Why do people from a foreign country call an AC/DC power supply a "transformer"? A transformer does not have a DC output.
Why doesn't he know that it has a filter capacitor inside that "takes time to loose (spelling error for lose) all the stored energy" as it discharges.
A circuit could be added that quickly detects that the low voltage AC from the transformer has stopped.
Why does everyone call a transformer power supply, ADAPTORS?
Go to Radio Shack or anywhere an ask for a 120 VAC to 9VDC power supply. They look at me like I'm stupid then tell me, We don't sell power supplies. Yea right.
30 years ago it was power supply, now the same thing is abaptor. Why does the name change to mean the same thing?
My Aunt was a nurse for 40 years. She liked to tell the story about how every 5 years the names of things changed because someone higher up decided it sounds better. In 1942 if you were sick at your stomach you threw up, then a few years later it was called vomit, then puke, then whale, then barf, then up chuck, then spew, then earl, then ralph, then you lost your lunch, then something else. LOL. STUPID!!!
If you put a relay and resistor across the output of your, (Transformer, Adaptor, Power supply) it will discharge the capacitor when it is turned off. The resistor ohms determines how fast it discharges.