Input gain resistor on Egnater modules...

[joey_truelove]

I believe this is the R1 on Randall modules, but I don't seem able to locate it on my Egnater modules. Does it have another component number with these, are they not present or what's going on? Just want to make certain it has the correct value of 150 ohms.

Cheers!

 

[joey_truelove]

Or is it so that this resistor is only present on opto-coupler boards and not relay boards, like my Egnater modules have? That would make sense, as I cannot find either any 470 ohm or 150 ohm resistors anywhere on the boards.

 

[SacredGroove]

Yes, the R1 resistor is for the optocoupler it leads to. R2 and R3 also serve the same purpose as R1.

 

[joey_truelove]

Yes, the R1 resistor is for the optocoupler it leads to. R2 and R3 also serve the same purpose as R1.

Cheers mate! That's the R2 and R3 of opto boards, then? No such component to look out for on relay boards at all?