# What switch can I use ??

Discussion in 'Electronic Basics' started by Chretien, Mar 8, 2005.

1. ### ChretienGuest

I need a switch that can do the following things on this diagram.

Basically I have taken apart a First Alert Flashlight. Really its just for
education. I don't really have any purpose in building it. What a boring guy
I must be. Imagine spending Hours taking apart a flashlight just to see how
it works and then not even building it. Anyway I digress.

I will submit the diagram to the newsgroup when I'm finished for final
inspection. But I'm a littlestumped on the switch. The flashlight has a
mechanism that when you pull back on the thumb slider of the flashlight the
120 volt plug comes out so that you can plug it into the wall.

The ingenuity of this is that when the slider is in the recharge posistion
it sort of prevents the circuit from turning thelight on and will not let
120volts flow through the light bulb and the rest of the circuit and blow it
up.

The following diagram i have made indicates the type of switch i need. I
would "like" a switch that basically switches two complet circuits in one
flip. Perhaps for small projects there is no such thing. perhaps it would
need two switches but Im not sure how to do this and stop the electricity
flowing through the light and the 120v at the same time if you had two
swtiches.

Im not sure im explaining it well. But if you do understand can you point me
to some switches that might work with links so I can see what is in the
market to look for.

By the way as I look at my diagram I don't suppose I need a position 2. This
could simply be the off possition as well. Just dont plug it into the wall.

Battery
|
|
|
| TO Charging Circuit and Battery +
| |
Position 1 |Pos 2| Position 3
\ | | | /
'-------------o \o o o/ o--------.
| | ___
.-. o-( )--
( X ) (---) Wall plug
'-' o-(___)--
| \ / |
'-------------o \o o o/ o--------'
| | |
| |
| |
| TO Charging Circuit and Battery -
Battery

Positions

1.Flashlight Turns on

2.Flashlight Turns off

3.Flashlight charges and is isolated from
Position 1
(created by AACircuit v1.28.4 beta 13/12/04 www.tech-chat.de)

2. ### Neil PrestonGuest

I believe what you need is a two-pole three position switch. If you don't
need the center position to connect to anything, you can use a double
pole-double throw center-off toggle switch. (which is much easier to find.)

Each pole is a separate switch, with separate terminals. Each pole therefore
controls its own circuit, but is actuated by the same knob or handle.

Good luck.....
Neil

3. ### Rich GriseGuest

That would work if "Battery" and "To Charging Circuit and Battery +" are
in fact, the same point electrically. Otherwise he'd need a 4PDT, and
ignore four of the contacts:
___ __
This is in position 1 - two would be o o o and three, o o o

Cheers!
Rich

4. ### Roger JohanssonGuest

circuit stairs light switch

and found:

http://www.1728.com/project2.htm

Look at the end of this web page, scroll down 75%. A few circuits often
used in stairs and corridors where the same lamp(s) need to be switched
on or off at two places. It is a classical wiring problem.

5. ### ChretienGuest

Yes they are the same point electrically Thanks. for everyones help.