In this post, I will demo how to weld the drawdio.
Step 1
First we need to prepare the hardware as the following.
Step 2
We will weld Resistance -> Ceramic capacitors -> Electrolytic capacitor -> Transistor -> IC -> Horn -> Battery holder in a line
Show as the video
Step 3 result show
Use one hand to press the paper, and another hand to write with the pencil, when you write, you will hear the sound from the horn.
Notice: make sure the hands make a circle, one hand touch the paper another control the pencil.
As the video show