What is the duration of a "split second"?How can I activate the relay as if it was energised for a split second
Does this mean the relay is to be self-holding?The relay must trigger but only once but the 12v will remain live in the circuit.
I really don't think this is such a good idea. A transformer used in this way is likely to draw a large current from the supply, because the current in the primary would build up to a value limited only by the winding resistance. This could lead to a dangerous situation, as the transformer and whatever was feeding it could burn out. Even if the current is limited by a suitable external resistor, the consumption is likely to be heavy.That'll work. I didn't think of it because I have large electrolytic capacitors laying around all over the place. Easier than thinking about what kind of transformer will do the job, and if I have one. Hopefully, MrPad will have a pile of transformers laying around.
This could also be done with a small capacitor and a transistor to amplify the pulse, but that solution is more complicated than the original circuit!
by Duane Benson
by Jake Hertz
by Duane Benson
by Aaron Carman