Sometimes I get a bug up my bonnet and just have to ask what may amount to a silly - or even useless question. Well, guess what I've got:
The above relay (data sheet) is a 12 volt relay with internal ohmage of 720Ω ±10% (measured 742Ω) and I didn't see anything in the data sheet about inductance of the coil. Is that because the inductance changes when the relay pulls in? Yes - or No - that's only part of my question. The other part is if I take a coil and measure its resistance is there a way to calculate the inductance?
Someone's going to ask what I'm doing with it. It's no secret. I'm not inventing free gold. Just looking at a possible solution to a question someone asked on this site before about momentarily closing a relay when power is applied and again when power is removed. You may remember the thread; and I'm not trying to help anyone solve anything. I'm just wondering if a particular circuit might work. The answer is "Probably not" but it's an answer I'd like to come to on my own.
So, this relay - what is its inductance, given a resistance of 742Ω?
The above relay (data sheet) is a 12 volt relay with internal ohmage of 720Ω ±10% (measured 742Ω) and I didn't see anything in the data sheet about inductance of the coil. Is that because the inductance changes when the relay pulls in? Yes - or No - that's only part of my question. The other part is if I take a coil and measure its resistance is there a way to calculate the inductance?
Someone's going to ask what I'm doing with it. It's no secret. I'm not inventing free gold. Just looking at a possible solution to a question someone asked on this site before about momentarily closing a relay when power is applied and again when power is removed. You may remember the thread; and I'm not trying to help anyone solve anything. I'm just wondering if a particular circuit might work. The answer is "Probably not" but it's an answer I'd like to come to on my own.
So, this relay - what is its inductance, given a resistance of 742Ω?