Electronics > Projects, Designs, and Technical Stuff
AM FM Tuner .?
duak:
In the 70's I was into building Audio stuff and ran across the Direct Conversion receiver concept. One of our local AM radio stations was within range of my function generator so I cobbled up a balanced demodulator and prototyped an AM receiver. The fidelity was remarkably good because the bandwidth was far wider than what the typical AM receivers provided. I had trouble keeping the function generator frequency stable enough so the station's carrier kept coming in. I'll bet something like this could be easily implemented with more modern synthesizers and PLLs.
As for FM, I built a transmitter but never tried to build a receiver. Third order intercepts, Smith charts, linear phase filters and the like were more than I wanted to deal with back then. I also started working for real money so I just bought a Marantz tuner and left it at that. The AM wasn't as good as what the direct conversion could do, but I knew that I could never equal the FM. Nowadays, I see there's lots of stuff available to simplify things.
Cheers,
rdl:
--- Quote from: ebastler on February 21, 2019, 04:57:42 am ---
--- Quote from: rdl on February 20, 2019, 10:14:13 pm ---I can't seem to find a "disk-less" CD player.
--- End quote ---
Yes, these are hard to come by. ;)
--- End quote ---
What I'm looking for is a home audio component that would play FLAC and other digital files off an SD card or internal SSD instead of needing a disk, but otherwise be functionally similar to a CD player. About the closest I've seen is the Sony HAP, but it's more of an all in one set up, and stupidly expensive.
james_s:
I think the traditional component hifi thing went out of style right around the time digital music players became mainstream. Your best bet if you want such a thing is probably to gut an existing tuner, CD player or other component and install the guts of an MP3 player inside it, or just do what I do and plug a portable music player into the receiver and set it on top. The devices exist, just not in the form factor you're wanting.
johnkenyon:
--- Quote from: james_s on February 22, 2019, 12:50:52 am ---I think the traditional component hifi thing went out of style right around the time digital music players became mainstream. Your best bet if you want such a thing is probably to gut an existing tuner, CD player or other component and install the guts of an MP3 player inside it, or just do what I do and plug a portable music player into the receiver and set it on top. The devices exist, just not in the form factor you're wanting.
--- End quote ---
I'm imagining a semi gutted CD player where you press the eject button which operates the CD drawer and also tells the MP3 player to eject/unmount the media.
Human being then removes SD card from a slot within the drawer, replaces it, and then closes the drawer.
The drawer mechanism limit switch then turns off the tray motor whilst indicating to the MP3 player to mount the newly inserted media.
So you end up with a media player which always mounts and unmounts the media correctly, and in theory it should never get corrupted.
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