Reddit reviews NTE Electronics VHT3300M50 Series VHT Aluminum Electrolytic Capacitor, Radial Lead, 105 Degree Max Temp, 3300 µF Capacitance, 20% Tolerance, 50V
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Meets the requirements of MIL-STD 202, Method 208Consists of series type, nominal capacitance, rated voltage, temperature range, anode and/or cathode identification, vendor identificationMethanol, isopropanol ethanol, isobutene, petroleum ether, propanol and/or commercial detergents
Here's a diagram - https://imgur.com/a/oS7iO7I
And here are the parts (doorbell not included):
I will note that the rectifier and capacitor that I have listed are likely grossly oversized, I just used what I had on hand since it was a one off project, and I didn't feel like figuring out the proper specifications for them.
I have the Sonoff flashed with Tasmota. You can set the doorbell button up as a button on GPIO 14 through the configuration menu, then set the PulseTime option to 2 (0.2 seconds) in the console, so that the bell doesn't get stuck on if someone holds the doorbell button down.