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 Forum index » DIY Hardware and Software
Need a saw to squarewave convertor
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jackdamery



Joined: Apr 26, 2010
Posts: 73
Location: UK

PostPosted: Wed May 08, 2013 6:05 am    Post subject: Need a saw to squarewave convertor Reply with quote  Mark this post and the followings unread

So I have roughly 1v/Octave VCO based from Nicolas's circuit. I would like to convert the saw wave to a square wave so I can have both waveforms. Is there a simple circuit? I imagine a 555 could do the job by tracking the frequency and matching it with a pulse output?
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bubzy



Joined: Oct 27, 2010
Posts: 561
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PostPosted: Wed May 08, 2013 6:29 am    Post subject: Reply with quote  Mark this post and the followings unread

a comparator would do the job for you

http://www.radio-electronics.com/info/circuits/opamp_comparator/op_amp_comparator.php

basically (basically because my understanding is basic), it takes an input voltage, measures that against a reference voltage, and when the input voltage is above the reference voltage, the output is 1 and when it is below the reference voltage, the output is 0. using this method, you can also get some nice PWM from the output, by adding a potentiometer to control the reference voltage.

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Dave Kendall



Joined: May 26, 2007
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PostPosted: Wed May 08, 2013 9:03 am    Post subject: Reply with quote  Mark this post and the followings unread

^ what buzby said.

Quite a few VCO designs use a comparator to derive a pulse/square from a TRI or SAW wave - you may find a building block ready to go in online schems for these.

cheers,
Dave

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