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  1. MP1

    Led display Digital Voltmeter question

  2. MP1

    Inverter Circuit 12V DC to 230VAC Sine Wave

    steven, you might be pleasantly surprised. I recommend you continue with your project with an open mind. MP
  3. MP1

    3-Axis Stepper Controller

    Did you over heat the UCN chip? You probably need to build one of the other designs if this is the case. MP
  4. MP1

    3-Axis Stepper Controller

    You would compensate for this in the software. MP
  5. MP1

    Inverter Circuit 12V DC to 230VAC Sine Wave

    The transformer that you choose will make quite a difference as to what you get out of this device. I assume the kit gave you a recommendation. You should be sure to get one as good as the recommendation or better. Regarding the 2N3055s, it does not matter which manufacturer as long as the...
  6. MP1

    How can I cascade 4017s?

    Good subject to expand on. Again, if you are only blinking LEDs, it might not matter. The individual resistors in the design from the French website give you a more universal device that is not limited to using the same common for all outputs. Thus, it has the capability of other applications...
  7. MP1

    LCD Voltmeter

    Chris, There are actually two projects by this name in our projects section. I think the project lists the tolerance, but why don't you post a link to the one you are making and then everyone will be able to give you the most accurate advice. Also, have you seen the other longer threads in this...
  8. MP1

    How can I cascade 4017s?

    The carry out will allow you to use multiple 4017s as ones and 10s type of counter. You do not want to use this for a continuous counting sequence. Bill Bowden's circuit does not make a very good tutorial and I would recommend using the AND gates. I would also use gates for the clock instead of...
  9. MP1

    How do I produce this signal? [All Better!]

    Have you made one of the blinky light projects with the 4017? If so, you know that the clock frequency causes each output to fire off in a controlled sequence. Thus, if your clock signal causes each of the LEDs to blink at every 0.5 seconds, you could select the pins you want for a pulse every...
  10. MP1

    Dead accurate 1Hz clock signal???

    The most accurate way to do this is to use a crystal oscillator and a divider circuit. It can also be done accurately with a micro, since you program the timing. This is basically the same as a programmable divider since all functions in the micro are based off the clock cycles of the micro. MP
  11. MP1

    How do I produce this signal? [All Better!]

    If a 5 volt amplitude is desirable, you could use a clock circuit and some logic or clock circuit with 4017s where you choose the output pins that would give you the correct timing. For a more accurate source, you could use a microcontroller. Turn the port pin on, start a 500 millisecond count...
  12. MP1

    How do I produce this signal? [All Better!]

    What is the amplitude? Does it only produce this one set of two square waves or does it repeat this sequence? If it repeats, does it give a defined number of repetitions or is it continuous? MP
  13. MP1

    Inverter Circuit 12V DC to 230VAC Sine Wave

    Steven, It looks like a nice little kit. It is a shame they didn't include the transformer and heat sinks, but it looks like a nice simple kit for those who do not need a lot of power. Where will you use it? Did you purchase the kit for a specific purpose or for learning about inverters? MP
  14. MP1

    pressure sensitive sensors and conductive rubber

    Would something like this work better? http://www.tekscan.com/flexiforce/specs_flexiforce.html Just a thought, since you are re-designing it anyway. MP
  15. MP1

    3-Channel Mixer

    Rory, The project does not go into depth about what type of input signals it can handle. From your description about how you turn it down to almost nothing to get rid of the distortion, is a symptom that you are overloading the mixer with your input signal. You need a different design. What are...
  16. MP1

    LCD help

    There are probably as many different LCD displays as there are models of cars in the world. You will need to find something specific to what you will interface it to. Color, B/W, 1 line, 2 lines, 4 lines, character, graphic, etc.... There are many variables. Depends on what you will interface to...
  17. MP1

    Re: sizing pc board artwork

    Trienbang, Your DIP or SIP packages on this board most likely have their holes on 0.1" centers (2.54mm). It is pretty standard. Print and measure, then tweak on the size if needed. MP
  18. MP1

    LED Timer

    Hi edeca, Sorry for the late reply. Yes, you could use a charge pump circuit to get you the slow signal that you want. There are probably a lot of different ways to do this. One way to do it is to use CMOS switches. Also, some digital gates with capacitors to smooth out the signal would work. A...
  19. MP1

    Wireless (Radio) Headphones

    Linx Technologies makes small RF transmit and receive chips that run on low power. Perhaps you can find something on their website that will be useful in your project. http://linxtechnologies.com/ MP
  20. MP1

    LED Timer

    I am not sure why your simulation fails since I rarely use any of the simulation software packages. However, to answer some of your other questions, the LEDs will each go on and then off as the signal is sent to the next LED when using a 4017. Use of large capacitors on the LED side of the 4017...
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