More later maybe.
The then Philips TDA7000 may be of interest if you can find any.
Single IC RF/audio.
DC IF :-).

!!!
https://www.google.co.nz/search?q=3Dtda7000&num=3D100&tbm=3Disch&tbo=3Du&so=
urce=3Duniv&sa=3DX&ved=3D0ahUKEwjA09rOid_PAhUM0mMKHXZFAmgQsAQIIg&biw=3D1527=
&bih=3D836

Lonnnnng ago I used them in receivers for a data link for America's Cup
yachts.
TX x n  in pockets on sails.
Cluster of RXs.
Strain gauges -->  horsepower .

Neither a NZ nor a US nor Australian challenger .


  R


On 16 October 2016 at 11:23, Jason White <whitewaterssoftwareinfo@gmail.com=
>
wrote:

> Hello, as a personal project to become more familiar with RF circuits I
> would like to build an AM radio receiver. Online, I found a schematic whi=
ch
> uses the NE612 mixer IC to create a Direct Conversion ("Syncrodyne")
> receiver. I have modified the design so that the local oscillator does no=
t
> need a custom wound transformer.
>
> In my case, I don't require the receiver to have very good performance. I=
'm
> okay with the oscillator drifting and the audio "warbling" (due to
> frequency mismatch) under normal operation.
>
> I don't have any sort of matching network or filtering on the antenna
> connection; but I am hoping a 10m wire antenna will produce a sufficientl=
y
> strong signal for the mixer. I am unsure how strongly signals and noise
> outside of the AM band are going to affect the receiver. Ideally, I'd hav=
e
> a buffer amplifier on the antenna input and a bandpass filter that covere=
d
> the AM band, but I want to avoid making this too complex.
>
> I have attached a picture of the original schematic, a picture of my
> ltspice schematic, and zip containing my ltspice simulation.
>
> I would like to know if my design (ltspice simulation) seems reasonable
> before I try to build it. I welcome advice on improving the design, but a=
t
> the same time I do wish to keep things a simple as possible.
>
> Thanks,
> Jason White
>
> --
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> View/change your membership options at
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>
>
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