Recent content by JamesBourne1

  1. J

    Raising Ni-MH Voltage

    Let me rather say what I'm trying to do: I want to create a sine wave of 140Hz with the frequency as accurately as possible.  This will be played through on a 3.5mm earphone.  My current idea is to use a 555 to create 140Hz as accurately as possible and filter the square wave to sine.  I'll be...
  2. J

    Raising Ni-MH Voltage

    I'm currently building a project that generates a frequency using a 555 timer.  Since the power requirements are low, I thought of using a small, rechargeable battery.  After dismantling one of those "battery-less" shake flashlights, I found a Ni-MH 40mAh 3.6V battery inside. My problem comes...
  3. J

    Convert sine wave to square wave

    Hi again, I read a about the filters as you mentioned (RC filter) in your answer and have gotten some results.  I am posting my solution thoroughly, just to make sure I'm heading in the right direction as I'm still a newbie in electronics. On Wikipedia I found the following equation under RC...
  4. J

    Convert sine wave to square wave

    Hi everyone, I am building a circuit that will produce a sine wave as output. I am using a 555 timer (astable) to create a frequency of 140Hz.  This produces a square wave with an amplitude of about +5V. Note that voltage is 0V and +5V (not -5V and +5V). My problem is that I do not know how...
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