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  1. K

    Quiz buzzer system

    These are pretty inexpensive: http://www.mpja.com/Plastic-Enclosures-and-Boxes/products/476/ Ken
  2. K

    Illuminated push to make switches

    Have you considering asking them about what switches thy used? Ken
  3. K

    Illuminated push to make switches

    Can you indicate on the photo what "switch" you are talking about? Ken
  4. K

    How would make a smelly flatulence (fart) remover for a person with colostomy bag?

    Ken, I started with those, then switched to the disposable pouches so I didn't have to deal with it so often.. My big problem is the cities' residential garbage bins pickup. I dispose of ~14 pouches a week. I double bag each one. It was so-so during the winter, but as the weather has gone above...
  5. K

    How do I simulate a double throw, single pole, voltage controlled switch in LTSpice?

    It's called a relay. ;) But doing a little Googling, maybe LSpice doesn't have relays. Ken
  6. K

    Data collection from BMI scale

    Is this a modified bathroom scale or a commercial product? Ken
  7. K

    How do I simulate a double throw, single pole, voltage controlled switch in LTSpice?

    Two switches of a CD4066 plus one inverter? Ken
  8. K

    How do I run a dc motor slowly?

    "There isn't much room in the mode...l" So, what are we to consider? Ken
  9. K

    Topic for presentation

    Early basic logic circuits with resistors, diodes and transistors: RTL, DTL, TTL Ken
  10. K

    Topic for presentation

    IoT! Ken
  11. K

    I Need Help With My 555 Monostable Circuit Please

    Do you have a schematic of what you are trying to wire on the breadboard? Ken
  12. K

    DC 15 seconds motor timer operated via push switch

    So you need the motor, controller, and an on-timer? More details would help. Like supply voltage available, motor torque...what you are trying to do. Ken
  13. K

    Quiz buzzer system

    Why did you connect the handheld boxes into another box then to the main controller? Why not just connect them to the main box? Originally the cords for the handheld buttons were ~25' long and plugged into the 8 coaxial power connectors on the side of the master box. This was for use in a small...
  14. K

    Quiz buzzer system

    Belle, A little more. The handheld trigger boxes are 1"x2"x3". I realized that I made this 14 years ago. How quickly time passes when you're having fun. ;) Ken
  15. K

    Quiz buzzer system

    I'll have to see if I can find it tomorrow to answer your questions. It's wandered around campus for years. I originally made it for a Biology Professor to make finals prep fun for their classes. It isn't exactly set up for two teams. They would group three students per button, with up to 8...
  16. K

    Quiz buzzer system

    Here is a two-wire version of 73's de Edd's. Also a version of the original design I referenced in post #14. There is an LED on each contest's switch, and a buzzer when anyone buzzes in. It's simple and infinitely expandable.. It can also be daisy-chained (parallel). Originally I had long wires...
  17. K

    IR led light powered by car battery.

    The lamp is spec'd at 12VDC/15W. So it will only draw 1.25A. It has internal current limiting. "Generally" when LEDs are spec's as a specific voltage, like 12VDC, they have internal limiting. Ken
  18. K

    One switch to turn on multiple sockets

    If you don't know, then you need an electrician. Ken
  19. K

    Quiz buzzer system

    Used that circuit many years ago. Simple, expansable,worked great. I added a buzzer across the moderator's lamp. Ken
  20. K

    Vacuum in a Can

    If you haven't don it already...Google: DIY vacuum tube Lots of info from people that have done it...or tried. Ken
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