How do I connect the led to the 12V AC?
Suggest you take a bridge rectifier circuit with IN4007 (without filter), the light emitting diode series anode connected rectifier circuit is output, negative negative output rectifier circuit connected, so it is safe to use, but also can not increase cost.
Connect it to the AC circuit, you can not consider the zero FireWire, nor consider the positive and negative poles, but you are in series when you want to split the positive and negative poles, as well as reverse voltage, may burn out light-emitting diodes.
In theory, the light-emitting diode itself is also diode, also has one-way conductive properties, that is, with rectifier function.
