Friday, March 1, 2013

AM modulation with transistors.

So I'm an engineering student and I'm taking a communication class. (Not public speaking) and we were learning AM modulation. What does a maker do? Makes one.

I based it on the NJM#1496D. Since I was wanting a general idea of how it workes, I used general values for the resistors, and a handful of npn transistors (likely 3906 but defiantly npn)

The fundamental way it works is this, a differential amplifier is driven by the carrier. This is switched by a transistor with the message signal driving it and they are limited by a current mirror. The actual circuit is a bit more complex and is capable of biasing and such but that's the basics.

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