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  1. S

    PCB assembly in USA.

    I need to put some BGA chips on two identical PCBs. I want fast process so the factory should be in USA. Are there any recommendations? Thanks.
  2. S

    Pad customization in Protel 99se.

    Forgive me for using this antique:bang: I'm trying to customize a pad **broken link removed** What I did is simply placing a rectangle pad and a round pad together **broken link removed**. In PCB editor, it appears to be **broken link removed**. It looks the rectangle pad is partially...
  3. S

    Ultrasonic transducers.

    Thank you Frank. Do you have any experience selecting such an aluminum cone? I only saw people using it, but have no idea where to find. Tried online electronic device distributors but no outcomes... For the receiver, as the transducers are usually frequency picky, e.g. with +/-0.5KHz bandwidth...
  4. S

    Ultrasonic transducers.

    Actually I have a PowerPC and an FPGA that can do precise control and complicated computation. To my understanding, HCSR04 can be helpful in measuring the distance between the module and a single (the nearest?) object. But I think it could be a mission impossible to differentiate the echo of the...
  5. S

    Ultrasonic transducers.

    Thank you for your patient input. I read the HCSR04 datasheet as you recommended. It looks like a combination of an OSC, a transmitter and a receiver. My question is, if there are multiple objects around this module, and all these objects produce echoes, how do I pick the one I want to detect?
  6. S

    Ultrasonic transducers.

    Thank you FvM for pointing this out. Yes, I want to detect the presence of the ultrasound wave. To be more specific, I need to capture the sine wave. What I want to do is to calculate the position of an ultrasonic wave source by calculating the time difference of arrival of the wave at three...
  7. S

    How to improve the strength of PCB board?

    Thank you FvM. My board has several pwr/gnd planes. Hope they will help. Resonance frequency... Is there any way to change it, if it happen to be the worst case? - - - Updated - - - This should help. Thanks. It reminds me of the stiffener I used on my speakers.:lol:
  8. S

    How to improve the strength of PCB board?

    Thank you thylacine1975 for the input. 4mm looks really strong:lol: My board is now 3mm thick and I can't increase it because of some through hole connectors...
  9. S

    How to improve the strength of PCB board?

    I need to install a 20inx12in PCB board on a vehicle. How can I improve the strength of the board so that it won't bend?
  10. S

    Ultrasonic transducers.

    I'm trying to build a circuit for ultrasound detection, and I'm asking for help to select ultrasonic transducers for it. The detailed requirements are: . The distance between the transmitter and the receiver is approx. 30 ft.The transmitter should have low power consumption, so the receiver...
  11. S

    Power plane thickness for low voltage high current supply.

    Thank you for reminding me. I was using the FPGA provider's power estimation tool for the calculation based on the information from my FPGA guy. I'll double check with him to see if it is accurate enough. ---------- Post added at 18:10 ---------- Previous post was at 18:08 ---------- What...
  12. S

    Power plane thickness for low voltage high current supply.

    Thank you for the replies. Yes, it's 50 A and the estimation is reasonable. It's an FPGA with the static current higher than 10 A. I'm working with 12 layers, and the dc-dc is placed right aside the chip. A track over 1.5 inch wide is possible, acturally the current is on the whole plane (of coz...
  13. S

    Power plane thickness for low voltage high current supply.

    I'm design a PCB with low voltage (1.0V) high current (up to 50A) power supply for a single chip. But I'm not sure about the thickness of copper for the power plane. How do I calculate this parameter? Is 1oz enough for it? I saw gigabyte has been using 2oz on its motherboards, but I guess the...
  14. S

    Q: fully-connected resistor network on chip

    To what scale (measured with node number) can such a on chip network, in which any two nodes are connected through a resistor, be implemented using technology that is available now? How about the precision of the resistors (100%, 50%, 10%, 1%, ...)? Can we make the resistors adjustable in a...
  15. S

    Power management IC for portable devices?

    I've been looking for a PMIC with multiple (3, 4 or more) regulators for battery powered portable devices. Small size, small quiescent current, programmable output voltage with enable/disable control, that's the requirement. I'd be appreciate if you could give me some advice. Thanks.

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