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  1. windoze killa

    PCB Stuff....

    Without going into deep detail FR4 is the fire retardent level. FR4 is the most common higher quality type. FR2 is used in cheaper consumer type products. The HASL is basically tinned tracks. The other 2 are electro deposited gold or silver coatings. Much more expensive.
  2. windoze killa

    Voltage Regulator Question

    If you are trying to produce a 5V supply and you can't use a 7805 because you only have a 5V input then why not just use that 5V supply.
  3. windoze killa

    Local Positioning System (I need some help)

    Most of the system would be run using microcontrollers. You would have to write the code to suit. Basically you would send a request to each car and time how long it takes to get a response. From this you can calculate the distance. The ID would be part of the response.
  4. windoze killa

    0 ohm resistor

    I missed this post before. Not quite sure hore you can make this statement. A small chip of metal film with 0 ohms would have such an insignificant inductance it would be useless. About the only way I could see this happening is if it was a wire wound 0 ohm resistor
  5. windoze killa

    0 ohm resistor

  6. windoze killa

    sending a beep into the telephone line???

    You could also use an optocoupler.
  7. windoze killa

    Local Positioning System (I need some help)

    6" shouldn't be a problem so long as you aren't trying to do it over 50'. Reverse parking sensors on cars are ultrasonic and they are pretty rough in design. So a PC based decoder system should be easy.
  8. windoze killa

    0 ohm resistor

    We use 0 ohm SMD resistors all the time. They are mainly used as links. We design the boards so there are different configurations available. The resistors are placed to select different options.
  9. windoze killa

    Is bluetooth safe?

    I worked on 10KW HF transmitters for years and it never affected me, me, me, me,........ ooopppsss
  10. windoze killa

    Soldering: what am I doing wrong?

    If you use the correct type of soldering iron set to the correct temperature, prepare and clean the pad and component, apply liquid flux and don't be on the joint for more than 3 seconds then there is no need for a heatsink clip. These will just suck heat away from the joint and actually cause a...
  11. windoze killa

    excess-3

    Sounds like a micro might be the easiest for this job.
  12. windoze killa

    Local Positioning System (I need some help)

    I would assume you are going to do all this with some PC or micro. If this is the case then you could track as many cars as you would like. You would just have to give each one an ID number and poll the system to check for each car in turn. All this can be done in fractions of seconds. The...
  13. windoze killa

    excess-3

    There are a few deciaml to binary/BCD chips available. Have a look at http://pdf1.alldatasheet.com/datasheet-pdf/view/27380/TI/SN74147N.html
  14. windoze killa

    Is bluetooth safe?

    Does this mean you will stop using your computer???? It probably radiates more RF than a bluetooth device. There is so much radiation floating around these days. All the power wires running through your house and out in the street.
  15. windoze killa

    power line communication

    There are also some areas in Tasmania over heer in OZ that are using power lines (the big ones outside) for telephone and internet. Got the phone companies running scared.
  16. windoze killa

    Local Positioning System (I need some help)

    How about ultrasonic transducers. You can have a couple on the car so you get 360 degree coverage. Place about 4 transducers around you driveway (one in each corner). If you can produce a timed pulse from the car you can measure the time it takes to be received at each of the recievers and be...
  17. windoze killa

    Soldering: what am I doing wrong?

    Its the multicore one that I use. Works well but should really only be used at a minimum for reguvenating your tips. Say every half hour or so. Too often people forget to clean it off before doing a joint.
  18. windoze killa

    Soldering: what am I doing wrong?

    See if you can get hold of a pyrometer and check the tip temp. Another method of checking tip temp is to grab a piece of HMP solder (High Melting Point). Load the tip up with normal 60/40 solder. Place the HMP across the tip. At 300C it should melt through in 1 second. If it is melting in less...
  19. windoze killa

    Soldering: what am I doing wrong?

  20. windoze killa

    Knight Rider with Halogen Bulb

    try replacing the TIP32 with a relay. Another option, replace the 1K resistor with a 470R. This would turn the TIP32 on harder. But I think the relay would be the best shot.
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