1. M

    Help! Triac operation for AC motor

    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...
  2. K

    Clock edge detector using capacitor and resistor problem

    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...
  3. C

    Please help!, What is it designed to do?

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

    Need help. 8 bit binary to bcd conversion

    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?
  5. M

    Help. Looking for replacement for power transistor.

    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...
  6. Arduinoob

    MOSFET for boost converter

    I am making a boost converter following this Tutorial but I don't have the exact MOSFET. I have 2 motherboards laying around and they have some MOSFETs on them some of the names are: P3055, K3918,6670AL(datasheet inserted). There are high switching speeds but the datasheets don't have the max...
  7. IgnacioMorac

    Can I Turn On an XBee, ATMega328, RTC DS1307 and Catalex microSD adapter

    Hello partners I am an engineering student and I am doing my graduation project. I try to send information from the Photovoltaic Panel to the computer. In order to do this, I made a design of a circuit that can measure the voltage of a panel that is generating between 25 and 44 volts. This...
  8. E

    [help] LED matrix demonstration for climate change

    Hello! I'm a junior undergraduate pursuing a degree in electrical engineering and I have a project idea I've been doing some research on. I have some experience in mBED microcontroller programming and design (like PWM and serial connections). I also have some experience in PCB design and...
  9. Johnguru4life

    Up/down control for 1.5kW motor

    Please I need help in making a circuit that can make a single phase electric motor of 1.5kw to lift a load up and down by holding to its different switches. Thanks
  10. R

    How to power an old LED lamp via USB

    Disclaimer: I'm not an engineer, just a DIY enthusiast. So I have an cheap old plastic SMD LED desk lamp but its battery and circuit board are missing. I want to turn it into a USB powered lamp for my new apartment but I'm not sure of the best way to power it. It has 31 LEDs and the label on the...
  11. M

    Measure analog value in MCC

    Hello, my name is Niklas and I just have a problem with the analog measurement of a value. I use a PIC 16F1827 and program in MCC. I would like to perform a current measurement via an ACS712. My first problem is that I need to measure about 300 mA. Therefore I have to change Vref+ and Vref- of...
  12. D

    Electronic circuit for a dispenser

    Hi, I would like to request help from anyone who can help. I am currently doing a project which is creating a simple dispenser. This dispenser requires a programmable timer which when activated will cause a motor to rotate a piece of acrylic for about 0.75-1sec to release sand granules. The...
  13. O

    New to soldering, how to solder mini USB connector?

    My friend has a broken blue snowball microphone and its powers by a mini USB cable plugged into a computer, the mini USB connector somehow broke off the board and has been rattling around its casing, I opened it up and found where its supposed to be connected, is this saveable? could I just...
  14. Smapa

    DIY Hot Wire Foam Cutting Table (not working)

    Hi I am trying to build a hotwire foam cutting table and my wiring and parts are functioning but not the way they should as the nichrome wire is not heating enough and my dimmer stops at 60 (before it stars flickering) rather than 100, my knowledge for this sort of stuff is whatever comes before...
  15. RIKRIK

    Question about transformer.

    Hi . I recently acquired a 250vac 240v to 24v transformer. Which i am going to use for a project. Just want to confirm my numbers are right. 3 things. 1)That @24v the maxium i can draw is 10a. 2) 24×10= 240watts. Would a 1a fuse on the 240v side do as suitable protection. 3) As i have a earth...
  16. A

    Function Generator-Help.

    Hello guys! I have a problem, I want to build a triangular and rectangular signal generator with adjustable frequency between 5Hz and 1kHz , output current of 60 mA and Uvv=5V. I have a figure but when I increase Rf the amplitude increases and is limited after 100 Ohm. What should I do? Thanks...
  17. N

    Multiplexing channels in Labview

    Hi there! I am working on something similar and would appreciate if you could drop the vi. Much appreciated! Moderator Edit: Thread split off from this: https://forum.allaboutcircuits.com/threads/about-function-generator-and-multiplexer.138826/
  18. WakelessFoil

    Mystery Transformer on CNC

    Hello I’m new here but I’m in need of someone more experienced than I am. I’m working on a Japanese CNC mill from the early 1980s for my boss and I cannot figure out how this transformer is supposed to be wired. It has two inputs either 220v or 480v. We are feeding it 220 and that comes out...
  19. J

    Please help! 3-Phase rectifier + buck converter

    Im making a project where I need to rectify a 3-phase generator and charge a 12V battery. My buck converter is simulating fine using a DC source but when I connect my rectified power supply it messes everything up. This is my rectifier output. This is my schematic This is my rectifier's...
  20. G

    Design of 8-bit shift register

    Hi! I'm a student of Electric Engineering and I got a problem on a Electronic project. I have to make an 8-bit shift register with serial input and serial output. The basics of the project is that it has to have two push buttons: one will be a logic 1 and the other a logic 0. The shift register...