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Project Notes

#369 Ananas

Building the tropical end-of-year present from Boldport Club, Project #20 - ananas!


Here’s a quick demo .. (with special customisation)



Project #20 is the first designed by Ben, the new Boldporter. And it’s a beauty!

As is often the case, a small but interesting circuit is at the core of a beautiful design. The circuit is essentially four repetitions of an RC phase-shift oscillator.

Like other projects such as the famous Cordwood series, the design employs multi-board symmetry and 3D construction.

Unboxing and Parts

Boldport packaging and design just goes from strength to strength. What a beautiful kit!

Qty Item
12x NPN bipolar transistors, OnSemi BC547CTFR
12x 5mm clear lens yellow LEDs, Everlight 333-2UYC/S530-A3
12x Electrolytic Capacitors, Multicomp MCUMR6V3107M5X5
24x 3.3KΩ resistors, Multicomp MF12 3k3
7cm of 20AWG wire




Details of the circuit are available from the ananas product page, but here’s my transcription (I tend to do this just to ensure I understand the circuit properly).



Testing the circuit on a breadboard:


the finished build:


A Chirping/Beeping Customisation

.. just because;-)

A simple little piezo chirp circuit embedded in the pineapple..



Building the chirp module..


The finished chirp module.. shades of Empire Strikes Back?


Installed in the ananas:


Credits and References

Project Source on GitHub Project Gallery Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects. Two main themes have emerged in recent years, sometimes combined:

  • electronics - usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.