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Simple discrete AM receiver circuit

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redpixel

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Hi all!

I want to build a simple AM receiver in the 30 MHz range. It's for a hobby project so the requirements might seem strange but it needs to have quite good selectivity for nearby disturbing signals.

What would be a good topology to use? I think it would be wise to go for a superheterodyne receiver in order to be able to design a selective filter? I am an electronics beginner and want to design it using discrete components, no IC's, so preferrably nothing super complicated. The other alternative I was thinking about was something along a crystal receiver, but I guess it'll be hard to design a tuneable selective filter...

What would be a good circuit simulator to use for simulating a circuit like this? I want to be able to design a circuit using transistors etc. and feed it with an AM modulated signal at 30 MHz (with added disturbing signals) and then look at the baseband output, preferrably both in timedomain and frequency domain? Or perhaps it's enough to simulate timedomain as long as you have some sort of FFT available?

Thanks for all help!

Best regards
Martin
 

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