I have a 433MHz receiver modules (Model number MX-05V) The input voltage is listed as 5V but they don't list the output voltage.
I have seen this used without level shifting in a project in conjunction with an ESP32 module that requires 3.3v signals.
In researching how this was safe I found an answer that suggested that the output voltage would be input/2 but I'm unsure how this or why this is. Unfortunately the answer didn't provide detail, it just happened to mention it in passing. (https://electronics.stackexchange.com/a/103357/274778)
In short, my question is in two parts: What is the signal HIGH voltage (in theory ~2.5v?) for this receiver? Why is it that?
Below is the schematic for the part and a link to a product listing for it, note that on the listing the schematics are labelled backwards.
It's listed as a superhetrodyne receiver and what I take to be the output circuit makes use of a duel opamp (LM 358) but my understanding is too flakey to derive the output voltage from this arrangement.
Links to example of part: https://hobbycomponents.com/wired-wireless/1054-433mhz-transmitter-receiver-modules-with-antenna https://hobbycomponents.com/wired-wireless/615-433mhz-wireless-receiver-module-mx-05