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  1. 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?
  2. 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.
  3. 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.
  4. 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.
  5. 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?
  6. 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.
  7. 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...
  8. crutschow

    Wireless speakers

    What music source do you play through the receiver?
  9. 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.
  10. 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...
  11. crutschow

    What gauge of power and speaker wire?

    How did you get 12W? That datasheet says it has 90% efficiency.
  12. 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.
  13. 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...
  14. crutschow

    Grounding a Ham Antenna

    To the bottom of the antenna mast.
  15. 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"?
  16. crutschow

    Audio . . . Delay? Buffer?

    I believe the video processing time is slower than the audio processing, so it's the audio that requires a delay My audio receiver has an audio delay that I set to about 30ms to synchronize my sound and video. I used a video and sound of striking a golf ball to set the delay. You might try a...
  17. crutschow

    What gauge of power and speaker wire?

    Typically you want the wire resistance to be a small percentage of the speaker impedance so it depends upon that and the length of wire. For example 20ga copper wire has a resistance of about 33mΩ per meter, so 3.5 meters of dual speaker wire would have about 7 * 33mΩ = 0.23Ω resistance, which...
  18. crutschow

    Astable multivibrator circuit making me astable

    Some tips: If you look at the Edit drop-down menu you will see the key shortcuts for common components, such as "G" for ground, "R" for resistor, "C" for capacitor, etc., and common commands such as F3 for Draw Wire, F4 for Label Net, etc. which save a lot of time when generating a schematic...
  19. crutschow

    Grounding a Ham Antenna

    The antenna looks like a nice, tall, ungrounded lightening rod, so no, it will not protect the antenna. If the lightening can travel several thousand feet from a cloud to your house, then it will have no problem also going a few extra tens of feet from the base of the antenna to ground. :eek:
  20. crutschow

    Astable multivibrator circuit making me astable

    Increase the value of R2 and R3 as I suggested (below): With the low resistor values and the higher gain of the normally oriented transistors, both transistors just tend to stay fully on. The oscillation frequency is lower, so you also have to increase the simulation time. You can also be able...
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