hi all,
i am looking to build a square wave generator so as to condition an input signal from a sensor.
the sensor will deliver a sinusiodal signal with varying frequency and amplitude, i want to convert this to a square wave with a varying frequency to match that of the sensor but with fixed amplitudes, specifical TTL logic high and low (5v and 0v).
can this be done with something simple like a 555, and does anyone have any circuits available?
thank you!!

 

Hello,

Look at a schmitt trigger.
In the eBook there is this example:
http://www.allaboutcircuits.com/vol_3/chpt_8/12.html

Bertus