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README.md
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README.md

#321 cordwood-too

The Cordwood Puzzle returns! Boldport Club Project #13, May 2017

Build

▶️ return to the LEAP Catalog

Notes

The original Cordwood Puzzle became an instant classic with club members, and the concept returns this year with a brand new puzzle. The cordwoods evoke an era of stuffing massive components into small spaces. This is real hardware!

As before, it really is a puzzle, so if you don't want any spoilers - read no further.


Unboxing and Parts Count

kit1

Ref Part Qty
R2,4,6,8,10,12,14,16 10KΩ 2W resistor, Multicomp MCMF02WJJ103A10 8
R1,3,5,7,9,11,13,15 220Ω 2W resistor, Multicomp MCF 2W 220R 8
C1 1uF ceramic capacitor, AVX SA305E105MAR 1
Q1-8 n-channel MOSFET transistor, Fairchild 2N7000 8
10-pin through-hole header, Multicomp MC34739 1
10mm yellow LED, Kingbright L-813YD 4
10mm green LED, Kingbright L-813GD 4
25mm M3 standoff, ETTINGER 05.03.251 1
M3 screws 2
PCBs 2
Piece of 0.84mm diameter 20AWG hookup wire 1

kit2

Power

The LEDs are rated for 20 mA with forward voltage of 2.V (yellow) and 2.2V (green). Therefore, with the current-limiting resistor of 220Ω, the maximum supply voltage is around 6.5V.

How It Works

Each LED is switched by a corresponding MOSFET. The MOSFET gate is pulled high by default with a 10kΩ resistor, so the defualt LED state is ON.

Each gate is also connected to a pin. If these are pulled to ground, the corresponding LED turns off.

Construction

Schematic

Build

With it's twin, the original Cordwood..

cordwood-too_twins

Credits and References