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.... because the negative side probably has better connection to Earth. Lightning takes the shortest route to the water which is usually via the engine and chassis.
Brian.
Simplest method as you don't have a method to display the resistor value is to make the 390R half of a potential divider and pass a small current through it. Then use a comparator to see if the expected voltage is being dropped. You can use the comparator output as a 'good/bad' logic output to...
The boiling water test might work but you would be measuring 100C vs ambient temperature rather than 0C. Obviously, you can mathematically adjust the figures but to measure accurately you have to at least subtract the measured temperature at the 'cold' end of the thermocouple wires. If you are...
There isn't much that can go wrong with a thermocouple! They should be near identical and accurate but check the manufacturers spec for linearity. Also make sure you are measuring them correctly, the connections between board and wires can make far more difference to the reading than the...
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The moderators here are all experienced in electronics and possibly also in manufacturing, we learn from reliable, trusted sources and from our own...
Noise will come from many sources, including pick-up on the probes themselves, especially when switch mode supplies are nearby. If that is directly across C5/C7 I wouldn't be too concerned because the regulators will drop and clean up the voltages leaving them.
Brian.
Purely a guess without seeing it in the flesh: is one side of your AC input grounded and your scope probe also grounded? If that is the case, you short out one pair of diodes by passing current through the ground wiring.
Brian.
Yes, IC is not produced by beta x IB, it is controlled by it. You cannot increase IC beyond what Ohms Law and the collector resistor will allow.
Brian.
Yes, you can, it is only as switch inside the IC. Things to be aware of though:
1. Normally when closed it will have some resistance, a direct link won't.
2. If the switch is normally open, it may be to prevent a collision of two signals or voltages, if you don't keep them isolated it could...
Just a guess based on everything else checking out OK: the feedback connection has come adrift on the resonator disk. You can check it by injecting your sine wave on the feedback wire, it should still make a noise but probably much quieter. Why 6.8KHz? these things are usually around 2KHz.
If...
LM35 measures the temperature,
Op-Amp can be wired as a comparator, (although a real comparator would be better)
Op-Amp output drives the transistor to operate the fan.
Look up "voltage comparator" to see how to wire it up.
Brian.
Unusually low frequencies for that kind of application but basically you need a 3KHz oscillator, mixer and a bandpass filter to remove unwanted products. In view of how close the frequencies are, I would choose a balanced mixer to eliminate the 2KHz and 3KHz component and a high pass or bandpass...
I agree, although I still think it is done in error but the modules your links point to just say "VCC" and I think it means 5V not 3.3V.
If you start with 5V, the diode and potential divider will produce around 3.3V at the battery, meaning no current is drawn from it while 5V VCC is present but...
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