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  1. K

    need major help please

    I my opinion this would require programming a microcontroller for the short time periods and step/direction control, and outboard driver circuitry to power the stepper motor. It could also switch the pump. If you want to be able to alter the times or dose-volume it will require more hardware...
  2. K

    Single Axis Component/Motor?

    I have a NDA too...No Details Agreement. ;) No details...no help. Sorry. Sure. Ken
  3. K

    need major help please

    Does the stepper motor have a driver circuit that controls the step and direction with a simple change in polarity (a fully implemented syringe pump), or is that part of what needs to be designed? Ken
  4. K

    Single Axis Component/Motor?

    ksn, Perhaps you can explain what you are trying to do?...close a curtain?...open a gate?...lift a bridge? ;) The big picture?...what do you want to move?...how far?...how fast? Ken
  5. K

    Function Generator Chip

    ICL8038 is obsolete, but you can find them, though very expensive. XR2206 is available from several vendors. Ken
  6. K

    Motion or vibration sensor

    Maybe a large, cantilevered, peizo speaker element, one end fixed inside a box and a small weight on the other. Poor man's accelerometer. ;) Feed that to an opamp to drive a buzzer...maybe with a monostable to extend the buzz. ken
  7. K

    Hysteresis

    Very easy! ;) Google: hysteresis calculator Ken
  8. K

    infrared car parking sensor

    Go back to the original source: http://www.circuitstoday.com/parking-sensor-circuit Ken
  9. K

    Looking to commission a circuit engineer.

    As an aside, don't get hung up in the 12V only supply. That will be good for getting the needed audio power out, but almost all the other stuff will like likely require either 3.3v or 5.0 v. A switch mode DC-DC down converter will efficiently drop the 12v down to the level required by the...
  10. K

    Looking to commission a circuit engineer.

    Vincent, I hate to say it, but unless you're willing to fork over a lot of bucks, like maybe $10K to have the first one designed, you're probably not going to get much help. What you're asking for is not a cheap and easy, throw together device from off-the-shelf parts...especially when you...
  11. K

    Watlow Process Controller Help

    I've acquired Lindberg parts from Thermo Product Solutions (570-538-7200), that now handles Lindberg service. Do you have the model and serial number of the furnace? Ken
  12. K

    Looking to commission a circuit engineer.

    Everything is probably do-able...but... A very important missing spec: What's the smallest size you envision. Ken
  13. K

    project topics for B.E level

    Apparently you have no experience in those fields. There are electronic applications on all of them. Ken
  14. K

    Rain Sensor

    Did you even look at this: http://www.instructables.com/id/Make-an-acoustic-rain-gauge-disdrometer/ I think you can gut one of these for the piezo element. http://www.radioshack.com/product/index.jsp?productId=2062397 Amplify (if necessary) and count the output pulses with the PIC. Or integrate...
  15. K

    Machine digital readout

    Here's the data on the chip. http://www.st.com/stonline/books/pdf/docs/2420.pdf But, I have no idea how the DRO circuit is set up. Seems that if the backup battery is in the chip, you should be able to swap in a new one. You might ask your question over on the CNCzone web site...
  16. K

    Defusable Practice Time Bomb

    Something like this would be adaptable and cool: http://www.circuit-innovations.co.uk/timer.html With some hacking to access the switches, something like this: http://www.opentip.com/product_info.php?ref=8955&products_id=1456688&affiliate_banner_id=1 or this...
  17. K

    Rain Sensor

    There are many sensors for rain. It depends on what you want to know. Intensity: http://www.instructables.com/id/Make-an-acoustic-rain-gauge-disdrometer/ Volume: http://www.edcheung.com/automa/rain.htm Surface wetting, Capacitive...
  18. K

    Lightbar Flasher

    Yeah sure...and the tech designed the board and program in his head without ever committing it to paper. Can't blame them though, why give away for free what they developed to sell. Did they offer to repair it? Doubt you'll have any better luck with the regulators...for the same reason. Ken
  19. K

    Lightbar Flasher

    The data sheets on both chips: http://www.alldatasheet.com/datasheet-pdf/pdf/74971/MICROCHIP/CF745.html http://www.farnell.com/datasheets/65559.pdf You would have to program the chips, which you probably can't do. The light bar manufacturer has them custom programmed. Ken
  20. K

    Rain Sensor

    What's your sensor? Is it conductive...sensing rainwater forming an electrical path between two metal electrodes? Or something else? Ken
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