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  1. BobK

    Trying to manipulate voltage

    Hmm. Sounds like a good way to make an engine run badly. But if you really want to do this look up op amp summing circuit. Feed the signal into one input and a fixed voltage into the other. Bob
  2. BobK

    Trying to manipulate voltage

    If I undertand you correctly, you want to take a signal that is an AC signal varying in amplitude from 0 to 1V and add some fraction of a volt to it so that a device monitoring it thinks it is above 0.5V when it is acually at a somewhat lower level. Is that what you want? Bob
  3. BobK

    help designing a 24 VAC circuit

    Steve, It might be safe, but you would then be turning on both zones if either one came on. This is not likely what is wanted. Bob
  4. BobK

    Is there something to use to flash 2 led lights quickly?

    But they will not come close to what the OP wants: 1. delay 2 hours 2. blink for 2 seconds 3. off for 2 seconds 4. blink for 2 seconds Doing this with discrete transistors would be quite complex. You couuld possibly do it some one-shots and 555 timers, but the timing would not be...
  5. BobK

    Is there something to use to flash 2 led lights quickly?

    I could do this trivially with a PIC microcontroller, but it is a long learning curve if you are not already competent with them. Bob
  6. BobK

    higher output MOSFET

    I,for one, do not know what a Retro-40 or an HLA300 is, and I am not inclined to google them in order to answer your question. Bob
  7. BobK

    Newbie in need of help-voltage readout LED

    Google "digital panel meter" Bob
  8. BobK

    2.1 Radio project.

    Never mind, I see you already have another thread.
  9. BobK

    3. way Light help

    I showed you how to do it with 2 4-way switches. You could also do it with 2 3-way switches. I don't understand what you are not getting. Bob
  10. BobK

    Fan Caught on Fire in PC, Why Didn't the Fuse Blow?

    :) Bob
  11. BobK

    3. way Light help

    I believe this is what you want. Bob
  12. BobK

    Program a pulsating/reversing

    No, he hasn't, because he is convinced that solenoids are more efficient than motors. Makes me wonder why no one has thought of using solenoids to run electric cars. Think how much farther they could go on the same battery power! Bob
  13. BobK

    Is it possible to detect mosfet failure?

    I did a search on homemade Segway's. One guy who designed and built his own mentioned that he used mosfets with a higher current rating than the battery could supply. That, coupled with the gate protection already proposed should pretty much cover it. Bob
  14. BobK

    Switch Help Please - Do I need something different

    I think it is likely that two of the terminals on the A and B switch ARE connected together. All you have to do is find out which these are and then connect them to the common terminal on you 3 terminal switch. Did you try meauring resistance between them with a multimeter? Bob
  15. BobK

    substitute radio display backlight lamps

    LED + resistor. Bob
  16. BobK

    Switch Help Please - Do I need something different

    What I am saying is that you cannot replace 2 switches with 2 terminals each with one switch with 3 terminals UNLESS one terminal on each of the 2 switches are connected together. Use a multimeter in Ohms or Continuity Test to see if either of the terminals of the 2 switches are connected...
  17. BobK

    50 IR LEDs powered by 9v battery??

    Well, they don't say what kind of 9V battery. Bob
  18. BobK

    Switch Help Please - Do I need something different

    Are you sure that button A and B have a common connection and that it is the one you are tying together for your new switch? Bob
  19. BobK

    LED flashing using 3volts battey

    http://wild-bohemian.com/electronics/flasher.html Bob
  20. BobK

    What did you do???

    Or do what I did, enter the PhD program then quit with a masters after 2 years.:) Bob
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