Hey guys. Can someone help me with this circuit?
http://www.discovercircuits.com/H-Corner/secwireloop.htm
Where it says "beeper" do they mean a speaker or do they mean a buzzer?
And can I replace the 2N7000 transistor with a 2N3906?
Here is a picture of a schematic that gets the job done, but it drains the battery.
Ok, see the middle wire? While that middle wire is connected the led will not light up because the current will take the path of least resistance. So I would probably put a resistor in front of the LED.
But...
Hello all. I am trying to build a very simple circuit and need some help.
I want to have an LED connected to a battery, and if a wire is unplugged from the circuit then the LED lights up.
Does anyone know how I can make this happen?