Timeline for Why is this power adapter transformerless?
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
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| Jan 24, 2017 at 10:51 | comment | added | Agent_L | Most SMPS do contain a transformer. A tiny, very efficient, high-frequency transformer. | |
| Jan 23, 2017 at 22:33 | comment | added | My Other Head | @marcelm, I agree. I've done some more reading and will rectify my error when I awake. | |
| Jan 23, 2017 at 22:29 | comment | added | marcelm | "If I've read the board correctly, ... then rectifies this still AC voltage and smooths it out with a whopping big capacitor (orange-red component)." - The capacitor is in series with the resistor; it's a capacitive dropper. This is a legitimate way to make a low-power power supply in some circumstances (but not this one, IMO). | |
| Jan 23, 2017 at 21:37 | history | edited | My Other Head | CC BY-SA 3.0 |
...use it for parts...; parasitics, para 4 line 1 add "as"
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| Jan 23, 2017 at 21:31 | history | edited | My Other Head | CC BY-SA 3.0 |
...use it for parts...; parasitics
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| Jan 23, 2017 at 21:31 | comment | added | Jim | I throw it away because it was not charging the lead acid battery, maybe lead acid battery was dead. When I measured the output voltage it was 220V without the battery and 6-8V with the battery on charging mode | |
| Jan 23, 2017 at 21:28 | history | edited | My Other Head | CC BY-SA 3.0 |
...use it for parts...
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| Jan 23, 2017 at 21:10 | history | edited | My Other Head | CC BY-SA 3.0 |
"EDIT" para ; typos
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| Jan 23, 2017 at 19:10 | history | edited | My Other Head | CC BY-SA 3.0 |
margins; time drift para; deep six
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| Jan 23, 2017 at 18:55 | history | answered | My Other Head | CC BY-SA 3.0 |