low voltage supply

ANY Timer Switch
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Fun1 asked What are the advantages to using a higher or lower voltage in electronics?

Like when you have a AC/DC converter pack, why do some of them change the voltage to 2.4V and others to 3.2V or another number? What are the advantages and disadvantages to running higher and lower voltage in certain electronics? Why don't they try to make things as universal as possible?

And got the following answer:

Quote: "Why don't they try to make things as universal as possible?" ► To a certain extent, this is done: +12v d.c. being the commonest of all, with 9v and 6v coming shortly after. However, sometimes the electronics that is inside the box & cost considerations demands that a different voltage is required. There are many reasons for this. 1. It may be cheaper to design the product using a lower voltage. 2. A lower voltage often results in a physically smaller item. 3. The item may be required to run from its own internal batteries on occasions - so an external 3, 6 or 9v. external supply is then necessary. 4. Many modern electronic components are low-voltage devices ~ like 2.4 v d.c. ~ so that determines the PSU voltage. 5. For a given size of load, power dissipation is proportional to current squared. Hence, by doubling the voltage and halving the current, the power required is the same, but the power losses become much less - resulting in a design that is much more power efficient - and therefore runs cooler - and therefore lasts longer (Heat slowly kills electronics items). 6. The greater the current, the thicker the conductors need to be. These conductors are usually copper - which is expensive. And finally, and just to complete the 'story', when we get to really large voltages - say 300v and up, insulation & safety issues then start to have an influence on the design - in addition to those above. Aside. What I do find really annoying - way above what you have asked - is why do manufacturers not standardise on what part of the co-axial plug (that is on the end of these PSU units) is +ve and which is -ve? Logically, +ve should be the inner connection. If you guess - and your guess is wrong - chances are you'll destroy the item that the PSU is connected to. Then there are those awful 'wall-warts' that don't even tell you which is which! Fortunately, I can recognise this scenario before it is too late - and find out what they have done - (see "source" below) - but for most people . . . . ? HTH. .


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