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?
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Maybe you could use the old oscillator-from-cmos-inverters-trick:
http://www.fairchildsemi.com/an/AN/AN-118.pdf
http://www.fairchildsemi.com/an/AN/AN-118.pdf
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.
You should look at these first, then refine the question:
http://www.google.co.uk/#hl=en&source=hp&q=square+wave+generator+circuit&aq=1&aqi=g10&aql=&oq=Square+Wave+Generator&gs_rfai=&fp=4decbba4b4ffde8d
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