LEAP#285 The Boldport Tap
The Tap is a Boldport Club retro reproduction of a lovely 7400-series logic circuit published in a 1974 Elektor article.
It implements four touch-sensitive inputs and multiple outputs: logic-level and it’s complement,
as well as open-collector equivalents able to sink greater current.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#284 The Boldport Gent
Building The Gent, Boldport Club Project #10. A simple circuit on a beautiful board.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#061 Set-Reset Latches
I recently revisited some old projects after watching Ben Eater’s
great video explaining SR latch behaviour.
First, I breadboarded a Set-Reset Latch with BJTs in
LEAP#061,
tested it with an Arduino in
LEAP#062,
then later built a Set-Reset Latch with NAND gates in
LEAP#077.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#283 XOR with NAND gates
I recently needed an XOR gate, but only had NAND gates on hand.
NAND (and NOR) gates are sometimes known as “universal” logic elements, as it is possible to contruct any other type of logic gate with them.
So while a little wasteful, I’m using the four NAND gates of a single 74LS132 chip to produce one XOR gate.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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