[sdiy] Buffer +/-5V square wave to 5V for Arduino in?

Jacob Watters jacobwatters at gmail.com
Sat Jan 3 16:46:46 CET 2015

Passing the square wave through a diode will remove the negative
voltage. I have done that in the past. I usually error on the side of
over buffering and protecting, so I also used shotkey diodes (ground
>| square wave >| +5V) and a voltage follower. However, those last two
are probably not required.

On Sat, Jan 3, 2015 at 10:39 AM, Jack Jackson <jackdamery at hotmail.co.uk> wrote:
> Hi All, I'm working on a synth to MIDI project.
> My VCO puts out a +/-5V square wave, I want to read its frequency using the Arduino
> digital in pin, but I'm aware it will probably blow it up if I feed it straight in.
> How can I buffer it so it becomes a safe 0-5V square wave?
> Cheers,
> Jack
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