(click the link to see the circuit)
http://www.geocities.com/martin_pc_maintenance/img009
With what I have now, you plug anything into the plug on the circuit. The circuit plugs into a wall outlet.
When you press the switch, the power does not go to the device plugged into the circuit. When you let go of the switch, it lets power back through.
What I want it to do is:
when you push the button, power is not let into the device, turning it off.
when you let go, nothing happens.
I want power to be restored to the device when the switch is pressed and released a second time.
Is this possable?
2007-02-06 06:19:23 · 3 answers · asked by martin_pc_maintenance 3 in Science & Mathematics ➔ Engineering
FIRST...Warning you're working with 120VAC...
yes it's home current but it's still possible to DIE when working directly with it...
Technicians Lesson......NEVER EVER work with high voltage projects without a buddy to watch you!!
Well,
your switch is the problem.. you have what is called a
"momentary push button switch".
a momentarty switch ....only disconnects or connects while pressed.
depending on wether it's an always on(NC) or a always off(NO)
(NC=normally connected NO=normally open.)
You'll want a
"push button switch".
That kind of switch will toggle itself between on and off each time you press it.
I would look at a hardware shop for a lamp push button switch.....
that will handle it for you....should be $5 or less...it's for 120 VAC typically but it's going to allow your 12VDC to pass thru as well...
A safety note..... you have a relay known as, a SPST (Single Pole Single Throw) it's connected to only one wire and interupts the circuit.....but that's a little dangerous.
You really want a DPST (DOUBLE POLE SINGLE THROW) relay... house electricity is based on one leg being powered and one leg not...IF a persone rewired some of the house against electrical code...(happens all the time) you could NOT disconnect the side that is active....
Leaving the active side going thru your project (IT can even go thru the equipment you connect to the project) and risking the life of someone near it thinking it's off!!!!!!!!
A DPST relay had a dual of connections and you can turn off BOTH power lines with the one relay.....
this picture.....
http://awineshop.com/uploaded/blinker/schematic.JPG
Diagrams the operation of the relay I suggest...
altho you will want to connect each side of the wire from the plug to each side of the relay's connectors as oopsed to both connected to the same power source.
Otherwise you should be ok...!!
Have fun!! BUT!!!
be very careful with that 120VAC side of your circuit!!!!
if your relay is made the way I think it probably is.....
it's setup like.... http://www.ertyu.org/steven_nikkel/images/bsm/relay-diagram.jpg
IF it is.....then the output pins are VERY dangerous as they will have 120VAC on them!! One or the other depending on which way the switch is set...SO...if the equipment is off.. power can still get to you from the other connection of the relay!
Remember!! Technicians warning......NEVER EVER work with high voltage projects without a buddy to watch you!!
-dawgy
2007-02-06 07:02:14 · answer #1 · answered by Sumdawgy 3 · 0⤊ 0⤋
Take a look at your switch, and see if you have a different set of contacts. Switchs can have NO or NC contacts. From your drawing looks like you have a NC switch, that means normal state it conducts electricity, when you push it, the circuit is broken. You need a switch with NO normally open contacts. You may have NC normally closed contacts.
2007-02-06 07:01:10 · answer #2 · answered by Anonymous · 0⤊ 0⤋
its seems like you have a wiring problem. if possible you hosuld take the wires and play around with them. In my science clas we made a flashlight and we had some trouble wtih the wiring but other than that i dont know... good luck!
2007-02-06 06:24:44 · answer #3 · answered by mylittlesecret2203 2 · 0⤊ 0⤋