1. Fishtacoburritosupreme

    Psu transistor please help

    Please can anyone help me determine what type and model of transistor this psu uses(voltage, amp, etc), the one it had were removed and I have no idea what Trans use D:
  2. I

    T.I. BLE USB MCU Programming Trouble (CC2540)

    Hello Everybody! I am trying to program/communicate with the CC2450 BLE IC, which is a transceiver/microcontroller. My computer is having trouble recognizing the device. It does not show up in Device Manager. I've tried the T.I. tools for trying to communicate with it. I've downloaded the BLE...
  3. M

    Who Knows MOSFETs - Can Noise be Reduced? (Dimmer circuit)

    Hi, I created the following circuit here. The DIM Control Pin sources a 10uA current. I am getting 0.5V of noise on that pin (looking at the oscilloscope). It probably has to do with the GNDA being connected to the MOSFETs. And probably to do with my PCB layout. Currently, I don't have...
  4. pcbdaddy

    Suggest advanced PCB/PCBA manufacturer

    I'm working on several projects where I have 6-8 layer HDI designs. I need to find a cheap and affordable PCBA manufacturer either locally in the US or in Aisa? Anyone can suggest a good and & verified option?
  5. ehabawni

    Communication failure using PCA9615 Differential I2C Bus Extender

    I have used PCA9615 differential I2C bus driver in one design to extend the I2C bus over CAT5 cable. (datasheet https://www.nxp.com/docs/en/data-sheet/PCA9615.pdf) The design has been done according to the datasheet recommendation and with the help of a reference design of a popular open-source...
  6. circuitdiver

    Arduino Audio Shield PCB Design Considerations

    I'm using the Adafruit Metro M4 (Arduino compatible) microcontroller to build a MP3 player. I'm using the following components: Adafruit Metro M4 feat. Microchip ATSAMD51 Adafruit VS1053 MP3/AAC/Ogg/MIDI/WAV Codec Breakout SparkFun 16 Output I/O Expander Breakout - SX1509 I2C Encoder V2...
  7. A

    Broken connector on Nespresso Machine PCB. Is that something that can be repaired?

    Hello I don't know much about Electronics but unfortunately broke a connector on my Nespresso machine's PCB while trying to DIY repair a mechanical part. It's a type 2651 cable but when I tried to disconnect it, I pulled off the connector that was soldered to the PCB. I've attached pictures of...
  8. F

    Resources for troubleshooting power supply board safely?

    tl;dr - I'm a newbie in Ghana trying to troubleshoot the power supply board for my projector that died in a power surge. I have replaced visibly compromised capacitor, but need to test others. Where can I find resources on how to do this safely? Hi all - I'm an American living in Ghana and my...
  9. M

    Gate Voltage dropping under load condition

    We have designed a custom board using the MABC_001_DP000L. We are Using this custom board to provide Biasing voltages to the QPA1022 Amplifier. We tested the custom board with the following set-ups:- SETUP-1:- WITH NO LOAD(Power amplifier) Under this setup Gate voltage is being generated and...
  10. R

    Step-Down Converter Circuit Works on Breadboard but Not PCB

    Hello all! I have a problem where my step-down converter circuit works on my breadboard but not on my PCB. Essentially, I'm using a Teensy 3.2, a stepper motor, a stepper driver, a CANBus driver, and an encoder to be able to control a stepper motor and get position data over CANBus. I have it...
  11. J

    Doubt on which type of film capacitor to use

    ']https%3A//i.ibb.co/wCPxShQ/IMG-20200826-174720.jpg[/img]'] Hi. I have a PCB which has a faulty Panasonic ECQ-UL polyester film capacitor that needs replacing. The capacitor is used as a capacitive power supply and the board goes haywire when this cap becomes faulty. The board is from a...
  12. Mooafwsa

    PCB design use with stepper motor

    I'm currently looking for a solution to a problem I have and I need to create a circuit to later develop into a PCB and these are my requirements: - I need a device to rotate a circle with 8 intervals one interval per day. - I also want a switch to reset the device once it has completed its 8...
  13. H

    Custom standalone atmega32u4 pcb showing up as unknown device

    Hi there, I am having issues with a standalone atmega32u4 project i've been working on and was hoping someone would be able to help :) I have designed a pcb that uses the atmega32u4 to recreate the arduino leonardo. I have been able to successfully burn the Arduino bootloader onto the chip...
  14. A

    SWD USB connection

    I will be building my own board STM32 for my projects, I've noticed people always put breakout sockets for SWD. My question is why? why not make it connected to the usb port for simpler debugging/uploading code
  15. fr0ntsight

    What is this? I can't even get the solder to melt.

    I'm simply trying to learn and practice soldering and desoldering. I have an old board i am working on and can't for the life of me get ANY of the components off. I can't even get the solder to melt. Do they use something other than solder during manufacturing? Here is a picture. I have...
  16. R

    Circuit Works on Breadboard But Not PCB

    Hello all! I've been trying to send and receive a signal by using TOSLink optical transmitters and receivers from Sys-Concept in the same circuit (making a transceiver of sorts): http://www.sys-concept.com/toslink_receiver.htm According to the data sheets of both the receiver and the...
  17. P

    Thermal Analysis of Schematic

    Hi, I want to do thermal analysis of a PCB Schematic and am searching for software to do it. Can anyone please suggest a software to do the thermal analysis. Thank you. Regards, Raj
  18. nextofyourpcb

    Getting Your Morning Mix Exactly Right, Every Time

    Hi. My friend Conradie makes a new idea about the morning mix machine. In historical times, before the pandemic, most people had to commute to work in the mornings, and breakfast often ended up being a bit rushed. [Elite Worm] is very serious about getting his breakfast mix exactly right, and o...
  19. A

    Single supply chain drift the reference output voltage

    Hi guys, So I'm simulating a LPF with a non inverting op amp. I am doing a single supply design. My problem is the following : for I reason that I do not understand, my final gain stage (U6) makes the voltage output reference drift. My main supply is 5V, and my reference supply is 1.25V. When...
  20. G

    RF Amplifier Query

    Hi everyone I have a RF Long wave transmitter (broadcasts only to 10ft diamater). However there are no rf amplifier products available on the market to purchase. Does anyone know where I can get schematics to build one? (I know what transformers, diodes, transistors, capacitors, and resistors...