#help

Hello, I have a 2014 Aprilia RSV4 with 1 black user key, I did not know they had PIN codes when I bought her. Anywho, after a week of fun riding the bike went into limp mode and is now demanding "Insert the code" everytime I start her up. I am the 4th owner, the 3rd is the shop that sold her to...

Hi everyone! I’ve been working on a microcontroller-based project that was rock solid on a breadboard,, but I’ve hit a bit of a mystery after moving the design to a custom PCB. While the jumper-wire prototype felt very stable, the PCB version is behaving unpredictably—specifically during...

A fatal error occurred: Could not open COM4, the port is busy or doesn't exist. (could not open port 'COM4': PermissionError(13, 'Access is denied.', None, 5))

I was assigned to choose an existing project and design a custom PCB for it. My project involves LEDs arranged in a circle that light up sequentially, while the LED in the center is supposed to stay on continuously. After soldering everything together, the circuit didn’t work. When I measured...

Ok, so I want to mess around with LEDs and Arduinos, but have been spending the past mnoths pulling my hair out of my head, looking for a resistor with random resistance. Not like a degree of error with resistance, I mean like peaks and troughs, either getting close to overvolting the LED, to...

I have to simulate this schematic in LTspice. The problem is, that it uses an CMOS 4017N counter. I've only found one libary which has that element, but it has different inputs. The main problem i have, is that i dont have the VDD input. On the first picture is my project, and on the second one...

Hi, I'm a physics student, and I have a small problem for a lab that I have to solve. Here is my problem: I must create a circuit which uses capacitors to gradually close a light, but in addition, we must pass the current from the capacitor which discharges by the base of an NPN transistor. A...

I hope you are doing well. I'm a high school student and am in the process of designing a simple PCB through KiCad for a project I'm working on. This is my first time dipping my toes in any sort of electrical engineering so although the countless tutorials I watched helped me get started I'm a...

hello, i had a 9 inch monitor my car and after long time i open it and i want to use it's TFT display, i don't know how to use it but i know something: 1. it has 50 flat and one board on it, that merge the 50 flat from display and 10 flat from controller and send it to main board with 50 flat...

Hey there I'm currently working on project named metal detector circuit on Proteus there is no waveform showing on Proteus even there is no mistake in circuit can anybody help me in this regard.

Moderator note: English is the language of AAC. As a courtesy to a new member, a translation has been added to this post. In the future please use English for posts. Google translate or similar services are acceptable. TRANSLATION: 0-30 VDC STABILIZED POWER SUPPLY WITH POWER CONTROL 0.002-3...

I have a model kit that comes with an LED kit and it has a 5 minute timer for the LEDs to stay on, then it'll turn off. I want to remove that timer so that the LEDs stay on indefinitely until i cut off the power or press the button to switch to a different lighting mode.

Hey guys, I am trying to diagnose what the issue is with my Kurzweil CUP2 digital Piano The piano displays no sign of life besides a red on led. LCD screen does not display anything Buttons do not seem to do anything(there is a little red light above each button that indicates the "mode" it is...

Hey guys, I am relatively new to micro electronics, and am in desperate need of help! I want to bypass the muting circuit in a electronic piano. This involves either activating the relay, or pulling it to ground (BA3-5 Relay, and the highlighted LS1 in the picture below). Please could someone...

I am designing a circuit SAR ADC in ltspice. I've been facing this error and I've tried many tricks but I can't find the solution. I assume that the simulator does not find an initial point of operation. Ιn the circuit use the following components : 1) LF398 2) LM393 3) 74HCT273 4) 74HCT74 5)...

Hello everyone and greetings. I have got my hands on this massage chair that has all it's functions working all right except for the up down mechanism. As soon as it is started the main assembly moves up and hits the upper limit switch but the drive motor does not stop and starts to vibrating...

I have watched recently this video: At the end of it he describe a way to make edge detector by using capacitor and resistor. The thing is i don't see it being discharged in any way. Would't it make it impossible to charge again and in consequence make current flow through the resistor and make...

Can anyone tell me what this is??? What is it designed to do? And how new is it perhaps?

I recently made a 8 bit adder and I'm wanting to convert the 8 bit out put to bcd, what is the easiest way I could do this?

First of all, thank you for your kind help. The Rpm and gear selector of my guage cluster from the car decided to stop working. It's a digital cluster for gx81 Mark 2 (image for reference attached below). Upon initial diagnosis I found that one of the power transistor 2SC2334L had blown with a...