I am currently generating audio frequency squarewaves in the audio editing software "CoolEdit". Although there are others that will do the same job.
However, I need something more harmonically pure for test purposes, ie. a squarewave that is perfectly rectalinear and has virtually instantaneous rise and fall times.
It needs to deliver a 12V swing and hold up under a 16 Ohm non-reactive load.
What type of circuit can I add to my soundcard output that will do this best?
Mark Roberts