2amps DIY PSU

[Whoops]

Hi,
I need to do a PSU for an old 8 channels mixer.
The mixer needs a 2amp PSU.

Until now I've only did PSU's with Lm317/337 (1.5 amps max)  and 78xx/79xx (1A to 1.5A max depending on suffix)  types of regulators,.

What would you advise me as a possible DIY'able PSU to achieve 2 Amps?

thanks

 

[Rob Flinn]

I've done this using 2 separate PSU's using LM388 (5A version of KM317) regs.  I stack them to give the + & - .    i.e connect 0v to +v on the other PSU to give you the 0v/ground rail.    This is how it's done in the AMEK Einstein.

 

[bruno2000]

With all of the nice + regs out there, I agree, this is the way to go.  Never did trust a negative anyway...........
Best,
Bruno2000

 

[Whoops]

I've done this using 2 separate PSU's using LM388 (5A version of KM317) regs.  I stack them to give the + & - .    i.e connect 0v to +v on the other PSU to give you the 0v/ground rail.    This is how it's done in the AMEK Einstein.

Thanks I will check the Lm388 and how to implement it in a PSU circuit.
Never used it before.

I actually dont need negative rails,
I just need +22V at 2 amps minimum for the mixer and 48V for the phantom.
The phantom power feed is easy.

Is this IC as easy to implement as the LM317?

thanks

 

[Brian Roth]

I believe the correct part number is LM338.....

Bri

 

[Rob Flinn]

I believe the correct part number is LM338.....

Bri

I think you're right Brian, I get quite dyslexic with numbers.  When ever I visit RS with a list of part numbers I always seem to have one where I've reversed a couple of digits ..

 

 

[Rob Flinn]

Is this IC as easy to implement as the LM317?

thanks
[/quote]

The LM338 is exactly as simple to use as a 317.    You use pretty much exactly the same circuit, just sub in the 338.  There are plenty of circuits if you google.

I built a supply to feed 2 Lexicon LARC's built into a Hammond style cast aluminium box using these for a client.  They've been switched on for nearly a year now with now problems.  Just make sure you heat sink them.  In my case I just bolted them to the Hammond box with an insulating kit.