http://www.ebay.com/sch/i.html?_from=3DR40&_trksid=3Dm570.l1313&_nkw=3DTDA7=
000&_sacat=3D0
TDA7000
En Sun, 16 Oct 2016 07:11:00 -0300, RussellMc =20
escribi=F3:
> 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&=
source=3Duniv&sa=3DX&ved=3D0ahUKEwjA09rOid_PAhUM0mMKHXZFAmgQsAQIIg&biw=3D15=
27&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 =20
>
> 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 =20
>> which
>> uses the NE612 mixer IC to create a Direct Conversion ("Syncrodyne")
>> receiver. I have modified the design so that the local oscillator does =
=20
>> not
>> need a custom wound transformer.
>>
>> In my case, I don't require the receiver to have very good performance. =
=20
>> 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 =20
>> sufficiently
>> 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 =20
>> have
>> a buffer amplifier on the antenna input and a bandpass filter that =20
>> covered
>> 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 =
=20
>> at
>> the same time I do wish to keep things a simple as possible.
>>
>> Thanks,
>> Jason White
>>
>> --
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>>
>>
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