Print PDF
Favorite
Email
Step 3The Circuit:
The circuit is simple, with two cells in series feeding an LED via an optional series resistor.
With no resistor, the LED is brightest but the life is short. I selected a 220 ohm resistor as a compromise between reasonable life of the small battery and visible brightness.
Holes are drilled on the transparent sheet of perspex to accommodate the two cells and LED. The resistor is accommodated in a channel cut between the holes.
The components are soldered and pressed into the plastic so that the two sheets may be aligned and stuck to each other.
Remove the paper from the two surfaces of plastic, clean, and join them using superglue or chloroform. Clamp together for about an hour or so.
Then extract it from the clamps, remove the rest of the protective paper, insert the two cells as shown and hold them in place with some conducting springy stuff and a screw. The LED will light, and the edges of the transparent sheet will shine as well.
Present it to your chosen Valentine.
With no resistor, the LED is brightest but the life is short. I selected a 220 ohm resistor as a compromise between reasonable life of the small battery and visible brightness.
Holes are drilled on the transparent sheet of perspex to accommodate the two cells and LED. The resistor is accommodated in a channel cut between the holes.
The components are soldered and pressed into the plastic so that the two sheets may be aligned and stuck to each other.
Remove the paper from the two surfaces of plastic, clean, and join them using superglue or chloroform. Clamp together for about an hour or so.
Then extract it from the clamps, remove the rest of the protective paper, insert the two cells as shown and hold them in place with some conducting springy stuff and a screw. The LED will light, and the edges of the transparent sheet will shine as well.
Present it to your chosen Valentine.
| « Previous Step | Download PDFView All Steps | Next Step » |
 |
Add Comment
|
