More question related to Rg remote switch

[QSQCaito]

Ok, as i didn't wanted to hi-jack other threads, i started my own


I was planning to build these:

These is RG design, if need to be taken, i will wothout no problem.

But the only good relay, low signal i could found was the following: EA2 4.5

The questions are the following: Can that circuit be used to use a 4.5V relay, if so: i should just add a ressistance before the coil to frop voltage down to 4.5V, or should i change the whole set?

I was told TQ2-12v relay was suitable, but i'd have to change them over time. And i would prefer the EA2 4.5 because it's for low signal, has contacts that will work much better.

Bonus question: Should i connect somehow(via resistor) the ground of this circuit with the signal ground.. or i keep the isolated and lets see what happens?


Thanks a lot lot lot from advanced

bye bye

hope this helps to someone else

dac

[QSQCaito]

bump, any clue?

bye bye

dac