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  1. MP1

    PIC 16F877 PROGRAMMING IN C

    You should post this in the microcontroller area. Many users do not read the "General" posts. You are not getting much exposure by posting a micro question in the wrong forum. MP
  2. MP1

    Switching polarity of motor

    I am assuming that if this is your Master Thesis, you have had experience programming microcontrollers in the course? Seems like micro and SSR would be pretty simple. Pin 1 high, pin 2 low...wait 3 minutes, pin 1 low, pin 2 high...wait X number of minutes, do whatever else you want. MP
  3. MP1

    Something about Digital to Analog Converter

    You never have to live with the wrong output when you are designing the circuit yourself. First, you should check to see if this is just circuit noise. Did you use bypass capacitors and all recommendations to keep noise out of the circuit? What do you get when you test other voltages as well? If...
  4. MP1

    Adapting a 220V transformer to 240V?

    Zeppelin, If you check the manufacturer site for your transformer, you will most likely find the transformer is tested well above the 220 or 240 voltage of the mains. It should work perfectly fine. The difference you will see is that the output is also different since the primary to secondary...
  5. MP1

    MOVED: simulating circuits with ICs in orcad

    This topic has been moved to Spice Simulation - PCB design. http://www.electronics-lab.com/forum/index.php?topic=5358.0
  6. MP1

    DO NOT POST HERE UNLESS IT IS ABOUT A PROJECT IN OUR PROJECT SECTION

    This area is for posting questions about projects in our projects section. It is NOT a general discussion of "Projects" in general. If you have a general question, post it in the correct forum area. IF YOU POST IN THE WRONG PLACE, IT COULD BE DELETED. MP
  7. MP1

    help about this supply

    The use of a center tapped transformer and two diodes provides less ripple. A needed feature when you regulate the supply in this manner. The circuit in your link with two diodes is a full wave rectifier. Using a non center tapped transformer with one leg to common and the other leg to a...
  8. MP1

    500W_inveter

    I forgot to answer your original question. You are using the Divider output, which is Pin #1 on the MM5369. It is only used as a 60 hz square wave generator at this point. MP
  9. MP1

    500W_inveter

    Partminer has 1274 in stock. There are also others, but I use partminer because they save me a lot of search time. There is also a drop in replacement. You can e-mail this guy: [email protected] to find out what it is since he has already gone through this search process, or you can...
  10. MP1

    500W_inveter

    Perhaps you can send ante a private message to ask for a link to the original website. I could not find the original post. Probably because it was a long time ago. What I posted is all the information that I have on this one. MP
  11. MP1

    Question about Ground Loops

    Hmmm....it is done all the time to fix sensors, dataloggers, etc. I know you are not familiar with the meteorological area, but you might want to read up on this before making such a comment. MP
  12. MP1

    500W_inveter

    Here is also a publication on a modified sine wave inverter: MP 2000-5000W_Modified_Sine_Inverter.pdf
  13. MP1

    500W_inveter

    Here is one that ante shared with the group a few years ago: MP
  14. MP1

    MOVED: voltage regulators

    This topic has been moved to Theory articles. http://www.electronics-lab.com/forum/index.php?topic=5314.0
  15. MP1

    RS232 to keyboard converter

    Personally, I think you are going in a large circle. If you are reading the code in the Terminal of the second PC, then you do not need hardware to do something with it. You only need to know how to write your code in a way that PC #2 will do something with this input as if you pressed a key on...
  16. MP1

    Alarm sound detector schematic

    kjoephi, Why not use a parametric filter with a very narrow passband / High Q? You cannot achieve a very narrow pass band otherwise. Bandwidth and Q are inverse of each other. MP
  17. MP1

    Keys Finder

    I suppose we will know how it works when someone builds it.  ;) Not much point in starting a topic on a guess. (actually, topics based on guess or theory will be moved to chit chat or theory section). MP
  18. MP1

    Frost Alarm

    The thermistor is a device which changes resistance with varying temperature. Thus, the thermistor and 100K pot provide a voltage divider to the comparator circuit, which triggers at the voltage level adjusted with the pot. If you want to disable the alarm, a switch which allows for a fixed...
  19. MP1

    500W_inveter

    Although others on the group have made positive comments regarding the use of square wave inverters with TV, I would never run a Television from a square wave inverter. At the very least, I would use a modified sine wave inverter and preferably, a sine wave inverter. Most alternate energy site...
  20. MP1

    Variable DC Power Supply

    Actually, you do not need a zener. This is a very typical circuit for voltage regulation. Using a zener would be better, but you can use this circuit, trimmed to the voltage you want and then leave it alone. Believe it or not, there are a lot of places in the world where zeners, voltage...
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