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  1. kf6bbl

    Using Analog Switches

    Some of the 4000 series analog switches can work above 10MHz, some cannot. I have sucessfully used 4051, 4052, and 4053s above 10MHz. Some 74HC40xx can go to 90-100MHz (Philips, TI, ST). Swing range depends on your voltage rails you run it on. Use a +/-5V supply, and you can go +/-4.5V with the...
  2. kf6bbl

    PCB routing (clock lines and termination) help

    Don't know if it's too late, but here are my suggestions on things to look into. 1)Termination - you mentioned there was none, and you have 1V overshoot on your data lines. That much overshoot means you have no control of your rise times, which is a major factor. Consider some series...
  3. kf6bbl

    RS485/RS232 Multiprotocol Transceiver IC

    Once upon a time I designed an RS485 system with 128 nodes that were on 4 different AC circuits, so isolation was taken into consideration. One approach was to transformer couple all RS485 lines, similar to the approach Ethernet takes. This provide galvonic isolation to thousands of volts. Only...
  4. kf6bbl

    PCB Software Suggestions

    Thanks zapped! A straightforward answer - You would never survive in sales. :) -Bill CE Designer Forum www.cedesigner.com
  5. kf6bbl

    PCB Software Suggestions

    And that is another reason why I have stuck with PADs 3.51 for so many years. I know exactly where each bug is, and how to avoid it. They are minor, bug can be a pain if not anticipated. I got a price of $4K for PADs 2006 with schematic, PCB, and 2 layer autorouter. From another source I got a...
  6. kf6bbl

    PCB Software Suggestions

    I've been using PADs for about 14 years now, back into the DOS days. Yes PADs started in DOS, not the workstation environment mentioned above. Back then we had rules like, save every 5 mintues to a different filename, so when the program locks and corrupts the database, you can step back 5...
  7. kf6bbl

    building a handheld

    Yea, your message is kind of vauge, but if you are looking for something along the lines of a portable media player, we have a review on some of the available refernce designs out there: http://www.cedesigner.com/wordpress/?p=14 Is your £1000 budget per unit, or you are trying to build one only...
  8. kf6bbl

    Timer Circuit Help Needed

    I don't think there is any re-use of anything going from AVR to ARM. -Bill CE Designer Forum www.cedesigner.com
  9. kf6bbl

    Timer Circuit Help Needed

    originator said, "that stove in the picture---I'd love to find the manufacturer of the conductive plastic for that surface" That's a solid glass top. The images for the buttons are printed on the glass, and the capacitive sensor PCB is adhered to the back side of the glass. The Qprox...
  10. kf6bbl

    Timer Circuit Help Needed

    itsmoked said, "...And the mind-screw you get with 555s" No doubt. It's always a bad sign when to the standard method to explain how to use the 555 timer starts with a transistor level schematic of what's inside... OK, I will wave the Atmel flag, just for equal time. :) My limited experience...
  11. kf6bbl

    power supplies

    I've also seen plenty of switchers that have the CE mark and FCC, but in fact are broadband noise generators that will fail you at any test range. Always check, never assume with those things. -Bill CE Designer Forum www.cedesigner.com
  12. kf6bbl

    Timer Circuit Help Needed

    Two questions: 1) What is the application for this circuit? Is is something to do with safety? With large caps and large resistors, 555s become less reliable. If the accuracy of the 2 seconds is important you might think about that. 2) Is this a 'one off' circuit, or something headed towards...
  13. kf6bbl

    Deengineering PCB

    zeitghost, sounds like you have a dishonest vendor, and need to find a new one. In general, my decision as to paying for bare baord test is based on the complexity of the board and what the value is fully loaded with parts. If both are low, then the first test any component sees, both board and...
  14. kf6bbl

    Lead Free Solder

    So for a small US based manufacturer that does less than 10% of it's business in the EU, is it worth the hassle? You have to compare the profits from that portion of your sales to the additional cost of transitining to Pb free, plus ongoing issues due to things like wiskers, etc that could...
  15. kf6bbl

    Lean manufacturing

    I have found that you cannot apply lean to all manufacturing businesses. Just as ISO is not for everyone, neither is lean. I think too many people are attraced to lean because most of the principals are obvious. It's sort of like those commercials for matresses that ask, "Do you wake up...
  16. kf6bbl

    Why is Ethernet Faster than RS485?

    RS232 and RS485 are both asyncronous serial. In other words, the receiving end has to figure out where the bits are in a serial stream. To do this, the transmitting UART will typically add a start bit and a stop bit, and is expected to be reasonably accurate on the baud rate. The receiving UART...
  17. kf6bbl

    Any CE Designers here?

    Yea I know what you mean. That part of the reason I started my site. It's an increasingly small community of engineers in the CE space, so we gotta stick together, ya know! Right now I think the biggest barrier is all the various licenses and 'clubs' you need to join to play. I understand that...
  18. kf6bbl

    Any CE Designers here?

    Any other designers in the consumer electronics business? I've searched the forum, but don't see much activity in video circuits. I've been working with DVI, HDMI, HD analog video, and the likes. What do you think the population of US based CE designers there is. Much of the business has gone...

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