Amplitude modem

126

01:03:56

500khz signal is carried by 8khz carrier wave using opamp and is demodulated with lowpass filter and the signal is being extracted out with little phase shift

published 6 years ago

jpoulin0901

6 years ago

You actually just mixed two signals (kind of) and then filtered one back out. That's a very good start to modulation, but doesn't really count. Modulation implies that the modulating signal is changing some property of the carrier. Mathematically, you kind of need to be multiplying some two parameters together to be performing modulation; adding is not enough. For example, in amplitude modulation you are actually directly multiplying your carrier and modulator amplitudes together whereas in frequency modulation the modulating signal controls only the frequency of the carrier. Those are the most commonly talked about but there are new schemes coming out all the time. It's a fascinating field that gets extremely clever. I recommend using Desmos to explore the math too. Have fun.

sidhardh

6 years ago

Thsnk you for you connent. I am just a newbie. Your comment is encouraging 👍👍. Much appreciated

nicholasha

3 years ago

Do I smell a ring mixer project?

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.