Originally Posted by brewhacker
Since you've already picked up the 1 A transformer, and if it fits I'd say there is no harm in being oversized.
Regarding the 0.45A draw, are you saying that your box is actually pulling 0.45 A of current ? What are you driving?
I think I measured .41 or .43 amps. The circuit was my pwm circuit powering a 12v computer fan. I set it to 100% and held the fan still with my hand to simulate a worst case condition.
Normally I would not run the fan a full speed for a stir plate (i would assume) and the fan would always be allowed to rotate unless the stir bar was massive or something. Under operating conditions I think I was drawing .3 amps at full speed.
If you think I could get by with a .45 amp transformer then I might take back the 1amp.... It is just so big and heavy.