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  1. K

    need help to build a timing gate

    I've hacked digital stopwatches for that kind of timer. What are the inputs for Start and Stop? Ken
  2. K

    Underwater Beacon and Reciever

    A GPS receiver in a sealed bag?...but then you would have to hold it out of the water every so often. Sorry...just of the top of my head. Ken
  3. K

    AC Power Adapter Use

    If the voltage of the adapter matches the voltage of the device, the device will draw only as much current as it needs. The 1 Amp on the adapter is the maximum current that it can safely provide. However...if the adapter is not the "regulated" type, the voltage will be about 1.4 times higher...
  4. K

    ground fault detector

    My guess is that yes it might be possible. But with the complexity of the system, and not knowing the actual electronics connected to the wires, I would be reluctant to start permanently attaching things. Lets wait and see what Honeywell has to offer. Ken
  5. K

    ground fault detector

    After looking at the documentation, I think getting input from the company's tech support would my first approach. Especially since any modification (added, untested monitoring circuity) to a life safety system could have big legal ramifications. Ken
  6. K

    ground fault detector

    Any chance you have more information on the system...schematics?...links? Ken
  7. K

    ground fault detector

    What happens when there's an alarm? Does the 3VDC level change, or are these actually lines that carry both power and data from intelligent sensors? Ken
  8. K

    ground fault detector

    how many lines do you need to monitor? Are the lines active (have DC or AC voltages on them) or are dry-switch connections? Ken
  9. K

    ground fault detector

    Not knowing the sensors or control panels, it seems as if an Ohmmeter would be the easiest way. Measuring the resistance between each wire and ground...best when you are getting a ground fault indication. Ken
  10. K

    Help with Relay Circuit, Momentary Switch

    If you're stuck with the OEM momentary switch, you could try this circuit: http://www.oldradio.com/current/pushon-pushoff.htm I've used it. Ken
  11. K

    Encoder for speed measurement

    Google: tachometer circuit Google: frequency to voltage converter circuit Ken
  12. K

    Auto A-B Switch

    OK, another approach. Use this "current sensing" switch around one power wire of pump A. http://electronicaircleaners.com/aprilaire-51.aspx. Replace the outlet in the diagram with the coil of relay that I suggested. Connect the common contact of the relay to 120vac hot and the NC contact to...
  13. K

    Auto A-B Switch

    That may make this not so simple a solution. Ken
  14. K

    Auto A-B Switch

    You need to be able to connect two wires from the relay coil terminals directly across sump pump A's motor terminals. Is that possible? Ken
  15. K

    Auto A-B Switch

    An appropriate relay: http://www.radioshack.com/product/index.jsp?productId=2049721 Matching socket with screw terminals: http://www.radioshack.com/product/index.jsp?productId=12505682 Socket layout: http://www.nteinc.com/relay_web/R95Series/pdf/assy_07.pdf Can you figure it out from there...
  16. K

    Auto A-B Switch

    You probably can. What are the voltage and current/HP specs on pump motors? Or a link? Ken
  17. K

    Auto A-B Switch

    Use a relay with it's coil in parallel with pump A. Wire the common and normally-closed in series with the power to pump B. If A is running, the relay is activated, the normally-closed contact is open, and no power can be supplied to B. If A is not running, the relay is not activated, the...
  18. K

    lottery wheel

    I don't think there is a schematic out there that would meet your requirements. It would require someone to go through the whole process of designing, simulating or building, drawing a schematic, and posting it here. Not likely to happen...creating a complex circuit operations using old...
  19. K

    lottery wheel

    I think you're going to need a microcontroller with at least 10 outputs to achieve that complexity. I might recommend a PICAXE 20M2 or 20X2. They are ~$10 each. The programming is in BASIC. The software is free. You only need a PC with a serial port, a home-made 3-wire serial cable, 2 resistors...
  20. K

    lottery wheel

    Google: electronic roulette wheel circuit Ken
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