Of course one needs to understand that trailing edge dimmers don't use triacs. Triacs are rather old technology, and not as cheap as IGBTs which are used for trailing edge dimmers. The leading edge ones tend to cause noises because they switch on (large current) at high voltages. Trailing edge switch off ( to zero current) at similarly high voltages. Less noise from magnetics, but potentially high spike voltages instead.
Of course one needs to understand that trailing edge dimmers don't use triacs. Triacs are rather old technology, and not as cheap as IGBTs which are used for trailing edge dimmers. The leading edge ones tend to cause noises because they switch on (large current) at high voltages. Trailing edge switch off ( to zero current) at similarly high voltages. Less noise from magnetics, but potentially high spike voltages instead.
