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Day: 2019-07-19

Sending engine RPMs to the NMEA bus, 1/x

Whilst Dad was visiting, we put his portable oscilloscope across the two terminals on the back of the tachometer, and found a very nice mV signal that changes frequency with engine revolutions. This means that a bit of circuitry plus

Duncan 2019-07-192019-07-30 Code, Sailing Read more

Finding the right cable size for the water pump

Finding the right cable size for the water pump

Given the voltage drop at the pump, yesterday evening’s project was to wire the pump with 8 AWG (10mm sq) for the positive feed, and a bit of 2 AWG (35mm sq) for the negative feed. Unsurprisingly, the pump worked

Duncan 2019-07-192019-07-19 Sailing Read more

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