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/diy/ - Do It Yourself

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164609 No.164609 [Reply] [Original]

pic related to my question. Can i?
It's for a Yamaha PSR-290 (synth) keyboard, confirmed to be drawing maximally 700mA current.
The adapter on the right is confirmed to work fine, the adapter on the left is the one i'd like to use from now on.

>> No.164614

>>164609
Yeah you should be able to use it. The amps are a little high though.

>> No.164615

>>164614
That's one of the things worrying me, what could happen?

>> No.164617

>>164615
If it has a fuse the fuse will blow. Hopefully, that is all. Otherwise, it'll run warmer. You could try coiling one side of the wire or something and testing the output with a multimeter to know how much it changes the volts and amps.

>> No.164625

The fuse on what?

By coiling one side of the wire, you mean open the adapter and work on the transformer?

>> No.164628

>>164625
A fuse in the keyboard.

The wire I mean is the wire from the adapter to the keyboard. Split it down the middle in one section without exposing the inner wires. Then wrap one around a pencil or something similar.

>> No.164632

>>164617
>>164614
Sorry anon, but you don't know what you're talking about.

The adapter won't magically force more amps into your keyboard. 1.66A is the MAX current it can supply. The keyboard draw the same amount of current as it always does.

Polarity is the same, voltage is the same, and it can supply enough current. That adapter will be fine OP.

>> No.164639

Well, thanks for all your help for now.
Still monitoring the thread, just bumping actually

>> No.164642

>>164614
>>164617
wtf guys!
I don't want to sound mean but if you 're not sure about something don't give advice on it!

The adapter (VOLTAGE SOURCE) will provide the voltage and the current will be determined ONLY by the load. The current value on each adapter is the maximum current it can supply to your device without it's voltage output dropping below a certain level.
Both adapters will work the same and will provide the SAME CURRENT to your load.
MAYBE you'll be better off with the new adapter (left one) because it won't work near its limit and it may be work more efficiently.

>> No.164643

No problem, it would only be problematic if the device at hand would draw MORE than the supply can supply (hurr)

>> No.164699

Think of it like this:

A power supply does not push current into a device.

A device pulls current out of a power supply.

>> No.164713

>>164699

but that would be like me sucking out water from a faucet

that doesn't make any sense

>> No.164776

>>164713
it makes sense to me what he said, all the adapter is doing it resisting current to a specific limit to what can go through it. That and converting AC to DC. The circuit that comes after the adapter will determine the amount of amperes drawn for it to function.

>> No.165421

bump

>> No.165427

>>164713
think of it more like a free refill glass of water with a straw. You suck up what you want and the waitress constantly refills the glass to make sure you have more than enough to quench your thirst.

>> No.165437

>>164713
water pressure = voltage
amount you open the tap = amperage

>> No.165454

>>165437
Water is not electric and you can not draw a proper simile between them.

>> No.165465
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165465

>>165454
Actually that was a pretty good analogy. Opening the tap is equivalent to lowering the resistance.

The math that describes fluid flow is very similar to the math that describes current flow (at least according to my mechanical engineer friends. I'm an electrical).

>> No.165472

>>165465
No, it's not a good one at all. It only confuses people with misinformation and makes them look like an idiot when they try to repeat it to people that know what they are trying to talk about.

>> No.165485

niagra falls is putting one zillion mega amps. i walk up to it with a straw and insert the straw into the stream and gently suck out 1 milliamp of nasty water.

im just a device pulling in what i need, though the stream is capable of more.

i see what yall mean now and im a gardener

>> No.165506
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165506

>>165472
What misinformation? Can you explain why it's a bad analogy without using the reason "it's a bad analogy".

>> No.165569

all analogies are bad
X is an analogy
-----------------
X is bad

Modus Trollens

>> No.165630

OP here, it worked.
There is background noise when using bad sound output cables, but i don't think it's related to my op question.

>> No.165677
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165677

>>165630
Word.

Now post an amazing original synthesizer composition OP!

>> No.165713

>>165630
A power supply is certainly capable of causing background noise.

You have a switching power supply. In layman terms, it effectively works by switching on power to charge a capacitor (similar to a battery), switching off power until the capacitor has been drained a tiny bit, switching on power to charge the capacitor again, and so on... thousands of times a second. The tiny variations in voltage are at frequencies that can be heard if allowed to propagate through the audio amplifier.

>> No.165748

>>165713
This can be reduced by coiling the a few times wire though a torrid right?

>> No.165765

>>165748
The noise from switching power supplies is a bit tough to remove.

Even with Alinco's RADIO 12v switching power supply, they couldn't get rid of the noise. So they added a knob so you can "move it out of the way". lol.

Well engineered power supplies usually generate almost no RF noise.