A half-adder is a digital circuit capable of summing two binary digits to form the sum, and a carry. For example, using binary notation a half-adder will compute the following binary relations:
0 + 0 = 0
1 + 0 = 1
0 + 1 = 1
1 + 1 = 0 and a carry
That is a sum of zero and a carry of one. The half-adder forms the basic unit for building much larger and complex adding circuits and can be built from five NAND gates. The kits comes complete with all parts to build a fully functional half-adder. The only thing missing are four 1.5 v batteries. Parts include five NAND gates, jumper cables, breadboard, battery pack and two input switches to represent the binary inputs. Each NAND gate displays its state via a LED, it is therefore possible to easily get an idea of the state of all the gates simply by inspection.
The kit also comes with a detailed manual on how the individual gates operate, how the half-adder operates and full assembly instructions making it suitable for beginners. With two kits it is possible to make a full-adder (see manual).
I am interested in retro computing and having built a half-adder from elementary transistor gates. I thought it would be worth making it available as an educational kit.
This kit will help users understand transistors, logic and simple binary addition in a single kit.
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I do freelance electronics and programming for education.