relay that stays closed until power removed?

[Michael A. Terrell]

"Ron M." wrote:

On Jun 20, 9:46 am, "Tom Biasi" <tombi...@optonline.net> wrote:
"Greg Russell" wrote in messagenews:9672ogFhcbU1@mid.individual.net...

Hell, I'm not familiar with all the basic electronic component names; I'm
just learning, and need some help please.

I want to create an electronic joke for a friend's shop trainer: a push
button on the console of the trainer will be labeled "Do Not Push". If
someone chooses to push it, an electric horn will sound until the 12v
battery source is disconnected.

What type of switch or relay is it that will close and sound the horn
when the button is pushed, but will stay closed when the button is
released, then open when the power source is disconnected?

Don't forget the most important part of your plan.
What if he doesn't push it?

Good point. No point in having a booby trap if you don't have a
booby.

Then you label it, 'DO NOT PUSH THIS BUTTON!!!'


--
It's easy to think outside the box, when you have a cutting torch.

 

[Ron M.]

On Jun 20, 9:46 am, "Tom Biasi" <tombi...@optonline.net> wrote:

"Greg Russell"  wrote in messagenews:9672ogFhcbU1@mid.individual.net...

Hell, I'm not familiar with all the basic electronic component names; I'm
just learning, and need some help please.

I want to create an electronic joke for a friend's shop trainer: a push
button on the console of the trainer will be labeled "Do Not Push". If
someone chooses to push it, an electric horn will sound until the 12v
battery source is disconnected.

What type of switch or relay is it that will close and sound the horn
when the button is pushed, but will stay closed when the button is
released, then open when the power source is disconnected?

Don't forget the most important part of your plan.
What if he doesn't push it?

Good point. No point in having a booby trap if you don't have a
booby.