Question about dual (positive-negative) power supply board

[safe1]

Hi guys,

this is most probably a stupid question but i just want to be sure I don't mess anything up... 🙂

I built a dual (positive/negative) AC to DC power supply board using LM317/LM337 (it's that in the photo attached).

Is it ok if at any given time I use only the positive output of this power supply
to power a device or would that be a problem for the circuit ?

 

[JonSnell Electronic]

Schematics ... would be conclusive ... but .. it will probably be OK.

 

[safe1]

Hi JonSnell,

When you have time, I have attached the schematics... 🙂

 

[thimios]

You can use, only positive or negative side without any problem.

 

[Mark Tillotson]

Is it ok if at any given time I use only the positive output of this power supply
to power a device or would that be a problem for the circuit ?

Yes, most amps pull from rails in an alternating fashion when there's a signal, even opamps, so the PSU has to be able to handle each rail independently.


A really good supply will have a protection circuit that switches off both rails if either fails / goes under voltage, but otherwise consider it to be two power supplies.

 

[safe1]

thank you all.