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New components and completion

· daryl

The following pictures show the new components and the completed board.

Capacitors

The above image shows the new and old Rifa capacitor. You can see the crazing and discolouring on the left hand side.

TRIAC

There was some difficulty in finding an alternative TRIAC. From the part numbers on the package, TAG D2 450 800 , I took a guess on the typical specifications as I could not find a vintage TAG Semiconductors parts catalogue. I used a ST BTA16-800CW with a blocking voltage of 800V and an RMS current of 16A.

Finished PCB

The motor is now working well unloaded and is surprisingly loud at max speed (28,000 rpm).

Watch this space for a reverse engineered circuit diagram.

Battery Mount

· daryl
Downtube Battery

The 15Ah battery comes with a rail for mounting on the downtube in place of a bottle cage. However none of the precut slots matched the screw bosses on my frame so I had to drill an additional hole. Due to the tradiational bottle cage bolt spacing this leaves the top of the battery without a firm mounting so I shall 3d print a clamp.

2017 Winter Update

· daryl

The updates have been sparse but here is a brief list of what I’m working on.

  • Final Year Engineering Project – Building a low cost bicycle power meter.
  • Vintage Bicycles – Restoring an Orbit Gold Medal and a Holdsworth Triath-Elan.
  • Railgun – Still in early design stages, this has taken a backseat.

I hope to write a longer post soon with more details on the low cost power meter.