Power supply help needed (noob)

Discussion in 'Power Electronics' started by cong, Mar 6, 2017.

  1. cong

    Thread Starter New Member

    Mar 6, 2017
    Hi all!
    Starting saying that I have very few notion of electronics (I work a lot with arduino and stuff but nothing more than that) so please be kind and patient. :D

    So, I need to build a power supply, I need various voltages out of that for many audio equipment and I need space, so I can't use all the original suppliers from the manufacturers.
    As I said I already have a small knowledge on circuit building, since now I always used low voltages on cheap equipment but now I don't have to power a 40€ Arduino anymore but 3k of extremely delicate sound equipment and I also I have to work with a lot higher voltages so I would like to not kill my equipment or myself (in that order).

    What I need:
    -Possibly a power supply that can work both on 110v and 230v.
    -A lot of power.
    -These voltages: (the ampere are a bit over the actual maximum need of the equipment)
    9v (4 socket, 2A tot)
    12v (2 socket, 2A tot)
    15v (4 Socket, 4A tot)
    -Protection on the outputs for over-current and short circuit.
    -Thermal protection on the power supply.
    -Extremely clean and stable power
    -Extremely low noise on the circuit and on the equipment.
    -Extremely isolation between all the equipment.

    What I would like:
    -A fan to cool down the case, but I a bit worried that can cause noise on the power, should I put some filter?)
    -A led for each output to show the presence of tension or a fault.
    -A switch for every output (not a really big deal)
    -Maybe a temporized turn on for the various voltages (Do I need it? when I turn it on I can achieve a stable power or that much load can lead to unstable voltages?)

    This is what I thinked:

    IEC Filter:

    (should I need a rectifier here? I should right?)

    Converter 110v/230v to 12v:

    Converter 12v to 24v: (I would need that only if I use Linear voltages regulator)

    Or use something like this:
    (but I'm a bit afraid of the noise from a switching supplier)

    Linear tension regulator: (here going from the 24v converter to 10 of these each regulated to he specific voltage)

    and here 10 different sockets for each power regulator.

    Can work?

    My questions:

    Why I should use a linear power regulator and why a step down?
    Es: http://it.rs-online.com/web/p/convertitori-cc-cc-isolati/1002643/
    with the step down I wouldn't need the 24v converter but are a lot more expensive.

    Thanks a lot in advance to everyone who will be so kind to help me!
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    Sounds like you need a switchmode psu, giving out 15V@10amp, then use two Lm2596 pcbs to drop down to 12v and 9 v.
    cong likes this.
  3. cong

    Thread Starter New Member

    Mar 6, 2017
    The Lm2596 looks interesting! do you have experience with that? any noise suppression to recommend?
  4. cong

    Thread Starter New Member

    Mar 6, 2017
    Ok, Here what I found that can give me 10A at 15v:

    This looks like a luxurious power supply, lots of protections and the integrated EMI filter looks interesting:

    Two pretty standard supply:


    Interesting, lots of protection here and an insulated 12v port for a fan which is extremely interesting, don't know the difference between those "open" or "closed" enclosures,

    Still really afraid by the noise those power supply can output,

    Do I need a single Lm2596 for each voltage?
    This wouldn't will share noise on all the equipment connected?
  5. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    The €44 one is the best, yes you will need a Lm2596 for each of the 12 and 9 v, you can get them ready-made pcb on ebay.