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To answer what is probably a hypothetical qustion, two 12V car batteries in series would provide 24V with enough current capacity. Wires of cross section 2.5sqmm would carry the 24A without any issue.
This makes me hungry - I think there's a bread crust somewhere that I can scorch by radiation...
It is convention to put the letter/symbol for the multiplier/scale factor in place of the decimal point. This is to ensure clarity where schematics are copied and decimal points could be overlooked. So:
0R15 = 0.15 Ohm
4k7 = 4.7k, 4700 Ohms
6M8 = 6.8M, 6800000 Ohms
1V6 = 1.6V
2n2 = 2.2nF
4u7...
If you had transposed pri and sec it would have blown a fuse somewhere (the sec wouldn't cope with the high voltage).
The primary is not polarised. It doesn't matter which way round it is connected.
You don't say why you changed the tranny in the first place. If it was because the original...
The clocks that used mains frequency for timekeeping were referred to as "synchronous". They are rather old-fashioned and had a small synchronous motor inside, hence the direct correlation with supply frequency.
If by "digital clock" we are referring to a clock with digital display, it may...
Re: Need advice - DC current on exposed metal of LCD televis
Try unplugging the powered aerial to eliminate that. Though you say it is unearthed, it could, by poor design, be presenting a voltage to what should really by a floating ground of the TV.
If you can feel the voltage, it could be...
If both power tools are single phase, here's a possible solution.
Acquire a couple of three phase motor starters, maybe from scrap/junk. These have a relay with three contacts, start and stop buttons and provision to wire external start/stops.
In starter 1, wire live through first contact to...
Operating voltage of 10.7V to 32V sounds like it's designed to be universal for boats that are either 12V or 24V (hence the nominal rating) without having to have a voltage selector. I'm sure it will be fine powered from your 20V supply.
3phase
Re: resistor doubt!
True, the resistor resists but its real effect is to cause a voltage drop. With the resistor in series with the motor, the voltage dropped across the resistor will depend on its value and the effective resistance of the motor. I say effective resistance because it isn't...
The motor rated at 7.5kW equates to about 10 horsepower in old money. That size of motor needs a starter. This is a type of relay that incorporates an over-current trip. The type of starter I am familiar with generally has a start and stop button incorporated. You can wire external...
Re: Voltage drop ...
You didn't say, but if you are trying to interface to a PC, there's a regulated 5V and 12V in there, available on any socket that is provided for hard drives, CD drives, etc. Just a thought.
Failing that I'd concur with previous posters, i.e. 7805. Be aware that if...
In regard of time to charge, the voltage across a capacitor in series with a resistor will reach 63.2% of the supply voltage in a a time of R x C seconds.
For discharging (capacitor and resistor now in parallel), it takes the same time (R x C seconds) for the voltage across the capacitor to...
The cleaning method depends on what type of contact it is and how bad the connection is. Most connectors will be made from brass that is plated with tin, silver or gold. Using anything abrasive will wear the plating and possibly remove it. Bare brass will tarnish quite quickly in the...
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