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

Jack Jackson jackdamery at hotmail.co.uk
Sat Jan 3 16:39:05 CET 2015

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?


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