troubleshooting

  1. A

    Dso138 lcd issue

    I Recently got hold of a dso138 kit, upon finishing the kit I went through testing all of my voltages and everything appears correct. The LED flashes once when powered on but only when the LCD screen is not plugged in. If the screen is plugged in, absolutely nothing happens and when I check my...
  2. babysettlers

    Troubleshooting for mod-60 counter with start/stop and reset functions

    I am given a school project where i have to design a mod 60 counter with start/stop and reset functions on a digital trainer breadboard circuit using two 4-bit binary counter IC chips (74LS93). I am also able to use other basic logic gates such as NAND, NOT, AND and OR gates to construct my...
  3. R

    Combine grain loss sensor questions 2: Electric Boogaloo

    I'm back. Sorry about letting the tread go cold, but we got busy in the field. If I have new eyes and brains here, the old thread is here: Combine grain loss sensor questions | All About Circuits . We used the combine to cut rye, and I managed to catch (as a couple people mentioned) that I...
  4. R

    Combine grain loss sensor questions

    Hello, I am a farmer not an electrical engineer, but I have recently been trying to learn more about the electronics we use in farming. I have been trying to troubleshoot the grain loss system on our combine that hasn't worked in years. Keeping in mind that I am a farmer, as I understand it the...
  5. M

    Troubleshooting Differential Signal Issues with DS26LV32

    Hello, I wanted to reach out to this wonderful community to seek some guidance regarding an issue I'm facing with the DS26LV32 and DS26LV31 ICs on my board. I believe your collective expertise and experience can help shed some light on this problem. In my current project, I am utilizing the...
  6. alexbez

    DIGITAL PIANO NOT WORKING

    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...
  7. eSk8orDIE.Net

    Unexpected results using dual power adapters, diodes and relays

    So I have a couple water level sensors(4 wire, vcc, signal(vcc clone), ground, mode(NO/NC) , a 10w water pump and a couple 12v SPST relays powered by 2 seperate power adapters (12v 5A and 12v 1.5A) The way I have them hooked up is so that the low level sensor is always on and plugged in. If...
  8. copyleft

    Dent in PCB

    Hello, I was unmounting a pair of headphones (JBL TUNE 760NC), and when removing an ear up, I pushed too much on my knife and I think I made a dent in the PCB, as you can see on the photograph. I would like to know if this will prevent my device from working again, and if so, how to repair it...
  9. brianWreaves

    Power board have built-in protection circuit to prevent electrocution

    Are power boards designed with circuit to help prevent electrocution? While testing the 240V power board (BN44-00807A) in my Samsung UA50JU6400 TV, I shocked myself. I was testing the voltage output to the LEDs with my meter and unfortunately touched the metal shaft at the end of the meter's...
  10. W

    Converting 1.5V from AAA cell to 0.8V output

    Hi all, I'm designing a circuit that needs to take 1.5V from two AAA cells in parallel and outputs 0.8V to a DPDT toggle switch (on-off-on) that connects the load to +0.8V, 0V, and -0.8V depending upon the switch position. The output current would ideally be able to reach up to 1.5A for safety...
  11. ChrisWhite85

    Solar LED Troubleshooting and Learning

    Hi all, I have a Solar LED Light that is not working, and I want to use this to get back into electronics a little. I'm a Control Systems designer, but this level of electrical work still creates a lot of confusion for me. So I am hoping to use this as a learning project. The board is a...
  12. xenon_eleven

    Active Butterworth Bandpass Filter unexpected peak

    I am currently trying to design a bandpass filter in a simulator for a university assignment to the following criteria: Frequencies below 1KHz and above 250KHz should be attenuated. Note that you will need to calculate the cut off frequencies given the pass band (1KHz to 250KHz) should not be...
  13. S

    Why Micro SD card can't log the data when we connect servo motor ?

    Hi guys, recently Iam making a project which includes Arduino Nano, MPU6050, BMP280, micro SD card module and a servo motor. Brief explanation of my project is basically I am trying to collect data from the MPU6050 and BMP280 and log that data with the help of a micro SD card module and the job...
  14. Bbrandonparran

    Ne555p problems. Inexperienced. Help..

    Okay, so recently got into breadboards and learning about electrical engineering and computers. And by recently I mean 3 days ago. I have an ne555p chip. I am trying to make an astable clock signa for my projects. lI have no way of showing a diagram. R1-2k R2-100k c1 10uf c2 10uf(across +...
  15. K

    Diagnosing/repairing a Laptop motherboard?

    Hey guys! First time posting here! I have an Alienware 17 R3 laptop that I picked up broken to see if it was repairable (I like learning new skills). All signs point to a short on the motherboard, I plugged in the charger and the blue LED on the charger cable goes out immediately if I attempt to...
  16. Crazy_BJT

    Troubleshooting/repair Hameg 1500 scope

    Hi there to you all, I need some help with a troubleshooting/ repair. I have an analog/digital oscilloscope Hameg HM1500, it has some RTC problem, it presents a partial sweep. I think is the horizontal circuit, that's either missing a voltage or there is some faulty component. The only problem...
Top