External Heatbed Hotbed Mosfet Module

[lkomnino]

This is my 1st 3D Printer, and while doing research, come along advise to use an external mosfet to power the heatbed. Finally got mine from Aliexpress https://www.aliexpress.com/item/Hot-sel ... 0.0.hm9FWr
Just wanted to know what is recommended wiring?
aliexpress site says:

Usage :
1. Connect Power to power source, please note the anode and cathode.
2. Connect Hotbed to heated wire , please note the anode and cathode.
3. Connect digital control signal to Gnd,D8.
4. Connect the control signal of Ramps1.4 or MKS MOSFET to -Bed+
5. Choose one signal group to connect.

So I did this: [attachment=0]EG.JPG[/attachment]

Is there a digital signal i can take instead?

[_kaktus_]

I understand a digital signal to be a low voltage signal. This voltage is equal to the main power supply voltage µC.

This is important.

The drawing you have shown leads to a signal other than a digital one.
If you have a schematic diagram of the circuit you bought, we could check whether such a connection will destroy it.

...

A photograph of your module shows a optocoupler. I guess He is controlled by this digital signal.
Enter its type.

...

That will not do anything.
Without a scheme I will not come up with anything sensible.

You can always do an experiment, at most something will break down.
But no one will lose their lives. ;-D

[BR365]

Very interesting,
I heard about this, because the i3 Pro C board needs really very long to heat up to 90 degree Celsius.

Moritz

[NickNonsense]

hmm. I'm curious about this too as I'd like to take the load off the board.

[Tomyuan]

Maybe the heat bed can work better than ever?

[Errol]

with this set up which pair of dc wires supplies heatbed on the input from the psu on to the 4 pin plug I am setting it up now I suppose I could just disconnect one power line and see which one doesn't heat up