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  1. hubble

    stepper motor output waveform

    I have a small 12v 200 steps stepper motor. I am using it for generating an emf. What is its output emf waveform with respect to time? Is it sinusoidal or some other waveform? Also, is the waveform related to number of steps? Thanks.
  2. hubble

    Supercap charging

    Thanks for your quick replies. How do I select the bridge rectifier and buck converter? I think the emf generated by the generator would be under 50v with the current carrying capacity of a few mAmps(I plan to use bipolar stepper motor instead of axial flux generator). I think the output of the...
  3. hubble

    Supercap charging

    Hi,         Is it fairly safe to charge a fully discharged 2.7v supercapacitor from an alternating voltage source of more than its rated voltage? I plan to design a circuit to charge the one using yet-to-be-designed pull string type axial flux type generator. Thanks in advance. 
  4. hubble

    Transformer data

    Thanks Hero999. I am going to try measuring the DC resistance and find which secondary has the highest current carrying capacity. Thanks again.
  5. hubble

    Transformer data

    Thanks Hero999. Can you tell me where I can find these types of transformers? This transformer is used in a control card of a weaving machine. Also, is there a way to know which pins correspond to which secondary? I mean which secondary is rated to which current? All I know about this...
  6. hubble

    Transformer data

    Hi, I have an image of the transformer and I need to understand the data written on it. It seems to have three secondary windings. Here is the photo: What does this S1+S2=15V? Is the 15V shared between these two windings or is it the voltage rating for an individual winding? Is it same for...
  7. hubble

    12V battery charger circuit design help

    Thanks Arun for your time. I have already implemented over current protection circuit but I am going to use regulator circuit as well. Thanks.
  8. hubble

    12V battery charger circuit design help

    Hi,     I am almost done with designing the PCB. But one more question I want to ask is: Should I directly connect the battery to the modem or is there a need of any isolation or some kind of protection circuit required; like current limiting. Any suggestion will be appreciated. Thanks.
  9. hubble

    12V battery charger circuit design help

    Thanks a lot Hero999. I am going start this project as soon as possible. Thanks again for helping.
  10. hubble

    12V battery charger circuit design help

    Thanks Hero999 for your quick response. Although I posted a few links but I am not sure whether these circuits are really reliable. I mean as I am new to electronics I don't know whether these really are the circuits to start with. If they work perfectly then I am going to start my project. Thanks.
  11. hubble

    12V battery charger circuit design help

    Did I post the question in the wrong forum????
  12. hubble

    12V battery charger circuit design help

    Hi Sir,         I am quite new to electronics. I have a modem (from Teracom) powered by 12v(DC) 1.5Amps adapter. I want to run this modem using a 12v battery which needs to be automatically charged using 230V 50Hz AC power. I came across many schematics when searching on the internet. Following...
  13. hubble

    Maximum current

    I got it. Thanks Hero999
  14. hubble

    Maximum current

    Thanks Hero999 for your quick reply. Of the following four options what will you choose? 1) 0.5A 2) 1.0A 3) 2.0A 4) 3.0A I was asked this question during placement exam and I marked 2A giving the explanation that voltage will drop until the value of current is reduced to 2A. Am I correct? ...
  15. hubble

    Maximum current

    Hi,         I have one question. Suppose I have 24v/2a DC power supply. If I connect 8 ohm resistor across this power supply what will be the current flowing through the resistor? And on what factors does the maximum current of power supply depend?
  16. hubble

    Parametric Interaction

        In my initial post I said I want to get rid of wireless headphones. My goal is to aim     a sound signal at a particular point without anybody in the area hearing it.
  17. hubble

    Parametric Interaction

      I myself couldn't find enough relevant information. But I did find a link.   http://www.explainthatstuff.com/directional-loudspeakers.html    See if that can help.   Thank you.
  18. hubble

    Parametric Interaction

            I want the device to transmit within 7m. Basically I want to get rid of         earphones. I don't want it to be so much powerful. I just want to use it at         home for entertainment purpose. I don't want to disturb my neighbors when I         am on loud music.         I...
  19. hubble

    Parametric Interaction

    Hi,         Can somebody help me with the circuit to produce directional sound. I read somewhere that ultrasound of certain frequency acts as a carrier wave and the information is the modulating wave. But I couldn't find the schematic. Is it much like the same as producing AM or FM? 
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