the air force invitation card

Oh I forgot to mention.

One night I was playing with the RSAF invitation card (to some scholarship talk) and decided to check out the circuit. Haha it was quite cool.

I took pictures but I'm lazy to upload. And I don't think the pictures help much in explaining also haha.

Initially there's this thin plastic slip with a hole in it. The non-hole area of the plastic slip is in between two metal contacts and hence cuts the circuit off. When you open the card, you actually pull this plastic slip such that the metal contacts come in contact (at the hole) and the circuit is connected. When you close the card, the plastic slip goes back in between the two contacts.

Okiee. That's all :p