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  1. BobK

    Phone call causes LOUD screeching noise from unknown location near my apartment building

    I’ll vote for coincidence unless it occurs again the same way. Bob
  2. BobK

    USB Power Supply via a Relay

    No, you don’t need to run the black connection through the relay. Bob
  3. BobK

    Simple SW receiver on 3V?

    That is basically a crystal set with a 1 transistor amp. Bob
  4. BobK

    Please explain this resistance reading

    Look at the second part, the maximum resistance for a short is infinity? I guess I have a short circuit between all of the fingers then, no wonder I am so clumsy at typing. Bob
  5. BobK

    Please explain this resistance reading

    Huh? Bob
  6. BobK

    What is this piece in a cell phone camera?

    More likely UV. Bob
  7. BobK

    How to spec a simple electronic circuit

    It is hard to give advice without knowing what you know. Do you know how to determine the max voltages across and currents through each component in your design? Do you know how to read a darasheet and extract the relevant limits? If I told you there were no voltages above 10V in a circuit...
  8. BobK

    Simple SW receiver on 3V?

    There is no reason a 3V would last longer than a similar sized 9V if outputting the same power. In fact, it might be the opposite unless a class D amp is used. Bob
  9. BobK

    DC 9v replacement

    Based pm what Brookstone stuff costs, I would expect a bridged class D amp. Bob
  10. BobK

    DC 9v replacement

    I would be very surprised if an outdoor speaker produced only 1W of output. You would barely be able to hear it. Bob
  11. BobK

    DC 9v replacement

    1A might not be sufficient. Do the speakers have a power rating? Bob
  12. BobK

    DC 9v replacement

    8 D cells makes 12V. Are you sure the adapter is 9? Bob
  13. BobK

    Attract fish by sound, light or anything else

    It might be easier to repel fish. A loud audio signal might do it. Put concentric rings of transducers around the area you want to attract fish to. Activate the outer ring first, pushing all of the fish toward the center. Then, activate inner more rings in sequence. Then all the fish will...
  14. BobK

    A/D impedance PIC connected to RC circuit

    Show us how it is connected. Bob
  15. BobK

    DRC Error in PCB Design

    You haven’t routed it yet! Bob
  16. BobK

    how to determine the right voltage for led lamp?

    Ah, this finally makes sense. At least I was right before I was wrong! Bob
  17. BobK

    Input power vs Output power in pro amps

    You mean a combination amplifier & toaster oven? Bob
  18. BobK

    how to determine the right voltage for led lamp?

    I don't see how you can light up just 5 of the LEDs on that strip. It looks like there are conductors top and bottom, which would be power and ground, and then 5 LEDs in series between them. If you power any of it, it should be powering all of it. In any case, it cannot be driven by a voltage...
  19. BobK

    Input power vs Output power in pro amps

    If that is the case, the mandated power consumption sticker on the back in incorrect. Bob
  20. BobK

    Input power vs Output power in pro amps

    I can make a device that takes in 175W continuously and outputs 700 Watts RMS for one second out of each 10 seconds. It is actually energy which must be conserved, not power. And energy is power times time. So my device would take in 1750 Joules every 10 seconds and output 700 Joules. Bob
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