bm@bike2work.Eng.Sun.COM (Bill(Francis) Michel) (03/02/91)
I want to build a power supply for a halogen lamp that uses 55 watts. This is a 12v lamp. THis means somewhere around 4 amps, right? But when I go to buy a transformer, the ratings they give (in amps) apply to a certain number of amps, but I'm not sure whether that means through the primary or secondary windings? Can someone clear me up on this? If it's through the primary, how do I calculate the needs of my system, given what I know about the secondary circuit. Thanks Bill -- Bill Michel bm@eng.sun.com These views are my own, not Sun's.
verive@tellabs.com (Jeff Verive) (03/03/91)
In article <8927@exodus.Eng.Sun.COM> bm@bike2work.Eng.Sun.COM (Bill(Francis) Michel) writes: >I want to build a power supply for a halogen lamp that uses 55 watts. This >is a 12v lamp. THis means somewhere around 4 amps, right? But when I go >to buy a transformer, the ratings they give (in amps) apply to a certain >number of amps, but I'm not sure whether that means through the primary >or secondary windings? > >Can someone clear me up on this? Transformers are rated in secondary amps (BTW, 55W/12V is more than 4A, and it's not a bad idea to be conservative with transformer ratings. Helps keep them cool and happy.) -- **************************************************************************** ** Jeff Verive | If they ever stop making those little candy flowers ** ** 259371048378 | for birthday cakes, I shall lose my will to live. ** ****************************************************************************