bigegg
Scream Not Working Because Space Make Deaf
- Messages
- 9,459
- Location
- Leeds, West Yorkshire
just tested with a sacrificial led.
it lights by just being placed across the output terminals, without any resistors.
it will also light a "12v led tape" with 25x 144mW lamps on it.
(which unfortunately takes too much room for my project)
so , Ami correct in my assumption that I use Vf to calculate the maximum number of LEDs I can power from one driver?
I basically want to convert some fluorescent fitting to use LEDs, and want as much light as possible from it.
I have ten of these drivers, and about a thousand LEDs.
I'm making a custom shaped mounting board to hold them.
I just need to know how to wire them.
series, or parallel, (or a combination?)
and how many per driver.
I have a decent multimeter that I can use.
but don't know what to measure!
it's the "constant current" bit that's confusing me.
if it constantly delivers 30mA, it will power only one LED.
if it constantly delivers 30mA per LED, how does it know how many LEDs?
because they're in series and it "detects" the voltage drop?
that means the output voltage would have to be 90v ish for 30 LEDs
if they're in parallel, then the voltage drop would be 3v(ish) so how does the detector know how much current to supply.
and if it outputs a different current, it wouldn't be a *constant* current supply.
aaaargh.
I'm going back to my double entry book-keeping homework.
it lights by just being placed across the output terminals, without any resistors.
it will also light a "12v led tape" with 25x 144mW lamps on it.
(which unfortunately takes too much room for my project)
so , Ami correct in my assumption that I use Vf to calculate the maximum number of LEDs I can power from one driver?
I basically want to convert some fluorescent fitting to use LEDs, and want as much light as possible from it.
I have ten of these drivers, and about a thousand LEDs.
I'm making a custom shaped mounting board to hold them.
I just need to know how to wire them.
series, or parallel, (or a combination?)
and how many per driver.
I have a decent multimeter that I can use.
but don't know what to measure!
it's the "constant current" bit that's confusing me.
if it constantly delivers 30mA, it will power only one LED.
if it constantly delivers 30mA per LED, how does it know how many LEDs?
because they're in series and it "detects" the voltage drop?
that means the output voltage would have to be 90v ish for 30 LEDs
if they're in parallel, then the voltage drop would be 3v(ish) so how does the detector know how much current to supply.
and if it outputs a different current, it wouldn't be a *constant* current supply.
aaaargh.
I'm going back to my double entry book-keeping homework.