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Type: Posts; User: SparkyChem

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  1. Closed: Does it exist an AC to AC converter in small package for converting 220v to 110v?

    Hello. I have an appliance that id like to install on the wall on my bedroom. Its a broan exhaust fan. The unit only operates using 110v and my system provides 220v. I have been looking for ways to...
  2. Closed: Re: Can LM3914 be set up to work as an exclamation point and alarm flasher?

    Thanks for the clarification. I re-read the #2 post from where you used ohm's law. As mentioned I thought that this was not recommended to get an "exact result". But it looks that a raw estimation is...
  3. Closed: Re: Can LM3914 be set up to work as an exclamation point and alarm flasher?

    Okay. Understood about h_fe and the "rule of thumb" you mentioned, it looks that I have to review some of the basics that you have said, personally I thought it could be analyzed by mere circuit...
  4. Closed: Re: Can LM3914 be set up to work as an exclamation point and alarm flasher?

    Alright by re adjusting the above equations it would become into:


    https://i.imgur.com/3IToxOF.png

    Not sure why i_base=I_collector/10 ? Does it mean that the gain is just 10?. If so why?. I'm...
  5. Closed: Re: Can LM3914 be set up to work as an exclamation point and alarm flasher?

    Supposing that the transistor that I intent to use is a 2N3904 looking at the datasheet mentions, (see 2N3904 ) the collector current is 200 mA. Therefore by doing some circuit analysis (see figure...
  6. Closed: Can LM3914 be set up to work as an exclamation point and alarm flasher?

    As the title implies I'm trying to make LM3914 to work as an exclamation point and alarm flasher. There is already a set up how to achieve both individually in the documentation from the LED bar...
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    Closed: Re: What happened to Latex on this forum?

    Thankfuly it seems that my complain was not something out of the blue. But as of today this problem has not been resolved which can be problematic when trying to point out some equation.

    I am...
  8. Closed: Casio BASIC programming question is it possible to solve this trigonometric equation?

    Has anybody here some experience with CASIO BASIC or the programming language which is used on Casio calculators?. I own a Casio cfx 9860 and I'd like to build a program to solve the equation from...
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    Closed: What happened to Latex on this forum?

    I am trying to use Latex on this forum to post an equation with trigonometric formulas but instead I got an icon showing elektroda.pl has it been deactivated or something?. I'd like to get some help...
  10. [PIC]Closed: Re: How do i perform multiple tasks in mikrobasic for PIC12 series?

    I have participated in many other forums and nobody complained about the way how I used and abided their rules and etiquette. Has my method of replying offended or not to your liking?. If this is the...
  11. [PIC]Closed: Re: How do i perform multiple tasks in mikrobasic for PIC12 series?

    The program functions as stated but the LED doesn't blink. It is odd because you don't seem to have changed that part in the code. Can you take a look into that?.

    By the way. How do you add these...
  12. [PIC]Closed: Re: How do i perform multiple tasks in mikrobasic for PIC12 series?

    So in short does it mean that if you add too many interrupts this causes the PIC to reset itself because of the WDT thing?. But when you need to perform too many tasks what other ways are to resort?....
  13. [PIC]Closed: Re: How do i perform multiple tasks in mikrobasic for PIC12 series?

    Hi. Thanks for your response. I tried to run the simulation in my computer but the LED did not blink with the code in mikrobasic. The mikroC code it seems correct but the other one is not right. I...
  14. [PIC]Closed: Re: How do i perform multiple tasks in mikrobasic for PIC12 series?

    Shouldn't that be PIC12F in my case??. Either way, why 500ms?. Can you show me an example of how do i use it with the ADC and UART codes you mentioned?. I am still learning.
  15. [PIC]Closed: How do i perform multiple tasks in mikrobasic for PIC12 series?

    I am trying to make a simple project in mikrobasic using PIC12F1840. This includes to toggle on and off a led in Port RA0 at a frequency of 1Hz (led blinking), at the same time recording ADC values...
  16. Closed: Re: How to convert a continuous signal into a square pulse?

    I dont need a true bipolar AC, i just need a square pulse. High-low-high-low, this kind, as you said a pulsed DC 5V. What should i do?.



    There is a separate power for that. By no means the...
  17. Closed: How to convert a continuous signal into a square pulse?

    I think it should not be hard to answer this but i tried different methods, like using astable multivibrator but i am not sure if this is the right approach. Is there any easy way to do this?. The...
  18. Closed: Re: Pulse stretcher using CMOS 4000 series for detecting data for MAX232 in serial co

    Okay understood, maybe i'm asking too much, but can you post a circuit to accompany your explanation?. Just to be sure my interpretation is not different from yours. i'm thinking to use a 4011.

    I...
  19. Closed: Re: Pulse stretcher using CMOS 4000 series for detecting data for MAX232 in serial co

    The circuit you proposed it does work, i'm not objecting that. The problem is that when i tried to use it, it didn't worked the way i thought it would.

    Let me explain, when i originally posted...
  20. Closed: Re: Pulse stretcher using CMOS 4000 series for detecting data for MAX232 in serial co

    By doing the method you mentioned would need to add an op amp and a transistor. Can you make the simulation?. Again, i think that the key in this circuit is to lower the train pulse from a 48 kHz...
  21. Closed: Re: Pulse stretcher using CMOS 4000 series for detecting data for MAX232 in serial co

    I just realized that for serial port (232) working at 9600 baud, 8 data bits, no parity and 1-stop bit which is where i intend to use this circuit would be an equivalent to 4800 Hz. In order for the...
  22. Closed: Re: Pulse stretcher using CMOS 4000 series for detecting data for MAX232 in serial co

    Thanks it was very illustrative. This circuit works as mentioned but the problem i have with it although does indeed stretch the pulse, it causes the LED to stay lit all the time. Not surprisingly as...
  23. Closed: Re: Pulse stretcher using CMOS 4000 series for detecting data for MAX232 in serial co

    Yes i tried the schematic in simulation and it works but i dont get why do you left ctl pin unconnected. Shouldn't be connected to a 0.01 uF capacitor?.

    Although i appreciate your efforts for...
  24. Closed: Re: Pulse stretcher using CMOS 4000 series for detecting data for MAX232 in serial co

    I also noted that using a 555 timer could do that work, but i note that there is a volatge drop to 3.3v in the output, would this happen with the method you posted earlier? i mean the diode plus the...
  25. Closed: Re: Pulse stretcher using CMOS 4000 series for detecting data for MAX232 in serial co

    From what i understood i can try using a monostable multivibrator. Would this kind of circuit work?.

    http://i.imgur.com/PIT1msW.png

    i can try it as i have a CD4049 at hand, but my major...
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