Did67 wrote:For a boeotian like me, can someone explain to me why and how there are 12 V AC LEDs
the led only is an electronic component which must be supplied at constant current, and not at constant voltage
a model of led which must function at 700ma maximum will make the tension which it wants according to the temperature, for example 2,85V
if we try to supply it with a voltage source set to 2,85V, just put 0,05v less so that the led goes out completely or 0,05V more so that the current increases and exceeds the maximum tolerable
there is therefore in the led bulb an electronic current regulator circuit
and to avoid having to spot the + and the minus the lamp generally contains a diode bridge which allows to connect in 2 directions, so also in alternative
and if the electronic regulator in the led lamp is effective over a fairly wide input voltage range the led lamp can be connected to alternating 12V more or less well regulated as we give to halogen
but I have never yet disassembled a 12V led lamp to know exactly what is in it
I just dismantled a 220V led lamp where there was a capacitor current limiter which I find very bad