.Drawdio... ;).
In the electronics team we started to work on some drawdios.A drawdio is a pen or pencil that makes some noises while a person is drawing or writing on something . We first had to start working on a circut board . We had to put the right cablesand the Electronic Capasitors, the recistors,the transistor and the farad into their right place, after that we had to swader them in the circuit board.The drawdio pencil works because of the current with the copper, the graphite of the pencil and us.These are the materials we used for the drawdio's:
1-)Battery holder for AAA batteries
2-)Strip of bread board
3-)10k resistor
4-)300k resistor
5-)Low voltage'555 timer chip
6-)1 NPN transistor
7-)1 PNP transistor
8-)1 680pF ceramic capacitor
9-)1 0.1uF ceramic capacitor (104)
10-)2 100uF / 10V capacitor
11-)A small speaker
12-)Copper foil tape
13-)1 pencil
14-)wire
15-)1 Thumbtack
this picture was taken by:
http://catundkater.files.wordpress.com/2009/06/drawdio-pencil.jpg
