This was an experiment I did with Bare Paint (conductive paint) in order to see if I could make the ever famous movie prop, the Flux Capacitor. This was done for the Omaha Maker Group and our May 21 build night with the focus on Bare Conductive Paint. In honor of Marty McFly, my flux capacitor is chicken yellow.
3 4401 NPN transistors
3 capacitors 4.7uf
3 47 k resistors yellow purple orange gold
2 470 ohm resistor yellow purple brown gold
1 120 ohm resistor brown red brown gold
1 100 ohm resistor brown black brown gold
9 volt battery
1 tube of Bare conductive paint
Step 1: Step 1, Printing the Flux
Step 2: Step 2, Building the Circuit
After all 3 leads of each transistor is set in a copper pathway of its own, add the 3 connecting wires to ground from the left side of each (the flat side facing you). Add next the capacitors to the right lead on the Transistor (Right of the flat side). Pay close attention that the side of the capacitor with the arrows down terminates at the negative, or cathode.
Use the claw-like wire cutters to remove extra lengths of wire after they have been soldered. Wire together the 100 and 150 ohm resistors to bring down the supply voltage from the 9V battery, thus avoiding burning out the LED's. Add the remaining resistors to the circuit and connecting wire.
Step 3: Step 3, Connecting the Circuit to the LED's
Once I verified the lights blinked in sequence, I added Bare Conductive paint to each of the corresponding negative and positive terminals on the LED's. After it dried, the lights blinked poorly or not at all. This was due to my design error, as I didn't take into consideration the amount of resistance of the conductive paint. Oh well, it still looks cool and very "Spidery!"
I decided to perform a bypass of this circuit trace and add in red copper connecting wires to all the LED's and it now works. I hope you enjoyed learning how to create a Flux Capacitor on the cheap! Woo Hoo!