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  1. MP1

    Counter

    You might have to look at the data sheets for the parts and simulate what is actually in the individual chip packages for FPGA programming in this development package. I am not familiar with it. Perhaps another member of the forum also uses this package. You might also try a post in the...
  2. MP1

    Counter

    I am not familiar with your program, but you should look for 4511, 4518 and 4060 chips. Forget the MC1. You won't see that in your list. Does that help? MP
  3. MP1

    Counter

    Joe, Here is a circuit for a 0 to 60 second stop watch. This should work for your purpose. It has "hold" and "reset". MP
  4. MP1

    Controlling a Relay via an LED Circuit

    One thing to keep in mind if you are adding the opto coupler in series with the existing LED is that the opto coupler has a LED in it which is going to drop your voltage and change the available current to both devices. When calculating current in a circuit with an LED, you always subtract the...
  5. MP1

    Multiple grounds

    It is not a good board layout practice to use a board layer for this purpose. MP
  6. MP1

    Eagle Manual

    Gogo, Good find! The older versions did not have a manual. For those browsing the Eaglesoft website, it is on the page with the program downloads. You have to keep scrolling down to find it. Here it is. I noticed there is now a tutorial on the same page. Note: I have also moved this topic from...
  7. MP1

    Multiple grounds

    For best results, you would treat all three as 3 separate circuits and then tie them all together at a single point at the chassis. Otherwise, you could have interference between you analog and digital circuitry. MP
  8. MP1

    Controlling a Relay via an LED Circuit

    There would be many ways to do this. Some require tearing into the circuit and making some measurements and some do not. Do you still need to see the LED? If not, you could install a LDR on it and use the LDR as part of a voltage divider to turn on a relay. This would probably be the easiest...
  9. MP1

    Eagle Manual

    I don't think Eagle has a manual. Here are links to some tutorials: http://www.interq.or.jp/japan/se-inoue/e_eagle.htm http://www.precma.com/informatica/tutorial.htm MP
  10. MP1

    Balanced Power Transformer

    Think of the windings as resistors. With power turned off, you measured two sets with the same ohm readings, right? These most likely each have a red and a black wire. Mark them as secondary red A and secondary Black A for the one set and secondary red B and secondary black B for the other set...
  11. MP1

    Convert 6VAC to 12VDC ?

    Cavalier, Since you have AC voltage, why not use capacitors and diodes to make a voltage double. Then you can rectify and regulate the voltage from there. The drawback, of course, is that you lose current with a voltage doubler. However, this might not be a problem since the voltage is coming...
  12. MP1

    Balanced Power Transformer

    David, with no electric connected to the transformer, use an ohmmeter to determine which wires are going to the two individual secondary windings. You have two windings, which you hope are the same. You should have two combinations that give you the same or very close to the same ohm reading...
  13. MP1

    Help On my mini dummy

    What is the tolerance spec on your capacitors? If you use a cap with 10% tolerance, it would be normal to see 70 pf from a 63 pf cap. If you use a 20% tolerance cap you could see worse. You need to find 1% tolerance capacitors to make this work properly. Then follow good grounding guidelines...
  14. MP1

    3-Axis Stepper Controller

    What are you looking for? The pdf file was a pretty good sized schematic with multiple axis. If you still need more schematics, list some specifics and we can go from there. MP
  15. MP1

    5ohm 20watt resistor

    Looks like you forgot to 1/x your sum. I am assuming you used the parallel formula and came up with 1/50+1/50+1/50....etc and came up with a sum of 0.2. Answer is actually 1/x, thus 1/0.2 = 5. Correct answer is 5. MP
  16. MP1

    Frequency Division

    Joe, If you have some experience with microcontrollers, you can do this pretty easily. Count the pulses coming in and send a pulse out another pin after every so many counts. As long as you use a micro with a faster clock than 4 Mhz, it will work fine. This is on the same lines as what...
  17. MP1

    3-Axis Stepper Controller

    Here is another... MP
  18. MP1

    3-Axis Stepper Controller

    You would use different components. I have attached one example. There are many ways to control steppers. MP L297-L298-3axis.pdf
  19. MP1

    Build your own printer cable LCD Display

    According to the author's site for the software LCD Smartie, he has added 4X20 support to this program in his latest version. Connections to the LCD are always the same, so it looks like it is a matter of downloading the latest software. Follow the links from the project to the author's site and...
  20. MP1

    High Power LED Mood Lamp

    Your traces are plenty big enough for this. MP
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