converting sinusoidal wave to sqare wave

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As long as the sine is large enough, you can use a pair of diodes to clip it at 0.7V p-p.
 
But what are you wanting the squarewave for?, with nothing except diodes you don't really have many options.
 
I want to design a square wave generator using diode circuits only. The
input to the circuit is an AC source (10 V sinusoidal @ 60 Hz)

hi,
As its been explained to you already , diodes will not give a true square wave.

Diodes are not 'active' devices, they will only clamp a sine wave.

So the resulting 'square wave' will always have slow rising and falling edges.

Again, whats the square wave going to be used for.???
 
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