Thanks for the replies but:
Concerning the LM317; maximum input voltage 40V so direct connect to mains is impossible
Those little black boxes (35*32*20mm error in first post ) comes from a lamps showed in attached file. I can assure you there's no transformer in it. So how do they do it with no heat dissipation?
You are not going to believe this but about two years ago, I bought
an entire box with prototypes from Massive at a local fleamarket for
50 cents each. The 16 leds were on a double sided pcb's with a little
black box attached to it. The pcb's had all different shapes and the
leds were in all sorts of different arrangements. I had at least 50 of
them and I sold them all at the next radio rally for 2 euro's each.
I can't remember if the leds were connected series or in parallel.
I was wondering if the leds are individually accessable ?
@on1aag
Indeed PCB with 16 led's in parallel ?!?
Constant currenty supply with led's in parallel; isn't that a bad design?
How do you control the current through each led?
Did you open a driver or not? Any idea what components are involved?
I think Massive put some prototypes in production
@justDIY
Thanks for the Supertex device.
Datasheet and application note's have always led's in serie, original PCB from Massive is parallel. Did you ever use a HV9910 with led's in parallel?
I can off course make a new PCB
I have no idea what's inside the black boxes, mine all worked and
I didn't pay much attention to it at the time. And as I already
mentioned in my previous post, I've sold them all.
But if you have some defective ones, you could use extreme
violence to get one of these mysteries open.