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  1. J

    Need help with circuit

    Well the most obvious question I have is... Did you hook up the LED in the correct orientation? Depending on the type of LED you have, with a 9 volt battery, the series resistor might need to be of a lesser value to drive the LED to it's brightest state. You hook the battery up the exact way...
  2. J

    Experienced eyes needed. Finalizing my project.

    I even thought about doing that. Ugh, the time I am supposed to use a diode and I choose to take the harder route. I just appreciate the help. This time I understand clearly what you mean as I had already thought about the diode.
  3. J

    Experienced eyes needed. Finalizing my project.

    Here is where I got that both inputs should never be logic '1'. Which it seems that if both inputs are logic '1' then the system would not work as intended. The output of Q has to be HIGH for the buzzer to sound. http://wearcam.org/ece385/lectureflipflops/flipflops/ Since I have 2 NOR...
  4. J

    Experienced eyes needed. Finalizing my project.

    I thought I knew how RC circuits worked, but after running a simple simulation using an RC circuit I see know that if I connect the cap to the DC power and the resistor to GND, the voltage starts high and ends low. Just what I wanted, even though I don't fully understand it yet, it works...
  5. J

    Experienced eyes needed. Finalizing my project.

    The only way I can see this working is by using an inverter. As the capacitor charges the voltage builds slowly, this seems backwards to the functionality I require. I need the voltage to be high and slowly drop over a short period of time. Am I understanding correctly or is my inexperience...
  6. J

    Experienced eyes needed. Finalizing my project.

    I been trying to understand what you said all day. I want to be able to manually reset the circuit to stop the counting and kill the buzzer. The most logical way to me is to set the reset of the flip-flop high. Why would I want to add in a 10k resistor and remove the pb switch? I see now D1...
  7. J

    Experienced eyes needed. Finalizing my project.

    Need some experienced eyes to look over my complete design and let me know of any major or minor mistakes I have made. Description: This circuit is supposed to be a trip alarm circuit. When the photocell goes dark(R7) the buzzer should sound for a predetermined amount of time and then the...
  8. J

    pushbutton switch

    You can by PB switches at radio shack that are smaller then half inch diameter, But you don't specify any other dimensions. If your looking for a PB that also makes a beep when pressed, I can't think of anything, but that should be simple as hell to make with a few components.
  9. J

    Vcc and v+ and GND

    V+ is the 12 volt input to jp2. VCC is the regulated voltage coming out of the voltage regulator IC3. VCC will be the voltage needed to drive the IC's. GND is just that. JP2 is just where you would connect your power lines to the circuit board. It also contains what looks like 2 outputs, the...
  10. J

    1.2KW Switch Mode Power Suppl

    I don't get it, anyone want to explain what is so important and why anyone would want to use an smps?
  11. J

    Multisim simulation help

    I did not explain what I was trying to do here. But a lot of this is because I am having multiple issues, some with the design of the circuit itself and some with the simulation software. which is in part up to the fact that I have no idea where I am going with this since it is my first and only...
  12. J

    Multisim simulation help

    Ok, so now that we on the same page again. LOL I got to thinking about your comments on using the LDR as a reset. It made a lot of sense to me and I think I have come up with a better plan then I had before. Instead of holding the MR high, why not just let it oscillate. Now I am using an LM339...
  13. J

    Multisim simulation help

    I am using the photocell to 'trip' the circuit. In other words, say the photocells resistance is in a state of low resistance. This is what I will consider the stable state of the circuit, it's waiting for something to do. Now if I was to 'trip' the photocell into becoming a high resistance for...
  14. J

    Multisim simulation help

    Uhm, your totally right and I should have known better. I read about this before and should have been more aware of what I was doing. Learn from my mistakes. No, I don't even know what an optocoupler is. I will be looking into it. In my schematic R7 will be a photocell, so it is very unlikely...
  15. J

    Multisim simulation help

    I'm an idiot. Let me work on this a little more and see where I end up. I'll get back to you :D I'll post the schematic again so anyone looking on can see where I am going wrong and hopefully improve my design.
  16. J

    Multisim simulation help

    I got another question for you as well. I am looking for a DPDT relay to use for my simulation. There is no model in multisim that works as a DPDT relay. So when searching google I came upon this thread here http://forums.ni.com/ni/board/message?board.id=370&thread.id=2983 I used the energized...
  17. J

    Multisim simulation help

    Nick, if you don't mind I am gonna need to pick your brain again. This is really starting to confuse the hell out of me. I did as you asked and read the datasheet this time, but I don't see where it helped me out in this situation. Maybe I am missing something simple and hopefully you can...
  18. J

    Multisim simulation help

    I was curious if that was the situation, I just hadn't had time to test it out myself. Thanks for doing the leg work for me. :) Now, since this is a simulation I can safely assume I do not need to connect all the outputs in RL for this 4060 to work? Simulations can really be a godsend when you...
  19. J

    Multisim simulation help

    Ok. well so far so good. But like always there is more to the story... Did you also try connecting anything, whether it be another component or even a frequency counter/oscilloscope to anyone of the 4060 outputs? As soon as I do that the oscillation stops again.
  20. J

    Multisim simulation help

    http://omploader.org/vNGVrOQ/gamertimer_a.ms10 Here is a link to another schematic I found using a 4060. This is where I got the idea to use the switch at. If you use a oscilloscope and attach it to the RC network, it will produce a square wave right from the beginning. This is where I am...
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