troubleshooting

Hello everyone, I recently aquired a marshall Kilburn speaker on a retail website which said it was properly working. The issue is that it isn't, I asked the guy who sold it to me and he said he used it mainly on sector because the battery wasn't working (15-20 minutes autonomy instead of...

Hi! I've made my own PCB layout, that I've etched my self. The circuit works on breadboard but once i made the PCB there are major fluctuations in the oscillation. I power it on and it oscillates at around 16kHz to then every now and then dip down to a more audible range but its very "jittery"...

I have designed a PCB for a small battery powered hand-held gaming device that utilises the ESP32-S3. I used the ESP32-S3 Zero dev board as a reference and closely followed the recommended layout from the chip’s datasheet. The PCB was manufactured by JLCPCB however it is not able to connect to a...

We've (@rpschultz) recently discovered that the buffer circuit we have in our upcoming tuner makes a nasty high pitch noise if the output is plugged into an amp and there's no input cable connected to an instrument/guitar. We're currently using the TL072 option (ignore the OPA1642 in the...

I apologize in advance if I violate any forum conventions here. If that happens I will adapt postings accordingly moving forward. Context: I have been working on a PCB design that incorporates the TPS61090 (Boost converter) and MCP73871 (Charge controller) of Adafruit's Powerboost1000C. I've...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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 +...

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...