: The nRF24L01 module requires a strict 1.9V to 3.6V supply. Standard Arduino 3.3V pins often lack sufficient current stability, leading to "brownouts" and dropped connections. The YL-105 allows you to use the more robust 5V rail.
For convenience, I recommend downloading the and the PC817 datasheet separately, then combining their specifications—that is effectively the YL105’s complete technical documentation. yl105 datasheet
The LM393 output is open collector. The datasheet usually notes this, meaning you can pull it up to a different voltage (e.g., 3.3V for a Raspberry Pi) than the module’s VCC (5V). This is a major plus for mixed-voltage systems. : The nRF24L01 module requires a strict 1
: Irradiated polyolefin (PO), which is flame-retardant and fluid-resistant. Shelf Life yl105 datasheet