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An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.

2 votes

A short produced from an isolated power supply would like to travel to ground?

"Can a short produced from the isolated power supply would rather like to travel to a conductor that is connected to ground" is this a valid statement? It is not syntactically correct, so it can't b …
Wouter van Ooijen's user avatar
1 vote

Is the 5 V rail of an LM298 reliable?

The LM298 module has an 78M05 regulator in DPAK, without extra cooling. The 78M05 has a junction-to-air thermal resistance of ~ 100C/W, so for a 100C rise in temperature it can dissipate 1W. With 11V …
Wouter van Ooijen's user avatar
4 votes
Accepted

Why can't you just reduce the current instead of the voltage?

Your approach (10V and 2 Ohm series resistor) works (only) for a circuit that draws a constant current of 2.5A at 5V. When the circuit draws more or less current it will see a voltage different from …
Wouter van Ooijen's user avatar
3 votes
Accepted

What is the physical meaning of resistance and power ratings of a loudspeaker?

The specified impedance is the sort-of average over the relevant frequency range for the speaker. Googling for "speaker impedance" shows a few graphs. The impedance consists of an ohmic part and a muc …
LorenzoDonati4Ukraine-OnStrike's user avatar
1 vote

Power Supply for ESP12F WiFi Module

3.3V, 500mA should be enough. But ... when you doubt whether that ESP module requires constant voltage or constant current, I seriously doubt whether you are the right person for the job.
Wouter van Ooijen's user avatar
19 votes
Accepted

USB with only two leads?

Sadly, this seems to be common: USB cables that carry only power. To my knowledge that is not according to any USB spec. And it is quite frustrating because such a cable has no marking to distinguish …
Wouter van Ooijen's user avatar
24 votes
Accepted

Why are charge pumps only used for low current applications?

There are two problems with your idea. One practical, and one fundamental. The practical problem is that per amount of stored energy capacitors are more expensive than inductors, and on top of that t …
Wouter van Ooijen's user avatar
4 votes
Accepted

Capacitor replacement - different uF value

Electrolytic capacitors have a very large value tolerance, -30/+50 % is not uncommon, so your small in crease in capacity is unlikely to cause a problem. And you have matched the temperature rating to …
Wouter van Ooijen's user avatar
3 votes
Accepted

In the given circuit of a regulated power supply, why is error computed twice, i.e., before ...

It doesn't. A1 at the secondary side computes the error, and transfers it to the primary side using the optocoupler, which is used to pull the Vref lower, to decrease the activity of the PWM circuit, …
Wouter van Ooijen's user avatar
4 votes
Accepted

Power Supply Sees Electromagnet as a Short Circuit

Like many 'output' devices, a coil for producing a magnetic field has a (DC) impedance. This impdance, in combination, with the applied voltage, determines the current, and current and voltage determi …
Wouter van Ooijen's user avatar
2 votes
Accepted

I don't understand transformer power ratings

I guess your wall wart is a switching power supply, which can use a high-frequency transformer. In search for a transformer for your own design, you aere looking for a 50/60 Hz transformer, which need …
Wouter van Ooijen's user avatar
0 votes

Periodicity of sinewave

The statement "sine wave repeats itself after every \$2 \pi\$ interval" refers to the sine wave, defined by sin(t). You must always pay attention to the context in which such a statement is made, in p …
Ricardo's user avatar
  • 6,204
8 votes

Whats the point in conserving electricity if the AC current produced cannot be stored?

If it is not consumed it does not need to be produced, which saves on whatever is consumed to produce it. This of course works only if the production level can be changed rapidly, hence the electricit …
Wouter van Ooijen's user avatar
3 votes
Accepted

Can I reasonably expect a USB connection manage a 3.7 Volt 6-8 Watt output at 1.9 Amps or less?

I don't have the faintest idea what an "510 Vape eCig mod" is (glow plug model car??). But NO, from you specs this is not something you can expect an USB connection to do for you, because An USB ho …
Wouter van Ooijen's user avatar
1 vote

Why does my laptop adapter output nominal voltage with a broken capacitor?

In general you can't assume that a failed component will cause a failure of the overall module. In your case: Your multimeter can only give you one value (a sort-of average), it can't tell you whe …
Dave Tweed's user avatar
  • 178k

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