Electronic – Make sure that this circuit is safe

Looks like you are trying to make a crude ASK low bit rate receiver. In general, you need precise slicer thresholds or a decide if you want adaptive AGC or peak Hold and compare. Your choice of inverter has a wide spec range on threshold.. ( It's not always V/2) Your second diode detector should be inverted or use a non-inverting buffer or linear gain feedback so positive envelopes are detected.

Overall its poor but can be made to work for one unit, but never all units. Its called worst case tolerance analysis and supply sensitivity analysis and your design is conceptually ok at only one supply level and never the same.

The Xtal is used in series resonant mode where impedance is lowest for maximum gain. Was that intentional? what F.
Generally people use 38KHz carrier detect methods for remote control chips or use IRDA transceivers for higher bit rates for simple IR communciation with AGC.. . Mucho cheaper and reliable.

I've used both of them, and I like the analog ones more.

The reason is that with IR, there can be a significant amount of 'stray light' coming from the environment. If you have an analog sensor, you can adjust your thresholds and baselines to tune the sensor to your operation (you have a lot of flexibility). When I used it, I would take 100 readings when I turned the device on, use that as the baseline.

With the digital ones - you're stuck if it's triggering and you don't want it to (you need to physically shield the sensor).

They do use the same sensor in both of the devices, they just change how the phototransistor operates (cap+resistor for the digital version, just a resistor for the analog version), so if you really wanted to, you could change the operation of the sensor (if you have the right resistors and caps).