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If the motor is powered via a tapping on the heater element wire, the tapping connection may deteriorate when the element gets hot, hence reducing power to the motor.
I have single-focus lenses for distance vision, which are good for anything beyond about 1 metre. I use a few cheapo non-prescription reading glasses (£1.50 per pair from Poundland) of various strengths for any close work.
You can use LTspice to do various simulations, by using Voltage to represent e.g mechanical force, current to represent e.g. mechanical motion or heat flow, etc.
A chunky old-school transformer like you have is unlikely to fail unless something downstream draws excessive current. Have you ruled out all other posssible failure points? It would be a shame if a replacement transformer suffered the same fate.
From the LAFVIN tutorial it seems two 18650 cells in series (~7.4V?) are needed as the power supply, plus a buck regulator. The laptop USB port provides only 5V. Depending on the voltage and current requirements of the motors, ultrasound module and servo, the laptop current output may also be...
Get the Chinese supplier to ship the items to a penguin on Heard Island, then you can import them from there with only a 10% tariff and no minimum package charge :D .
Even if there is no alternator there must be a starter motor, so that running would provide one signal. A vibration sensor on the pump could provide another signal.
It depends on (1) how the switches are connected to the rest of the equipment, i.e whether they share a common ground connection (as shown in my schematic) or share a common high side connection and (2) whether the relay coil is being switched high side or low side.
Because U2a and U2b form a...
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