Well, the first shipment of toys came in, and I've got a stumper..
I picked up some meanwell ELN-60-24Ds, and I have a handful of LEDs, so I thought I'd wire up one, just to test.
According to the meanwell spec,
http://www.meanwell.com/search/eln-60/eln-60-spec.pdfWhen there is no signal sending to the control wires (open circuit between the two control wires), the power supply
unit will operate as 0V (D-type) or 0% duty (P-type) of input signal and hence the output current will be zero.
Except it's not.. I'm getting light even when there's an open circuit between the two control wires (I pulled my 10k pot out of the mix thinking I might have miswired it, but no.)
Any ideas?
edited to add: I think I have an overzealous LED.. the forward voltage on this one is typically 2.20v, but this one is firing at 1.73v.
I'm just surprised the meanwell would fire at all with an open circuit.
edited to add more: Apparently it's a known issue with the meanwells that you'll always get a dim glow, even with 0v on the control lines.