slope compensation in the datasheet of UC3843 and I have watched this tutorial on youtube which gave me a general idea and overview about what slope compensation is. Now regarding ...
AbdAllah Talaat's user avatar
2 votes
0 answers
41 views

Calculation of transformer inductance value

I am trying to find a way to calculate the primary and secondary inductance of transformer. I learned that it is changing from one topology to another. My topology is Phase-Shifted Full-Bridge ...
Mhan's user avatar
  • 355
1 vote
1 answer
28 views

Does sealing low voltage high current fuse box from air exchange affect the current where the fuse blows?

I have a (Victron Energy) low voltage high current fuse box, which is intended for mega fuses such as 80A, 100A, 125A. Unfortunately, the fuse box has quite large holes where the thick cables go in, ...
juhist's user avatar
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1 vote
2 answers
49 views

How to send large quantities of data via HID

I'm making a 100% customisable mouse, that can be programmed from an app. You program it in a node based language similar to the Unreal Engine 5 interface Your code is encoded to binary, and sent to ...
YANNTASTIC5915's user avatar
0 votes
1 answer
19 views

IAR how to get the value of environment args

I would like to know what is the easiest way to get the value from the IAR's environment args such as $TOOLKIT_DIR$ or $PROJ_DIR$. I know what method uses Windows for it's environment variables, but I ...
GenGen's user avatar
  • 49
0 votes
0 answers
10 views

How to conduct temperature variant EM simulations in HFSS?

I want to conduct temperature variant EM simulations in HFSS i.e. simulate s parameters of a CPW at various temperatures. I am using a temperature variant material using thermal modifiers. I have also ...
Curious Cosmopolitan's user avatar
1 vote
3 answers
65 views

Transient analysis of first order circuit

For the attached problem, I am getting the signs wrong.Here I have considered the inductor voltage signs as such because after closing the switch, less current would flow through the inductor but ...
lefty's user avatar
  • 13
0 votes
1 answer
19 views

Altium ver-24. Can not move/drag a footprint close to the board

Altium version 24: I have a completed schematic and imported PCB and I am doing components placement. Everything looked good until a heatsink was added. I added a heatsink symbol(HS1) to the schematic ...
Spark's user avatar
  • 41
0 votes
1 answer
52 views

Can we catch signals from a cellphone using an external device? [closed]

What if someone stole em waves from our mobile devices to listen to our conversations or get our OTP. Whatever encryptions they have they are just EM waves innit and they cannot be propagated only in ...
Newtron Malayalam's user avatar
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0 answers
40 views

Is it dangerous to have no cover on a fluorescent tube (bathroom light)? [closed]

Is it dangerous to have no cover on a fluorescent tube (bathroom light)? I have a bathroom light above my sink with two fluorescent tubes. The acrylic cover sheet that slots into the fixture is "...
Jocelyn Yeoman's user avatar
0 votes
2 answers
40 views

capacitive filtering of power line transients without power loss

I've been researching so-called "surge capacitors", which are claimed to augment surge protection devices (SPDs). The claim is that SPDs usually have at least a 5-10 ns response time, and ...
Special Sauce's user avatar
0 votes
0 answers
11 views

How can I switch between battery tracking mode and input voltage regulation mode on the BQ24210?

I'm trying to create a circuit in which a BQ24210 automatically switches between charging a battery via battery tracking mode and charging it via input voltage regulation mode. This is done by having ...
gins123's user avatar
0 votes
1 answer
36 views

Can I mix 5v power sources? how about 24v power sources?

Hello and thank you in advance for pointing me in the right direction. I finally started designing my own PCBs. If I set up a PCB with a 110 to 5v power source (HLK-PM01), could I then add another 5v ...
Cancun Manny's user avatar
0 votes
0 answers
27 views

Controlling a device in a car using a button and ignition

I need to connect a device to my car. I thought about using an XOR gate because: A - button B - car ignition. If the car's ignition is off (0), pressing the button (1) will turn on the device (1). If ...
jminhal's user avatar
  • 21
0 votes
1 answer
30 views

Why don't LED datasheets specify a maximum rated voltage?

I understand that (i) LED's have forward voltage drops (Vf) and (ii) that exceeding the dissipation wattage or max current can damage the device; thus one uses a series resistor to limit the current. ...
KJ7LNW's user avatar
  • 2,012
0 votes
0 answers
25 views

HS-6268-V1.2 Schematics [closed]

1: I have a soldering iron and hot air controller board. It comes from an SMD soldering rework station by the same name. Mine is unbranded, but I have seen about half a dozen sellers selling the same ...
HAL 9000's user avatar
0 votes
0 answers
24 views

Using a Latching Button for Car Hazard Lights with LED Indicator

I'm attempting to learn more about electronics with this small project I am using a latching button . I connected the button to the ignition wire of the car because I want the LED to stay on. My ...
jminhal's user avatar
  • 21
0 votes
2 answers
47 views

Why does 9.7Vrms == 27 Vpp? I thought it was 9.7/0.707 == 13.72!

At first, I thought this calculator was wrong, because I have always used an RMS to peak-to-peak conversion as \$ V_{RMS} = \frac{V_{pp}\sqrt{2}}{2}\$: https://benchmarkmedia.com/blogs/calculators/...
KJ7LNW's user avatar
  • 2,012
1 vote
0 answers
28 views

Maximizing magnitude of fields created by an antenna

I have a small loop antenna (\$C\$ = circumference<< \$\lambda\$ ). I am interested in the fields created by this loop at a distance \$D\$ along the z axis also small compared to \$\lambda\$. I ...
DarkBulle's user avatar
  • 395
0 votes
0 answers
24 views

Choosing a power supply for making a Hasel Actuator [closed]

I'm planning to build a HASEL actuator and need to buy a power supply. There are many options out there, and some are quite expensive. I've found a few affordable ones and was hoping you could help me ...
forasle's user avatar
0 votes
1 answer
30 views

STM32G4x 2 chanel Contunious Conversion Mode ADC DMA voltage read problem

I am using STM32G431KB Nucleo for measure a potentiometer voltage via ADC1_IN1 and ADC1_IN2 channels with Scan Mode DMA. And my samples arrays are always zero, no change. I share my code below. What ...
MSB's user avatar
  • 77
0 votes
0 answers
22 views

STM8S003 TIM1 prescaler seemingly not affecting anything

I'm trying to use an STM8S003 chip for a pretty basic function, so I'm standing up the TIM1 peripheral to use output compare. Everything seems to be functioning correctly, except that the pre-scaler ...
InBedded16's user avatar
0 votes
2 answers
49 views

Do dimmers affect consumption?

I'm almost hesitant to ask this question because it just seems like I'm going to get lambasted with the obvious but I truly do not know the answer. This is a two prong (no pun intended) question. If I ...
Paul Sebesta's user avatar
0 votes
2 answers
112 views

Why do birds not fluff up when they land on super grid transmission lines?

I’ve been testing a home brew Van de Graaff generator on my younger sister. When I do that, her long hair fluffs up like that scene in the Pink Panther cartoons when he’s tumble dried. Puff! Birds, ...
Paul Uszak's user avatar
  • 7,547
0 votes
0 answers
48 views

Acceptable resistance between hot (mains) and ground (earth)?

A DIY project I'm working on uses electronics embedded in concrete, including 110V AC heating elements. As I was verifying my wiring before testing the device I was surprised to discover conductivity ...
sirbrialliance's user avatar
0 votes
3 answers
36 views

Esp32 controls a 12v coil relay through PC817 and 2N7000

I need to control a 12v relay with an Arduino nano ESP32. Can somebody check if the circuit I designed is good? Components list: MOSFET: 2N7000 (N-channel); Optocoupler: PC817; Diode: 1N4007; Relay: ...
PaoloRos's user avatar
0 votes
2 answers
41 views

Are variable capacitors compatible with breadboards still available?

Variable capacitors are used less, since the preference is for digital adjustment. And through hole parts are used for less, since the preference is for SMD. Finally, many variable capacitors have ...
SRobertJames's user avatar
  • 1,120
2 votes
1 answer
75 views

Howland-based multi-range current source, has this configuration been published anywhere?

While playing around with the Howland current source in a simulator, I produced a simple multi-range configuration I've not seen published before, and haven't been able to find with an (albeit brief) ...
Neil_UK's user avatar
  • 169k
0 votes
0 answers
39 views

I2C: SDA and SCL Lines Pausing Between GND and VDD

I'm seeing communications on an I2C bus are momentarily pausing between GND and VDD (3.3V) during some transactions. See scope shot of the SDA line below: Since it stops at about 800mV, this is below ...
oneil's user avatar
  • 53
0 votes
5 answers
99 views

Why, when conductors are connected in series, their current strength is equal?

Why, when conductors are connected in series, their current strength is equal, because the resistivity of the conductors can be different?
Vladislav Butko's user avatar
1 vote
2 answers
101 views

Will this FM transmitter work?

I found this schematic on circuit digest. I have tried to simulate it in LTspice. That's the wave I got from the simulation. Most of time it's just DC and does not oscillate at all. Is this going to ...
kile's user avatar
  • 881

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