Print PDF
Favorite
Email
Step 12Step 2h: lead bending & soldering - variable capacitor
Now you will need to construct the variable capacitor C4. Take each of the two 3 by 3 inch sheets of copper foil and solder an insulated lead to a corner of it. Use about 6 inches of the 22 AWG solid core insulated wire for each piece of foil.
Next "sandwich" one end of a 4 by 12 inch patch of the fluffy stuffing material between the foil plates. The padding material should be about 1/4 to 1/2 inch thick when uncompressed. Select one side of the capacitor C4 to be "ground" and keep track of it -- this will be the upper side of C4 and will be facing out and away from the toy and towards the outside world. Place the 3 by 3 inch piece of plastic "card" (or scrap circuit board, or whatever) against the outside of the lower capacitor plate (the one that is NOT ground) this will serve to stiffen the foil "sandwich" and will be used to push on the power switch. Be sure that the stiffening plate is not between the foil pieces. (Since I was using copper foil with (optional) adhesive on it I simply stuck the foil to the plastic card.) Then wrap the rest of the 3 by 12 inch patch of padding around the capacitor plates to make a "sandwich roll". See illustration and picture below for visual aid.
Figure 1 shows the design of variable capacitor C4.
Figure 2 shows the variable capacitor C4 un-rolled.
Figure 3 shows the variable capacitor C4 all rolled up.
The resulting stack should be quite squashable.
Next "sandwich" one end of a 4 by 12 inch patch of the fluffy stuffing material between the foil plates. The padding material should be about 1/4 to 1/2 inch thick when uncompressed. Select one side of the capacitor C4 to be "ground" and keep track of it -- this will be the upper side of C4 and will be facing out and away from the toy and towards the outside world. Place the 3 by 3 inch piece of plastic "card" (or scrap circuit board, or whatever) against the outside of the lower capacitor plate (the one that is NOT ground) this will serve to stiffen the foil "sandwich" and will be used to push on the power switch. Be sure that the stiffening plate is not between the foil pieces. (Since I was using copper foil with (optional) adhesive on it I simply stuck the foil to the plastic card.) Then wrap the rest of the 3 by 12 inch patch of padding around the capacitor plates to make a "sandwich roll". See illustration and picture below for visual aid.
Figure 1 shows the design of variable capacitor C4.
Figure 2 shows the variable capacitor C4 un-rolled.
Figure 3 shows the variable capacitor C4 all rolled up.
The resulting stack should be quite squashable.
| « Previous Step | Download PDFView All Steps | Next Step » |
 |
Add Comment
|
