Laser Burglar Alarm -- Need Help

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can you tell me what the blue drawings are under the springs .....

Or is there really nothing there ... ?
 
john1 said:
can you tell me what the blue drawings are under the springs .....

Or is there really nothing there ... ?
Click to expand...
There are blue lines connecting springs. But those are just labels that were part of the box. You can ignore them. The labels mean nothing.
 
It's absolutely ok. I just hope that we will be able to accomplish something here. My heart's going to be pumping at 10beats/second until this whole ordeal is over.
 
Okay, so there arent components and stuff underneath, its just labels on the box.

The transistor in that last pic,
cant quite see which leg goes where ....
 
john1 said:
Okay, so there arent components and stuff underneath, its just labels on the box.

The transistor in that last pic,
cant quite see which leg goes where ....
Click to expand...
The spring where the red wire goes down to the -ve of 9V is the emitter. The spring where the red wire goes to the -ve of the siren is the collector. The other silver thing going up to the spring with no red wire coming/going from it is the base.
 
john1 said:
I take it that its placed as per the blue drawing , yes ?
Click to expand...
Only the transistor and the 9V battery clip are placed according to the labels on the box. The siren (and the wires coming to it) are in the resistors section.
 
Okay.
stick your voltmeter across the siren connections,
and connect the battery briefly, then disconnect the battery.

Any siren sound ?
Any voltage show on the meter ?
 
john1 said:
Okay.
stick your voltmeter across the siren connections,
and connect the battery briefly, then disconnect the battery.

Any siren sound ?
Any voltage show on the meter ?
Click to expand...
No siren. No voltage.
 
Ha,
my last post crossed with yours,
and i thought for a minute you were going to pull it apart!

When i edited, i saw you noted my post before i edited !
 
john1 said:
Ha,
my last post crossed with yours,
and i thought for a minute you were going to pull it apart!

When i edited, i saw you noted my post before i edited !
Click to expand...
Haha yeah. Instant messaging.
 
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