I'm reading a bit on LV lamp dimming. It seems the switchers {"electronic transformers"] that drive 12v Halogens & LED's prefer Reverse-Phase dimmers. I'm not seen much of a write up on such but it appears that they turn on at zero crossing, and turn off mid-cycle. The Vizia VPE06-1L is one.
I wonder what kind of design they use; power FETs or ????
-- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close.......................... Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
Den fredag den 8. maj 2015 kl. 01.06.17 UTC+2 skrev David Lesher:
probably, I've seen several schematics for dimmers using either back-to-back fets or a fet and a diode bridge
-Lasse
An example:
Klaus
Good question. Some "old" dimmers will work with some new LED lamps. But the situation is a mess: old dimmers with dimmable LED lamps can sometimes start oscillating. And unlike incandescent and halogen bulbs, not all LED lamps are dimmable.
One can get incandescent dimmers for about $4 US. The LED dimmers are > $20 US. And even at that price, all combinations are not guaranteed to work.
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.