Hello,
I'm trying to design a very simple circuit where I can switch a 110VAC 10A load with a reed switch (max switching current 0.5A). I will need a relay to switch the 110V, but what I'm trying to determine is if I can avoid using a transformer to power the relay coil. I'd like to use something small and simple (resistor) to lower the already present 110V to a voltage small enough to power the coil and not fry the reed switch. The load of the coil will also be very small, so I'm guessing there wouldn't be much heat dissipation from the resistor.
This is a rookie guess at a solution! If I'm on the right track, I don't know how to calculate the necessary resistor size for whatever my coil specs are (I haven't bought a relay yet - still trying to discover if I'm on the right track).
With thanks
Mike
I'm trying to design a very simple circuit where I can switch a 110VAC 10A load with a reed switch (max switching current 0.5A). I will need a relay to switch the 110V, but what I'm trying to determine is if I can avoid using a transformer to power the relay coil. I'd like to use something small and simple (resistor) to lower the already present 110V to a voltage small enough to power the coil and not fry the reed switch. The load of the coil will also be very small, so I'm guessing there wouldn't be much heat dissipation from the resistor.
This is a rookie guess at a solution! If I'm on the right track, I don't know how to calculate the necessary resistor size for whatever my coil specs are (I haven't bought a relay yet - still trying to discover if I'm on the right track).
With thanks
Mike