Transistorless AM

338

04:46:50

Uses just one diode. Not even a single transistor! Unfortunately, this is very harmonic rich, and all the power is coming from from the radio frequency oscillator and input signal.

published 8 years ago

hurz

8 years ago

To get a sharper filter characteristic and less harmonics decrease the resonator impedance. Check this http://everycircuit.com/circuit/6466014899601408

jason9

8 years ago

Or you could just use an output filter, like in my “Transistorless AM 2.0”. The way you’re doing it gives a sluggish response at higher frequencies resulting in degraded signal amplitude, while with the output filter the harmonics get removed and the response time stays untouched.

hurz

8 years ago

What is a sluggish resopnse at higher frequencies? I know, you are never happy about my circuits I publish. But please be a little more precise in you critic.

jason9

8 years ago

I’m saying that with you’re design, at 20kHz the response is a little sluggish resulting in the 20kHz modulation being a little diminished, but with the output filter the carrier is modulated fully. Of course, I doubt that any of this matters because at these high frequencies the radio signal will leak into the next channels signal.

hurz

8 years ago

I think it was clear you have taken 20kHz just for the simulation. @500kHz its not allowed to modulate in DSB 20kHz. But I have accepted this as a way to run it within EC. And now you turn this as a negative point of my design! Don't you think that is more then childish?

jason9

8 years ago

That’s true, I suppose it is a little childish, but technically I am still a child at 12 years old. Not even a teenager yet.

hurz

8 years ago

You are getting younger every year. You are lucky.

John9981

8 years ago

i cant hear the station..

hurz

8 years ago

So let us know if you feel old enough and we can take your words serious.

jason9

8 years ago

Hey, just because I’m a child doesn’t mean that you can’t take my words seriously. It just means that there’s an extra 2% chance that my words a too childish. That’s all. As you can see by my many circuits I know quite a lot about electronics, or at least I do in the simulator.

hurz

8 years ago

You can't have both

zorgrian

8 years ago

http://everycircuit.com/circuit/5300171998232576

zorgrian

8 years ago

Above is a simplified version

jason9

8 years ago

Oh yeah, I think I thought of that, but I decided to keep it the way it was.

zorgrian

8 years ago

Well it makes a trivial difference anyway. Your version does the same job, and in some ways is more 'normal', in the sense that its probably unusual to find a real world situation where two signal sources are fed from one to another in series. Indeed, this would present more problems in electronics than would your design. 73!

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