I'd like to build a 433 MHz receiver from scratch. Is there a schematic or some material to learn how to build one?
Google search didn't come up with much in the way of building one from scratch.
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Sorry that I can't point you to an answer, but I can shed some light on why Google doesn't come up with much (my response is too long for a comment). The reason is very few designers have access to the equipment necessary to properly design a 433MHz circuit from scratch. Normal oscilloscopes are definitely out, and every little 0.1mm corner of a pad of your circuit board is actually a tiny inductor and capacitor connected to every other part of your circuit (parasitic/stray inductances and capacitances are killer at frequencies that high).
Also, the schematic of a 433MHz design is impossible to divorce from the geometry of the PCB layout. In other words, they would have to give you the schematic as well as the exact PCB geometry to make it work. Also, unfortunately, hand soldering is out due to parasitics. (Soldering an antenna on is one thing, but soldering the whole board is going to completely change the response of the circuit).
I don't mean to discourage you. I just want to make sure you know you're trying to slay a very big giant.