The relay shield goes the other way - it enables the core to switch a high-voltage supply on/off. I'm pretty sure it won't allow you to use a high-voltage source to power the core.
Powering the core from a high-voltage supply was discussed here:
The relay shield goes the other way - it enables the core to switch a high-voltage supply on/off. I'm pretty sure it won't allow you to use a high-voltage source to power the core.
Powering the core from a high-voltage supply was discussed here: