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  1. hubble

    Capacitor charging using low voltage supply

    Hello, is there a good way to charge 10mF 63v capacitor to, say, 50v from a 5v 1.5khz source? Thanks.
  2. 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.
  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

    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...
  5. 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...
  6. 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?
  7. 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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