3.) Design an astable multivibrator, using +/-10OV rails, that generates a square wave with a frequency of 500HZ. Note that there is no restriction on your threshold levels, so you are free to choose...

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Extracted text: 3.) Design an astable multivibrator, using +/-10OV rails, that generates a square wave with a frequency of 500HZ. Note that there is no restriction on your threshold levels, so you are free to choose whatever you'd like for the upper and lower thresholds.