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  1. crutschow

    Temporary Delay Circuit

    It would appear that there is a hidden load on one of the OR gate outputs. Either that, or you have a bad OR gate chip.
  2. crutschow

    Temporary Delay Circuit

    Don't see a reason for the overheating unless you were applying more than 5V for power or to any of the inputs, or had any of the outputs grounded or going to 5V. An exact schematic of all the gate connections (including unused gates, and power and ground) would help, as we seem to be missing...
  3. crutschow

    Temporary Delay Circuit

    I'll ask again. What OR gate are you using?
  4. crutschow

    Astable multivibrator circuit making me astable

    Great. It will step to 0, so you don't need to use 0.0001 (unless you want to). So why are they culling Cape Town's baboons (I assume you mean the animal, not some idiot humans)?
  5. crutschow

    Astable multivibrator circuit making me astable

    Great. In case you are not aware, you can change/step the wiper value as desired, to move the wiper from one end of the pot resistance to the other.
  6. crutschow

    Temporary Delay Circuit

    Why? What OR gate were you using with what voltages? If everything was 5V, the gate should not overheat. Are all the unused gate inputs grounded?
  7. crutschow

    Astable multivibrator circuit making me astable

    Attached below: I had to add the .txt suffix so I could attach the files here, so remove that when you put them in the folders. The .asy file goes in the \sym folder, and the .sub file goes in the \sub folder.
  8. crutschow

    Astable multivibrator circuit making me astable

    Apparently LTspice does not like potmax/10 as part of the .step command. If you want a 3-terminal potentiometer model, I can download the one I have.
  9. crutschow

    Difficulty finding the appropriate resistor with power calculation

    The resistor voltage that determines its current and power is the voltage across the resistor, not the voltage at one terminal. So if there were 5V connected to both terminals, than obviously there would be no current and no power dissipated.
  10. crutschow

    Difficulty finding the appropriate resistor with power calculation

    Is there actually the full 15V across the resistor or is one end connected to 15V and the other end connected to some other circuit components? What does the resistor do?
  11. crutschow

    Power Supply Clarification

    No, you did not connect it as I stated. Read that more carefully. There is an electrical contact connection between pins 2 and 3, not 1 and 2.
  12. crutschow

    Power Supply Clarification

    You can do it with a mechanical interlock if you use a Jack with three-terminal connections, such as below: The contact between pin 2 and 3 is normally closed, but is mechanically opened when a Plug it placed into the Jack. The Jack's power supply circuit common is pin 2, and the Connector's...
  13. crutschow

    Wireless speakers

    What music source do you play through the receiver?
  14. crutschow

    Wireless speakers

    The speakers, of course, need power. Is that available on the patio where you want the speakers? If so, you might use a Bluetooth amplifier at the speakers, but don't know how well they will work at 100 feet.
  15. crutschow

    Simple transformers: how do they adjust to different input voltages (100V-240V)

    That's not a transformer by itself, it's a switching regulator circuit, which can be designed to work from a large range of input voltages. It uses a rectifier bridge to convert the AC to DC, and then uses a switching regulator, which operates at a high frequency to allow the use of a small...
  16. crutschow

    What gauge of power and speaker wire?

    How did you get 12W? That datasheet says it has 90% efficiency.
  17. crutschow

    Combining multiple power sources

    Why the resistors? I see no purpose for them in this setup unless you need to limit the output current of the sources.
  18. crutschow

    cfi chirps every 50 seconds..

    Even with good hearing it's hard to determine the location of a short beep that only occurs once every 50 seconds. I know that it has sometimes taken me an hour or more to pin down the location of a beeping smoke detector with a low battery. If someone could invent a cheap device that would...
  19. crutschow

    Grounding a Ham Antenna

    To the bottom of the antenna mast.
  20. crutschow

    What gauge of power and speaker wire?

    I think we have a language problem here. Afraid I don't really understand any of that. What are "speakers under pressure", "opposite of "tight"", and "reproduce bass inherently"?
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