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  1. (*steve*)

    Generating Multiple Frequencies

    Then perhaps you should start by telling us exactly what you want to achieve rather than how you think it can be done. What exactly do you mean by "track[ing] a bb gun pellet?"
  2. (*steve*)

    Generating Multiple Frequencies

    Why not use a single frequency (around 40kHz is commonly used) and modulate it with a binary code? 8 bits will give you 256 combinations. The receiver simply needs to decode this and compare it with a configured "address". There are devices which will return the binary code serially (a...
  3. (*steve*)

    Voltage regulation

    Is this homework or an actual problem? (or was this the "just to understand") In any case, the answer depends on what else is on the board and whether you want efficient or electrically quiet.
  4. (*steve*)

    Li-Ion battery end of charge detector

    I'm sure I answered this. Oh well. The traditional method of detecting end of charge of when the current at the final voltage falls below some predetermined value. As for which chip to use, go to digikey and search they're. You can for by package.
  5. (*steve*)

    Voltage regulation

    Is this homework or an actual problem?
  6. (*steve*)

    precise speedometer

    you could use the Apollo lunar rover method. Measure the speed of each wheel and use the third fastest (or the second slowest). you may be able to use g force sensors to compare expected acceleration with actual acceleration in order to tune rotational speed with velocity., although GPS would...
  7. (*steve*)

    anyone to help me out?

    Google... Seriously. office --> libre office
  8. (*steve*)

    Playing with valves

    No, they're evacuated glass IC's, aka compactrons.
  9. (*steve*)

    Playing with valves

    It's far cheaper to make them. And faster. And with as many pins as I need (found any reasonably priced 12 pin valve sockets?) We're in an era when the valves cost less than the sockets.
  10. (*steve*)

    Laminator for PCB's ?

    It's a cable specially modified to allow a clamp-on meter to be conveniently used to measure current. You mean you don't have one of these?
  11. (*steve*)

    Laminator for PCB's ?

    Here's some pictures of my colleague's mk:2 laminator. This one handles board up to 300mm x 300mm.
  12. (*steve*)

    Playing with valves

    And now I have a pair of valve breadboards. Shown with valves plugged in.
  13. (*steve*)

    Laminator for PCB's ?

    Actually, read this before you commit to anything.
  14. (*steve*)

    Laminator for PCB's ?

    I'll find out as soon as possible. I have a number of things on today, so I may have to send my wife to the post office on Monday. If you can PM me your address it will help.
  15. (*steve*)

    Laminator for PCB's ?

    No, I meant I'll buy you one and send it to you. (I'm using mine :-) The freight is likely to cost multiple times more than the laminator. I can find out how much it would be if you're interested.
  16. (*steve*)

    Transformer

    Please ignore Colin. He is full of half-truths. You need to do something to limit both the current and the voltage into the battery otherwise you risk overcharging it.
  17. (*steve*)

    Laminator for PCB's ?

    I have one of those. There is a modification on the net describing how to use it to do toner transfer. It does accept 1.6mm PCB material pretty easily. Do you want me to send you one?
  18. (*steve*)

    Laminator for PCB's ?

    I'll try to get you pictures. vertical means the board goes in the top with a thin edge facing downward. A bit like a toaster, except it doesn't pop it up :D
  19. (*steve*)

    Why DC motor draws more current with friction?

    the "wall plug", unless it is regulated will exhibit the same effect.
  20. (*steve*)

    Why DC motor draws more current with friction?

    that's nothing to do with the motor. It's the batteries.
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