Recent content by pebe1

  1. pebe1

    7-segment display

    Feed the 555 output into a CD4026B. That will give you a 16 stage counter with 7segment output. Use the chip's 'carry out' to cascade further 4026 ICs if you require more than one 7segment display.
  2. pebe1

    Oscilloscope calculations

    According to the manual, there is a control marked 'SWP.VAR' (marked 30 in the diagram that shows layout of controls) that allows the sweep to be made variable.  Have you set it correctly?.
  3. pebe1

    Fan Failure Alarm

    Behind each of the four fans you could put a thermistor and wire them all in series. Feed them through a current limiting resistor from a voltage source. Power will be dissipated in them and they would normally get warm, but the fans will keep them cool. Monitor the voltage across the...
  4. pebe1

    Bench Power Supply

    Anyone wanting to build a variable power supply, without all the problems of series regulation, would do well to take this Switch Mode route. http://www.instructables.com/id/Build-your-own-Variable-Lab-Bench-Power-Supply/
  5. pebe1

    ANTI-AGING

    Like I asked, at which.......................?
  6. pebe1

    ANTI-AGING

    At which of the three academies of excellence you attended did you learn this nebulous waffle?
  7. pebe1

    doubt

    Are you saying that the driver should be prevented from adjusting his seat when driving? Simple, - shackle the adjustment bar with a padlock! But surely, this question does not belong on an electronics forum?
  8. pebe1

    doubt

    I cannot understand why you would want to 'lock' a car seat. Is that to prevent someone sitting in it, or prevent someone stealing it?
  9. pebe1

    doubt

    ?????????   Could you explain more, please?
  10. pebe1

    the finer points of electronics - II

    QUOTE "i'm asking as i've been working on a design that to my understanding should've worked. i have a generic NPN restoring the supply voltage and feeding it's emitter output to a 2N2222 parallel to a charging capacitor for a delayed avalanche. somehow the avalanching only works when i swap the...
  11. pebe1

    My ble4.0 usb dongle project, any comment?

    Some sound on the video stating the problem would have helped.
  12. pebe1

    the finer points of electronics - II

    If you are using the transistor as a switch, it makes no difference provided you can apply enough base bias to get the transistor into its saturated state.
  13. pebe1

    the finer points of electronics - II

    How about providing a circuit. One picture is worth a thousand words!
  14. pebe1

    question about PIR

    It may be one of these. http://www.bitsbox.co.uk/data/es0550.pdf
  15. pebe1

    the finer points of electronics - I

    ........or resistive.
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