1. U

    One-layer vs two-layer PCB question

    Hello i am an amateur maker and i have been using gerber files attached to print my pcbs from chine where they charge the same for 1 or 2 layer pcbs but now my suplayer is charging more for 2 layer . As far as i can see the bottom layer is not necessary but i am not sure so if anybody here can...
  2. Calalalal

    Aluminium PCB corrosion

    Hi Im planning a pcb with a temperature and humidity sensor on it and I'm wondering if aluminum pcbs will have good corrosion resistance in a humid enviroment. A google search didnt turn up any info. Anyone got any experience on this? Thanks
  3. H

    GPS receivers Front-End Design Problems

    I am designing a GPS L1(PWR=-160dBW) band Direct RF sampling receiver and the front-end: (passive antenna + LNA(21dB) + BGA1(30dB) + jumper + BPF(L1(fc=1575.42MHz,BW=15MHZ) + BGA2 (30dB) + BGA3(30dB) + VGA(-13.5 to +18 Gain Control in 0.5 dB Steps) ). all amplifiers are supplied with a +5 V...
  4. all_about_the_dip

    EMC improvements

    Greetings, I've been in a design for a while for my university. It's a security system based on sound(a glass break detector) but the point of the question is not the functionality of the circuit but the EMC issue. I've tried to reduce the EMI but I would like to ask to any expert any kind of...
  5. D

    Searching for an engineer or someone with PCB knowledge base in the Dallas, Texas area

    Looking for someone to do some teaching/consulting about some PCB's in the Dallas, Texas area. We are located in Waxahachie, TX. We are looking to pay for the educational experience. PM me here if you want more information and I'll send you my phone and email and we can go from there.
  6. N

    Covering mounting holes in copper pour in Cadence Allegro/PCB Editor

    Hi, I am trying to get the mounting holes covered in the copper pour but I am not sure what would be the best way to do that. Is using the shape edit to manually edit the shape of the copper pours the only way? Any advice would be appreciated.
  7. marcor2196

    PCB for a home project with Arduino

    Hi all, i've realize a home project based on Arduino (in order to integrate my domestic heater on my Home Assistant system) with a NodeMcu V3 board where i wrote my custom program that use a DHT22 sensor and a TFT ILI9341 touchscreen display to control the behavior of a relay that switch on/off...
  8. M

    What is the output of this VCO?

    I am using ROS-43-119+ from Mini-circuits. I need a VCO that can generate a 40MHz frequency. ROS-43-119+ can generate my required frequency by controlling the tuning voltage. I need sinewave output from the VCO. There is no mention of the output type in the datasheet. So what is the out type...
  9. Lambo Av

    Doubts on How Connector Works

    Hi all, I am currently reviewing this Degson DG2002-4.0 connector. https://www.degson.com/content/details_123_10715.html May I know what does the arrow above the connector mean? And what do the holes beside the arrow does? Based on the photo below, there is this operating tool which can be...
  10. E

    protect PCB board from moisture

    I am using one PCB board in the machine which comes in contact with moisture. I want to protect that board from moisture and getting damage because of it. What are all the preventive options available?
  11. H

    Controlled Impedance Trace-reference plane

    Dear Team, May I know why do we need to place a reference plane immediately below a controlled impedance trace. What will happen if it is not placed Regards HARI
  12. Tentmaker

    Help me ID: Unidentified Components: Capacitor, resistor/fuse (with fridge fiasco story)

    TLDR: ID & ideals on mangled through-hole components, images below: Story: The Torontonian's Tale of the Fridge Fiasco Out with the old, in with the new! Or, so the non-electronics hobbyist will say when an appliance malfunctions. But, me? No, siree bob! Not with a soldering iron and all the...
  13. A

    Help for Testing and assembly PCB

    Hi guys, i need help with my doc. I do have to inspection and assembly PCB board I this is my steps are 1-First, I will make sure the PCB board does not have any damage by visual inspection PCB and see if there is any scratch on the lines that will transfer the power. 2- Check the PCB for...
  14. Hunteru

    Anyone has any idea what this means?

    Hi everybody, Anyone has any idea of what this means ? Here's the complete schematics: It's a line amplifier, and it could be a linear Pot of Fader... I don't know. Thank you
  15. Younes Thabet

    What're design rules to consider in order to have the best chance of complying with EMC requirement?

    Hello guys, I am designing a 2 layer PCB that contains a power part (PSU, Relays) and digital one (MCU, digital & analog I/Os, ..)... I looked up some design rules that should minimize EMI but i am not sure if those rules I applied are sufficient for my board to be EMC compliant!! here are the...
  16. M

    LG Mh6342 control board repair.

    Hay guys, I'm in a grind with this LG microwave control board. It had a gentle but sevier death. Upon inspection found leaked capacitors, two damaged optocouplers , a blown inductor and a pitted IC- LNK 364DN. I changed the caps and inductor. I changed all the parts, although had to jerryrig the...
  17. jcarlson023

    DC Switching linear regular design question

    Hello, I am fairly new to electronics design (I have a mech e background), and am designing a board that requires dropping 12v to 5v with a large current requirement (up to 8A@5V). In a bid to save on BOM, I took a shot at creating my own design vs buying one off the shelf, using the...
  18. E

    How calculate the track width in Altium designer?

    Hey Peeps! Hope you all doing good. i'm currently designing a pcb in Altium designer for 2 motors which will consume a current of approximately 5amp for a very short interval of time like 500ms or 1s max, how much should i keep the minimum track width?? Thanks
  19. 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?
  20. -Teh-

    Need help with a car amplifier repair

    So I have a car amplifier that was making "farting" noises and I took it apart and noticed why it was doing that. Poor connection My question is how would I go about repairing this properly could I just use a wire and solder it to the broken spots to make a bridge?