how to power multiple devices on one 12v dc power supply? Answered

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A)   So i'm upgrading my soldering fume extractor as the OLD model looks ancient.. the old model ran x5 12v dc fans with the following current rating ( 0.12A,  0.25A,   0.41A,  0.40A,   0.40A ) and 3 standard 5 mm led's.  POWERED BY 12v = 500mA DC power supply



B)  the NEW model will have x4 dc fans @ 0.41a          x1 12v 360 degree W5W led  0.41A           x6 5mm leds     x1 arduino Nano.

My questions are:

1) How did i power the OLD model (A) with that power supply. from my understanding if doesn't supply enough current. 

2) Can i power all the components in the NEW model(A) with a 12v 1A supply  and if not how can i power all these components from 1 plug?

thanks for your help

Discussions

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Downunder35m

Best Answer 3 years ago

1) No clue.
2) No
You need a power supply with at least 2.5A to be on the save side.
I don't know about your plug, but you simply connect all devices in parallel to the power supply.

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rickharris

3 years ago

Your understanding is correct, However what is written on the outside of a PSU may be very different from what current it can provide, it may be a standard unit de-rated on the label for a particular purpose or it may just have been quite hot!.

As Du35 says hard to know without being there.

Fact is that you need at least 2 = 21/2 amp.

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icey.hoodrickharris

Answer 3 years ago

does it make any difference if i wired my darlington TIP122 directly to +ve and the fans +ve connected to ground of the transistor?

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rickharrisicey.hood

Answer 3 years ago

As there is no mention of a Darlington transistor in the question i have no idea what this is or where it is.

Circuit diagram of at least a good full description required.

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icey.hoodrickharris

Answer 3 years ago

My apologies, in the future i will elaborate and give a full description. I am sending a signal from an arduino to turn the darlington on, turns out it either makes a difference or my soldering was terrible. In any case the issue i was facing has now been resolved. Thank you very much for your assistance, much appreciated.

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icey.hood

3 years ago

does it make any difference if i wired my darlington TIP122 directly to +ve and the fans +ve connected to ground of the transistor?

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iceng

3 years ago

I take it you did not measure the currents but were reading the fan ratings...

1) Possibly the old unit was pulling a vacuum which unloads the fans and they use less power.

2) No !

Downunder is correct about the power supply.