Instructables

How do I make a Square Wave Generator?

I need to make a square wave generator for a project. Does anyone know how to build a square wave generator that can generate a frequency 100-150KHz? 

Check out this PDF. You'll find the answer there.

Qa
Maybe you could use the old oscillator-from-cmos-inverters-trick:
http://www.fairchildsemi.com/an/AN/AN-118.pdf
inverter-oscillator.png
seandogue4 years ago
555 followed by any of dozens of logic chips will produce a nice clean square wave
(555 produces your clocking signal, and the logic chip gives you a really nice high rate-of-change edge) I prefer the easy method of using a 555 setup in astable mode with a pot for frequency control, then following the 555 with a74000 or 4000 series counter chip to define a true 50% duty cycle signal. Cheap as sin and educational, as well as easy to design and build...it's all cookie cutter from the data sheets.
lemonie4 years ago