Search results

Search Forums New Posts
  1. BobK

    Relay configure trouble

    Just wire the 12V in to the motor. Latching does you no good since you have no power once the 12V in is lost. Bob
  2. BobK

    Noob with a very simple LED question

    Read this: https://www.electronicspoint.com/got-question-driving-leds-t256849.html Bob
  3. BobK

    EMF Sensing

    Oh my god, your breaker panel is infested with ghosts! Bob
  4. BobK

    EMF Sensing

    The frequency you are hearing is likely 50 or 60 Hz, depending on where you live. Bob
  5. BobK

    Relay configure trouble

    If all the relay does is connect the same input voltage that drives the coil, what is the purpose of the relay? Bob
  6. BobK

    FET switching for 24V

    You could also use a 12V zener from gate to ground. Bob
  7. BobK

    Amplitude and Frequency

    Because you were thinking of radio waves? At audio frequencies they are huge. Bob
  8. BobK

    What is wrong with my LED circuit.

    There is nothing wrong with an LED driver when used correctly. You are using in incorrectly. A constant current driver works with a single string of LEDs because the current must go through each LED in that string. As soon as you put two strings in parallell, there is no guarantee that the...
  9. BobK

    Electromagnet and Switch

    Since that magnet is intended for lifting, I will guess that the force that they state is the max that it will lift when applied to a flat magnetic surface large enough to cover the surface of the magnet. Bob
  10. BobK

    two questions

    1. The forward voltages will add up and the drop across the resistors will add up. One resistor is all that is needed even if you have more than 1 LED. 2. It does not matter which side of the LED the resistor goes. Read this...
  11. BobK

    Removing a passive crossover from an amp

    +1 The crossover you are talking about is an active one since it needs power. If you bypass the crossover you will be feeding a lot of extra energy to the other speakers that they are not intended to handle. At best, this will cause distortion, at worst blow out the speakers and possibly...
  12. BobK

    mobile stereo

    Uninterruptable Power Supply. Bob
  13. BobK

    Amplitude and Frequency

    If you are going to do this, wear ear and eye protection. Bob
  14. BobK

    Audible transmission through armatures?

    It is not imagination, it is not voices made up in our heads. It is our brain interpreting bits of noise as bits of voices. The same "radio" voices seems to be the common description of people who experience this. The similarity of the experience is because our brains work the same way. I...
  15. BobK

    Amplitude and Frequency

    We know what resonators and oscillators are. What we don't know is what you think you are going to do with them. Bob
  16. BobK

    Audible transmission through armatures?

    Actually, there is a more likely explanation. Our brains are highly trained to pick out voices from noise. This function sometimes kicks in even when there are not voices present. I experience this myself with my ceiling fan sometimes. It sounds to me like a radio that is being swept through...
  17. BobK

    Delay-off switching of a 115v 2amp load

    A transistor is not good for controlling AC loads, you would want a relay, either electromechanical or solid state. An NE555 timer chip could do the 60 second delay. Originally you said a 2A load, and now it is a compressor that uses 9A. Which is it? Bob
  18. BobK

    Light detection

    Is the person carrying the flash light? How accurate should the boundaries of the area be? Are you talking about whole room or a specific area in a larger open space? Sounds like a good Halloween haunted house project, but I think you are little late for this year. Bob
  19. BobK

    Car sound system conversion to home use.

    Car audio equipment manufacturers are notorious for over stating their power specs. You may find that your 340 Watt sub-woofer amplifier outputs nothing near that at the volume you are listening to. If you could separate the subwoofer from the other amps, using two different power...
  20. BobK

    New here, need to find a momentary keyswitch

    LMGTFY Which turns up this: http://www.amazon.com/Position-Single-Momentary-On-Off-Momentary-Keylock/dp/B001PNMC3O Is that what you were looking for? Bob
Top