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Rupert will make his way through cable locks with his shears. I'm thinking of leaving the airplane in Santa Monica for a few weeks, to let Bill Heard make a bunch of more substantial modifications to the cowl. A huge number of people have passport and utility bill scans in their Dropbox - again, behind the same email and password they use everywhere. In other contexts you might also want to detect them, delay them, alert the relevant people and perhaps even respond somehow. Get an alert when I write something new, by email or RSS . The BC337 transistors get about 2 mA of base current through the 2.2K resistors. I may have to replace the aging suction pump in order to get IFR certification. Interestingly, the digital gauge indicates from 2.3-5 psi, depending on throttle position and whether the electric fuel pump is running. It indicates that the oil is somewhat hot, but not at red line. But the original gauge indicates 4-5 psi regardless!

But the new gauge, which I trust, shows that the old gauge is ridiculously inaccurate. A current transformer doesn’t like to be open circuited. A current on the primary is therefore induced onto the secondary albeit at a magnitude proportional to the turns ratio. On the secondary we have many turns - 100s of turns. I have settled on KiCad because it is open source and you can do multi-layer PCBs if you need to. On researching the topic further I found an open source charger (the EVSE) with good documentation. EV chargers use a simple "pilot" signal to detect when they are plugged into a car and to tell the car how much current it is allowed to draw from the charger. Read here and here for descriptions on how this signal works. All communication with the car is done through a single wire referenced to earth called the pilot signal. The earth supply comes from the consumer unit (we have TN-C-S supply).

Either way the live will source current into the chassis which will drain straight to ground (In a TN-C-S supply the ground and neutral conductors are bonded at the consumer unit). 10 V so I burnt one out whilst adjusting the supply rail voltages. The regulators are operating uncomfortably close to their dropout voltages. A 13.6 V 600W bidirectional TVS just ensures no whacky voltages are ever experienced on the pilot wire. The relay resistors are dissipating 900mW (They’re 1W rated) which gets them to about 60 celsius above ambient. It seems to take about 5 ms to actuate the relay. But getting approval for all-electric gyros is likely to take some time. I haven't had the chance to take any long trips since then. Then in the past few weeks the oil temperature began to indicate red line! Then there's the engine upgrade, paint, and interior. Evidently there's plenty of pressure to run the engine. I bought 5 metres of 6mm² SWA cable to run from my consumer unit to my desired charger location. The SWA cable enters the Zappi enclosure through an outdoor water resistant gland. I built my own 7.2kW EV charger and fitted it inside a Zappi enclosure.

I managed to buy a second hand "showroom" Zappi charger. I will have to remove the charger when I leave my house. We can’t afford to not do anything about it, so we have to force the issue into the priorities of our government and the energy companies. In the UK our system was built in the 1960s to have a lifespan of 40 years, we’ve outgrown it. I took some thermal image pics of the system operating at 30A and there are no hot spots in the solder/wiring/connections. I have learnt about earthing systems, PEN faults, RCDs, cable current capacities etc. I think I have educated myself enough to have built an adequately safe system. Imagine if the current transformer forces 50 uA towards the V- terminal of U2. All in all, AC currents from the ground fault current transformer are converted into voltages, amplified, rectified, limited and filtered before being passed to the Arduino ADC for measurement. The amount of current will depend on the resistance of the faulty bridge. The reason RCDs typically trip at 5-30mA is because this amount of current for a couple hundred milliseconds doesn’t cause permanent injury to humans. A current transformer is analogous to a voltage transformer.

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