Cordwood Puzzle, second edition (Project #3, May 16)

£15.00

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Product Description

In the 1950s and 1960s inventive engineers saved space by using the 'cordwood' assembly, where components are sandwiched in between two circuits boards. This construction became less useful with reduced component sizes, PCB manufacturing, and surface mount technology, but is still a lovely piece of history. Combining both old and new, the Cordwood Puzzle is a tribute to this construction.

The puzzle is to correctly assemble the circuit with the components supplied. Once completed, all LEDs light up when power is applied, and when connected to a controller board each LED can be individually controlled. (When connecting to a board, make sure that the I/Os can tolerate the voltage levels that are applied to the Cordwood. Also, make sure that you do not short power and ground!)

Unfortunately(!), all the comprehensive assembly guides are mysteriously missing from the kits (but a surviving copy may be found here).

Kit includes

  • x2 96.6x16.6 mm PCBs
  • x2 10mm red LED, Kingbright L-813ID
  • x2 10mm green LED, Kingbright L-813GD
  • x2 10mm yellow LED, Kingbright L-813YD
  • x1 n-channel MOSFET transistor, Fairchild 2N7000
  • x1 1µF ceramic capacitor, AVX SA305E105MAR
  • x1 6-pin SMD header, Samtec TSM-106-01-T-SH
  • x1 2-pin SMD header, Samtec TSM-102-01-T-SH
  • x6 150Ω 2W resistor, Multicomp MCF 2W 150R
  • x6 10KΩ 2W resistor, Multicomp MCMF02WJJ103A10
  • x2 24.5 mm M3 standoffs
  • x4 8mm long M3 screws
  • A bit of 0.84 mm diameter wire


This item will be shipped to you together with the next scheduled shipment, normally on the 15th of every month.

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