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  1. K

    Oscillating pulse to stable

    Sree, Is this somehow related to your other threads? buzzers/delays/555? It really helps if you tell us what your overall goal/project is. Ken
  2. K

    Trying to build a timer switch

    Steven, If you want to buy one, Google: photogate There are commercial ones like: http://www.novatech-usa.com/Products/Mechanics-Educational/DTPHG1?gclid=CIC4q_HW8MoCFdcYgQod4nAOoQ I've used cheap stopwatches to time periods. Used LEDs or laser pointers and a photo transistors to detect the...
  3. K

    Trying to build a timer switch

    "If you are trying to measure falling objects you will find they all fall at the same rate." Only in a vacuum! ;) Ken
  4. K

    Radio for the space.

    Radio waves travel at approximately the speed of light. There is nothing at this time that will accelerate radio waves faster than that. Your signal will reach across the Universe at the exactly same rate as all the other RF noise we are already sending out. "But I found decision, my friend -...
  5. K

    Tone Detector

    See page 6 for the output characteristics: http://www.njr.com/semicon/PDF/NJM567_E.pdf Ken
  6. K

    Radio for the space.

    If you want to help look for aliens, on the receiving end, join SETI at Home: http://setiathome.ssl.berkeley.edu/ Ken
  7. K

    Simple Circuit sound board recording project to build from scratch

    http://www.digikey.com/product-search/en/integrated-circuits-ics/interface-voice-record-and-playback/2556441 I've used one of the earlier versions of these ICs for recording and playback addressable segments. Also Google: sound recording IC Ken
  8. K

    I need Cycle Timer circuit. 1 hour on 1 hour off and continues

    Kashif, What motor are you using to turn the eggs... voltage and current? Ken
  9. K

    Time Base and Crystal

    Is this an academic question of accuracy of 1 sec clock output from low vs high frequency crystals? I can't help with that. But if you need a fairly accurate 1-second clock source, gut a 1.5V battery operated wall or desk clock. I don't remember the last time I had to adjust one of these clocks...
  10. K

    Looking for flight instruments etc. inexpensively

    You might be able to pick up some cheap or free by contacting avionics repair shops. Ask about "red tagged" instruments. These are unserviceable or scrap. Google: aviation instrument repair shop You might find some in your area. Ken
  11. K

    free cloud or open source schematic tool

    ExpressPCB http://www.expresspcb.com/ Ken
  12. K

    MIMO OFDM

    Have you Googled for pertinent articles: UKF algorithm channel estimation Ken
  13. K

    Making a motor pulse on music

    What size motors...voltage/current. What will they be turning? I think inertia would be a big factor here. Ken
  14. K

    Making a motor pulse on music

    Curious...What do you want the motor to do as it is turned on and off with music? Ken
  15. K

    Frequency conversion from 400 Hz to 50/60 Hz

    Maybe something here? http://www.unitronlp.com/PS-94Series.htm Ken
  16. K

    Powering a mobile FM transmitter

    Why would you recommend two 12v batteries in parallel as opposed to one 12v battery with the needed AHr rating? Ken
  17. K

    4 players quiz game using relays

    Thanks Chris. I went back and added it. Ken
  18. K

    4 players quiz game using relays

    If you are swaying away from relays, here are some simple SCR based circuits (not mine). I've built several versions of these. Ken Added after the post: http://www.techlib.com/electronics/games.html
  19. K

    4 players quiz game using relays

    Am I missing something? If any player pushes a button, it not only opens the +12V to the other players, but also to their relay. So if the player pushing the button holds it down their relay will just continuously buzz open and closed. ???? (Think Model T Ford ignition spark coil.) Maybe DPDT...
  20. K

    4 players quiz game using relays

    GutoBR, Are all your relays SPDT? Ken
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