Help with DC power cable.

[loki]

Hi guys, I recently purchased a power supply with isolated outputs. So I thought about joining two or them to power up my EH effects.
So I built a Y cable and from the 2 12v outputs i managed to have 24v at the end of the Y plug.

Now, i built another Y cable because i want to power two pedals from that source (i checked the mA requirements of both of them)
so here's a schematic of what i've done...


12v      12v
  |         |
  ---------
       |
      24v
       |
  ----------
  |         |
24v      24v

Now, I can get a reading of 24v on both the plugs, when i connect one plug to one pedal it works, but when i connect the 2nd plug to the other pedal the first pedal shuts down... Now im pretty confused... should i connect the two pedals with a daisy chain instead of the Y cable?
Thanks

[Processaurus]

Is one positive ground, and the other negative ground?  That will short out the power supply when you connect the grounds together via the patch cords.

Actually, I'm not sure how your 24v Y cable is wired, to work right both outputs should be wired in parallel.

[loki]

both the pedals are the same i guess, i could use the same power supply that came with them interchangeably, 24v tip positive sleeve ground.

and yes i wired it in parallel i think... two wires from one plug going to the two plugs
here's what happens, when i plug both of them one effect works and the other shuts down. if i pull out the plug from one of them, so that just the tip is attached, both pedals work but of course i get noise from the pedal with half-in plug...
so i guess there's some problems on how to wire the ground connections i think...

[Processaurus]

Try this: plug in only your y DC cable to both of them, and don't connect them with patch cords.  If it doesn't short the power supply then it's a positive gnd negative gnd pileup, and nothing can help it beyond making seperate isolated 24v supplies.

[loki]

making seperate isolated 24v supplies.

that's what i ended up doing...
thanks anyway!