[mb3k]

Hey guys,
I require a +/-15V and a +5V supply and I drafted a circuit but I need some sanity checks before I implement it. The power supply is similar to the SOHA/SOHAII supply except for the full wave rectifier (D5 & D6 in my schematic) is pointing in different directions compared to the SOHA. Please note I will be using a center tapped transformer, connecting the center tap to GND.

What I'm wondering:
Is the orientation of D5 & D6 is correct for a LM317 regulator to give positive 5V?

If you catch any other odd mistakes, let me know!

 

[FallenAngel]

D5/D6 to ground looks VERY funky, your ground doesn't look like it's correct, but that's coming from somebody who doesn't understand half-wave rectification.

 

[nux]

Yes that looks fine. Just beware of the power loss on the LM317. C1 - C4 are unnecessary.

EDIT: Just looked at the SOHA power schematic, very strange using an LM337 to produce a -12.6V supply.. But the diodes in that are correct to produce a negative supply to the LM337, and yours are correct to produce a positive supply to the LM317.

 

[cetoole]

What is the point of D5/D6? I would just use RECT1 instead, as it is the same thing.

 

[mb3k]

Quote:

Originally Posted by cetoole /img/forum/go_quote.gif What is the point of D5/D6? I would just use RECT1 instead, as it is the same thing.

Good point, that makes things a lot easier and two less diodes to worry about!

 

[Fred_fred2004]

Jaycars do a kit for a power supply that sounds like what you are after,

it might give some ideas
cheers
Fred

 

[mb3k]

I'll be integrating the power supply into a PCB that I'm making.
The Jaycars kit gives me an idea of the layout and such for the PSU part of it. More on the actual board purpose later...

 

[DaKi][er]

You got not ground return back to your AC, needs a centre tap like the jaycar schematic, else I don't see anything else wrong