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  • Member for 11 years, 8 months
  • Last seen more than a month ago
  • Berlin, Germany
27 votes
3 answers
64k views

What does it mean when multimeter accuracy is marked as: ±0,03%+10Digit?

14 votes
4 answers
60k views

if a standard three-phase 400V AC connection is rectified what DC voltage comes out of it?

14 votes
4 answers
63k views

how can I try to revive this AGM deep-cycle battery which started to perform dramatically below specifications?

13 votes
5 answers
67k views

how to measure the internal resistance of a voltmeter?

13 votes
6 answers
36k views

which kinds of electrical equipment need a pure sine wave inverter to work correctly?

11 votes
9 answers
7k views

how can I make a large transformer less loud?

10 votes
2 answers
7k views

will a circuit breaker designed for 230VAC work for 12VDC?

8 votes
6 answers
21k views

what size of copper wire can act as a 150A fuse?

7 votes
6 answers
2k views

how do energy consumption (Ah, kWh) meters work?

7 votes
3 answers
2k views

is it OK to stack several DC-DC converters with their inputs connected in series to support a larger input voltage?

6 votes
4 answers
11k views

how to build a low-voltage disconnect switch for DC 12.4V 70A?

5 votes
2 answers
2k views

what does "70A moy/arit 90A eff" on a high-current automotive lead-acid battery charger mean?

5 votes
4 answers
2k views

is it possible to install some device which will measure in real time the torque my diesel engine is providing at the moment?

5 votes
2 answers
3k views

is it possible to repair a DMM which was burned by putting the leads into 230V on a frequency-measuring setting?

5 votes
3 answers
20k views

is there some sort of paste, grease, spray or similar thing that helps make more contact surface for high-current battery?

4 votes
5 answers
10k views

how to build a high-power (4kW) switched-mode DC-DC converter?

4 votes
1 answer
2k views

how to modify a taper charger of lead-acid batteries to be a constant current charger?

1 vote
2 answers
345 views

Is it a good idea to make a second DC installation in a car with its negative separate from the car body?

0 votes
2 answers
123 views

What is the difference between an 230V/120V AC automatic voltage regulator and a step up / step down voltage transformer / converter?

0 votes
3 answers
7k views

How to make two isolated power sources from one source?