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  1. MP1

    Circuit You've Ever Made?

    John, Did you mis-type the circuit description? 60 HZ is 60 cycles per second. Divide by 10 still leaves 6 cycles per second. MP
  2. MP1

    555 timer in astable mode

    post a schematic of your astable or a description of the values used and where they are connected to the 555. Also, what is connected to the output? You might be loading it down. Check your signal directly at the output of the 555 with nothing connected to see if you have the correct signal. If...
  3. MP1

    3-Axis Stepper Controller

    Alberto, this would make a cnc if you already have these parts and choose to add the steppers and controller. But if you do not already have these parts, I think you would spend more money for these than just building a unit from the ground up. As greekpic has stated, side play is a very...
  4. MP1

    part replacement

    I have seen both in commercial audio devices. I have also used the 1458 successfully in a large number of my own audio designs. It depends upon how you use them and how you incorporate them into your design. Filtering and shielding are key elements. Good board layout is also a place where many...
  5. MP1

    turnign an led on using ic

    I do not have a data sheet on the chip you are using, but if it has XOR gates in it, this is the truth table. MP
  6. MP1

    How to get low level from high (audio)

    Good post, John. This gives stuee several choices to choose from. Hopefully, this will give him a start. MP
  7. MP1

    voltmeter with more accuracy

    Sharath, The hot wire method is a long proven design. I am surprised you are building one from scratch. You will get much better sensitivity with this setup than you will using transistors. The hot wire method is also a standard in the meteorological industry and air quality measurement...
  8. MP1

    Stepper Motor Circuit

    Have you looked in the projects section? There is a link at the top of the page to go to the projects on this site. You will find one there. MP
  9. MP1

    MPA and CPA

    Are there markings on the other side of the chip? MP
  10. MP1

    solid state toggle switch

    Piezo switch is a bounceless type of switch with no moving parts. Here is an excerpt from one of the manufacturers of this switch type: **Unlike an electromechanical switch that has moving contacts and other parts that will eventually wear out, as well as suffer the life shortening effects of...
  11. MP1

    3-Axis Stepper Controller

    You should have no problem with the non polarized. I normally use tantalums for this value. I keep quite a stock of them for micros. The larger caps should be polarized ones, though. There is a cad program out there called DanCad. It might be what you are looking for. I wrote my own but it does...
  12. MP1

    How to get low level from high (audio)

    stuee, I do not know the specs of your headphone setup, but here is an article that might interest you: http://www.epanorama.net/circuits/speaker_to_line.html Hope it is helpful to you. MP
  13. MP1

    3-Axis Stepper Controller

    If I am looking at the same schematic as you, then C2 is a 10 microfarad and C3 is a 0.01. These are by-pass caps to keep the DC voltage smooth. I recommend that you use the better caps (and the correct values). The only problem you will have if you do not is a little noise in your circuit...
  14. MP1

    ic uln2003 become very hot

    abuaya, It is normal for this IC to run hot. However, if you are exceeding the specs for current which can be found on the data sheet, then you should design your circuit with a different IC or add transistors in the circuit. MP
  15. MP1

    Ultrasonic transducers free samples?

    http://www.hexamite.com/heusline.htm http://www.irl.cri.nz/mat-tech-group/project-area-profiles/ultrasonic-transducer.html http://www.irl.cri.nz/mat-tech-group/project-area-profiles/ultrasonic-transducer.html...
  16. MP1

    KVM switch circuit / Multi-pole double throw switch

    A "make-before-break" connection will do this. In other words, you will cause the old connection to stay connected for a few ms after the new connection is made. Thus, the computer does not lose a signal from the device. MP
  17. MP1

    inverter

    It is simply a language barrier. The use of e-mail is popular so that they can translate the message easier. English is obviously not their main language. You wanted a link? It is here: http://www.163.com/ MP
  18. MP1

    Ultrasonic transducers free samples?

    Most manufacturers will send out 1 or 2 free samples if you give them a business name and address. MP
  19. MP1

    TRIAC question

    Look here: http://www.uoguelph.ca/~antoon/gadgets/scrtest.html BTW: your question is not stupid. Welcome to the forum. MP
  20. MP1

    Mysterious Resistor?

    Good, the person who posted went back and corrected. The post had Cx earlier. I guess this was supposed to be Rx instead. BTW- when refering to all op-amp circuits, I had in mind audio circuits, since this was the subject matter. I did not make myself clear and left out the word audio. It is...
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