The discussion revolves around the construction of a low voltage AC power supply using a transformer from a power brick. Participants explore the feasibility of modifying the power brick by removing certain components and connecting directly to the transformer leads. The conversation includes considerations for safety, specifically regarding fusing and power ratings.
Participants generally agree on the feasibility of the proposed modification, but there are varying opinions on the specifics of fusing and the importance of knowing the power ratings before making a decision.
Participants express uncertainty regarding the appropriate fuse rating and the implications of the power ratings on the safety and functionality of the modified power supply.
Individuals interested in DIY electronics, particularly those looking to create low voltage AC power supplies or modify existing power sources.
Bzap said:Hi - I'm just starting to build a few basic circuits and am looking to get easy access to a low voltage ac power supply. I pulled apart a power brick, and it only has 4 diodes, a cap, and a transformer. If I pull out the cap and the diodes and solder the cord to the leads on the transformer, I should get a pretty safe low voltage ac power source, right? What kind of fuse should I add, if any?
Bzap said:120 vac, 3.3vac
Bzap said:Says it's rated for 350 ma dc.
berkeman said:350mA at 3.3Vdc? That's a pretty small wall wart...?
I'd fuse the AC output a bit below the rated DC output current. That should have reasonable margin.