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  1. 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...
  2. 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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