Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Having trouble with the most elementary project

Status
Not open for further replies.

missusliz

Newbie level 1
Joined
Feb 21, 2010
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,301
Hi,
If anyone can assist with this, it would be greatly appreciated!

I bought from Radio Shack:
1. A battery holder; holds two triple A batteries and has wire leads.
2. An on/off switch.
3. A lamp holder with a little 2.4 v bulb in it.

I know NOTHING about electricity, but I need to hit the switch and have the bulb turn on for one of the kid's inventions (this is just for the display, not part of the actual project, but I really want this to work).

This is how I hooked it up:

battery holder on left with wires going to the bulb in the middle. Switch on the right with wires leading to the bulb.

I matched the black wires from the battery holder with the black wires from the switch to the same node on the lamp holder and the same with the red on the other node on the lamp holder. Every time I hit the switch, the battery holder starts to melt behind the tension coils that hold the battery in the holder. I've gone through four battery holders!

Note: The switch didn't have wires, just two prongs sticking out of the back, so I took the wires off a battery holder and taped them to the prongs. I didn't pay attention to color of the wires, I just taped them on. Could I have put them on wrong and now when I'm matching red to red, I'm actually connecting black to red?

Ugh, if this is confusing, I apologize, I'm usually more eloquent, but this is not my area of expertise, obviously! Any insight would be greatly appreciated!

Liz
 

Audioguru

Advanced Member level 5
Joined
Jan 19, 2008
Messages
9,238
Helped
2,136
Reputation
4,266
Reaction score
1,960
Trophy points
1,393
Location
Toronto area of Canada
Activity points
58,058
I think you need to learn a little about electricity.
Electricity and your circuit are very simple.
When you turn on the switch then it is short circuiting the battery.
 

betwixt

Super Moderator
Staff member
Joined
Jul 4, 2009
Messages
14,921
Helped
4,874
Reputation
9,766
Reaction score
4,661
Trophy points
1,393
Location
Aberdyfi, West Wales, UK
Activity points
126,953
Agreed!

All you need to do is connect them in series. One wire from the battery holder (doesn't matter which) to the switch, the other side of the switch goes to the bulb, the other side of the bulb returns to the other side of the battery. In other words in a loop.

At the moment, it sounds like when you close the switch you short out the batteries. The power they can provide is enough to heat the holder and wires.

Brian.
 

neils_arm_strong

Full Member level 5
Joined
Jan 5, 2006
Messages
289
Helped
22
Reputation
44
Reaction score
3
Trophy points
1,298
Location
Bangalore, India
Activity points
3,247
Just connect all of them in series.Start with one terminal of the battery holder.Connect this to one terminal of the switch.Take the other terminal of switch and connect it to one of bulbs terminals.Now the other terminal of the bulb goes to remaining terminal of the battery. Polarity and color codes are not an issue in this circuit.
 

biff44

Advanced Member level 5
Joined
Dec 24, 2004
Messages
4,899
Helped
1,360
Reputation
2,716
Reaction score
1,039
Trophy points
1,393
Location
New England, USA
Activity points
36,861
So when you turn on the switch, the circuit melts. Congrats! It takes engineers many years of college to learn to do the exact same thing!
 

rosarioantony

Member level 4
Joined
Aug 4, 2005
Messages
73
Helped
6
Reputation
12
Reaction score
1
Trophy points
1,288
Activity points
1,846
connection1 -> black wire of the battery -> one terminal(black) of the switch
connection2 -> another terminal(red) of the switch -> one terminal of the bulb.
connection3 -> another terminal of the bulb -> red wire of the battery.

It should look like a ring when connected.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top