The complete circuit diagram can be downloaded from here: adder.pdf
All of the parts are the same as the ones used from the first Quick Video. To recap, they are:
- 2N3904 NPN Transistors
- 10k Ohm Resistors
- 330 Ohm Resistors
- 1P2T SPDT Vertical Slide Switch
- 3mm and 5mm LED Lights Emitting Diodes Assortment Set Kit
(I used the 5mm Red 1.9-2.1V 20mA and 5mm Yellow 1.8-2.2 20mA diodes.)
You will also need wire; I used the 22AWG Solid Hook Up Wire Kit, and all this goes a lot faster if you have a wire cutter and a wire stripper. And of course you’ll need a breadboard to hook everything up with.
For power I simply used a battery pack and a couple of AA batteries.
If you wish to build this as a 1 bit adder that can be chained with other adders, build just the adder as shown in the circuit diagram; the LED driver circuits can be omitted until it’s time to present the results.