1. J

    Choosing the right varistor

    Hi, I work for company in the UK as an electrical engineer. I have just started at my new place and they have a 3-phase pump motor controller that needs replacing. It's a Coelbo Onematic controller, working off the pressure in the water line. I have a new controller unit but don't want to wire...
  2. D

    Help with a design

    Hi guys, I am new here. FYI before I get started, I am not an engineer, designer, programmer, or anything of that nature. I’m just a dude who loves a challenge, and I love diy home projects. Now, I hope this is the right forum to ask this kind of question! So let me get started: I have lately...
  3. H

    Unknown SMD Component

    I'm trying to find the components of the PCB I have. But I have a problem with a 5 pin (I guess SOT23-5) component. Can someone help me abuot this? There are version1, version2 and version3 of the PCB and marking codes are AA43, AA44 and AACB respectively. There are reset button and error...
  4. S

    How to wrap a inductor around a resistor on PCB?

    Hi, I am working on a school project and need to wrap the inductor around the resistor , how can I implement this in kicad?
  5. N

    Name of this component?

    my indoor Air conditioning unit short-circuited after cleaning and this is the component that gets damaged. currently i replaced the entire board from a similar air conditioner and it works, but I'm wondering if I could fix this board. I'm new here so not sure if this is the right place to ask...
  6. E

    Designing PCB with multiple RF circuits

    I need Tips and recommendations on how to design a PCB with multiple RF circuits. In my case, the PCB includes a GPS receiver, 802.15.4 2.4GHz, and 433 MHz transceivers. I plan to use a GPS module with a patch antenna. The 433 MHz transceivers will have a PCB or ceramic antenna. an external...
  7. Swaysceptile

    How do I combine these two electronic circuits into one schematic (for project)?

    I started the basics of PCB and doing schematics around 6 weeks ago in my Computer Engineering Drafting and Design class. We used EasyEDA online tool to create the SCH and PCB for our assignments/activities. Our project now is to combine the circuits that we have made before into one system so...
  8. Swaysceptile

    How do I combine these circuits?

    We have a project coming up in my Engineering Drafting and Design class and I don't have much idea yet on how to accomplish it. We are tasked to combine different circuits to design one complete device. Then we need to of course make the Schematic (and simulate it), as well as creating the PCB...
  9. H

    Three chips for PWR_SRC_NVVDD?

    Hi, I have a ms-16w11 motherboard which was shorting when adapter was plugged in (light went off on adapter). I started testing and measuring and found a chip named PU15 on the schematic to be problematic. I removed the chip. When plugging the adapter back in, the laptop powers on but the screen...
  10. D

    PCB, Tips and pointers if you've got a minute

    Hello everyone, I have taken a circuit from breadboard to PCB and I am having some issues with a few components. The device is a power controller designed to monitor 2 batteries. 1 battery is a backup battery and the other is the main battery. The main battery is also a starting battery for an...
  11. 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.
  12. S

    Large discrepancy in measured and specified capacitances when soldered onto PCB?

    Hi, Not sure if best to post in general chat or power electronics, but: I am having some significant issues when measuring my power converter capacitances with a hand-held LCR meter than I expect from the specification. I have a series-parallel combination of capacitors that should give an...
  13. Younes Thabet

    Can i put E-waste disposal marking on silkscreen !?

    Hello, Can i put E-waste disposal footprint (see image below) on my pcb silkscreen layer !? Or does does my board have to pass some inspection or conforms to specific regulations before i can put it on my board!!? and what other markings that i can put without the board passing through some...
  14. J

    Please somebody tell me what will be output watts of this PWM circuit

    Detailed description and website link are below. Parameter: 1>.Product Name: pWM 4-Wire Fan Temperature Controller 2>.Work Voltage: DC 11V~55V 3>.Work Current: 0.1A(MAX) 4>.Fan Current: 5A(MAX) 5>.PWM Range: 5%~100% or 0% 6>.PWM Frequency: 20KHz/2.5KHz 7>.PWM Signal Amplitude...
  15. T

    Non standard Flex Rigid PCB Design

    Iam looking at trying out a Flex rigid design to save some component cost,etc my current design has 5 ribbon cables running from a main pcb to sub pcbs.I can only find flex rigid designs that have the flexible pcb start at a edge of the rigid pcb, my question is could i have the flexible pcb...
  16. finconv

    EMC vs Isolation

    Hi to all, I'm desigining a PCB with an Eurocard size that will be used in a subrack. The board is connected to a mother board internal to the subrack and have some connector on the frontal side. On the frontal side, the boards are covered by a metal front panel (chassis) that will be connected...
  17. M

    Swapping DC Jacks

    Hey guys, need a little help here, completely new to this. So I own a Pioneer XDJ 700 and the DC input jack (12V, 2A) has been bent so has a loose connection. Of course Pioneer being Pioneer, in the same fashion as Apple, have made their DC connections different to everyone else's so they're...
  18. D

    Creepage Calculator for 24VAC

    Hi All I am working on a PCB, which needs to provide 24VAC to various solenoids. The max current each solenoid will require is about 0.3A-0.5A, but i would prefer to design for 1A. On the PCB layout design I believe as its AC power a design would need to incorporate creepage. Is this...
  19. S

    Collision errors on Altium when connecting component thermal pad to bottom layer copper planes

    Hi all, I keep getting the error Clearance constraint (collision < 0.254mm) between via on multilayer and pad on top layer". The top layer is a thermal pad, bottom layer is a copper plane that is connected to the cathode of the diode. It is a Cree SiC diode, and it should not be connected to...
  20. M

    Understanding of Thermal metrics of PCB, heatsinks, How heat flows/converts - Books recommendation

    If i can't ask these kind of book recommendations here please suggest another forum. I want to understand more about Thermal metrics of PCB (Like how traces, Vias, planes etc interact thermally how they will get cooled), Heat sinks designing (like Fin structure, spacing, materials how they will...