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  1. J

    Convert square wave to sine wave

    Why I want a sine wave: A square wave sounds bad when played through earphones. After I filtered it, it sounded much better. After searching the internet, I have found a 555 CMOS which requires a very low supply voltage (2V). The circuit will run from a rechargeable battery (one gotten...
  2. J

    Raising Ni-MH Voltage

    Hi Steve, I know that the generator will be able to charge a battery with a higher voltage, but the one I have is quite small and I can't seem to find others where I live; That's why I really want to use it. I'm using a 555 to generate 140Hz frequency and want to keep as accurate as...
  3. 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...
  4. J

    Convert square wave to sine wave

    After a bit of reading and experimentation I managed to get a good sine wave using a 3 pole RC filter. (See attached photo) In response to Dave's question, I'm using a 555 timer to get an accurate frequency of 140Hz and will rather filter the square wave than generate a sine wave from...
  5. J

    Convert square wave to sine wave

    Would it be possible to convert the square wave using analog components (possibly an inductor)? If so, how would you calculate the component values? Note: I would have used an op-amp or something else instead of the 555IC if I could, but the circuit needs to run from batteries.
  6. J

    Convert square wave to sine 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...
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