A collection of 21 posts
In the previous post in this series, we built the NOT gate — a relay wired to invert its input. Energize the coil, and the output goes off; release it,...
In the previous post in this series, we wired a relay's normally-open contacts in parallel and watched OR appear from the circuit without any abstraction required. Step back and look...
In the previous post, we built the AND gate from relays: two contacts in series, both coils must fire for the lamp to light. Boole's notation for that rule is...
In the previous post, you wired two switches in parallel and felt OR emerge from the circuit itself — a lamp that lights when either switch closes. In Post 2,...
In the previous post, you wired two knife switches in series — one after the other in a single line — and discovered that the lamp only lights when both...
In the first post in this series, we learned that a relay is a switch thrown by electricity — one circuit controlling another. That single device already hints at logic....
Right now, as you read this, something inside your device is flipping switches. Billions of them, billions of times a second, with no moving parts and no sound. But the...
TL;DR: The NOR gate outputs 1 only when all inputs are 0 (). Like NAND it is functionally complete — every Boolean function can be built from NOR alone. The...
TL;DR: Binary representation predates the computer by 3,500 years. Egyptian scribes used a shift-and-add multiplication algorithm, the I Ching encoded a 6-bit cosmology, and Pingala's Chandaḥśāstra gave the first explicit...
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