I connected a segment of a led strip (12v) to a line coming from a standard ATX PSU (12v line, of course). I just wonder if it is safe to put a toggle switch to turn on/off the led strip, or may be this really simple circuit requires additional components. I should say the ATX PSU is actually powering a PC and I want to power also the led strip, and turn it on/off while pc (psu) in on.
This should be fine.
- Generally the +5 V or +3.3 V line is accurately regulated and the +12 V (and -12 V, if provided) are relying on the turns ratio on the SMPS transformer to keep them in proportion to the 5 V supply.
- Watch your current. The 12 V rails were only designed for hard drive motors which are not high power. The PSU label should give you the limits.