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lol dont know cuz i am not a pro..audioguru
Why do people from a foreign country call an AC/DC power supply a "transformer"? A transformer does not have a DC output.
lets say 500ms is good enough.ronsimpson
"instantly" what does that mean to you. seconds, mS, uS, nS, pS? "0 seconds"?
doesn't the low voltage(secondary coil) stores some charge? If its because of the filter capacitor inside the adopter then i will just remove it since i have a big capacitor after my voltage regulator.When the power to an AC/DC power supply is cut, the low voltage AC from the transformer stops immediately. Detect its loss.
for 9V secondary adopters, place a 10K resistor across the electrolytic capacitor just after the rectifer9 full wave, or bridge. then on, after you remove the adopter from mains, the capacitor discharges thro' this resistor and the Led would be OFF much earlier .
if the sec of the transformer is say 9V,
the rectified DC after the capacitor filter would be 1.414 times the (V, under No load.
once we load it would come down.
say 12V DC,
i suggested 10K
the current would be 1.2mA =12V/10000
now wattage would be I^2 R = (1.44/1000000)*10000 =.0144watts
works out to less than few mWatts
So, don't fear
connect a 1/4 watt 10K across the capacitor.
If you remove the filter capacitor that smooths the rectifier pulses then it feeds the regulator then the regulator WILL NOT WORK!doesn't the low voltage(secondary coil) stores some charge? If its because of the filter capacitor inside the adopter then i will just remove it since i have a big capacitor after my voltage regulator.
It is called OHM'S LAW. Its very simple rules are the basics of electronics and you should learn them.Great nice maths...
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.
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.
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 adapter. Why does the name change to mean the same thing?
I have never called a guy a MATE because my wife is my MATE. (I have never been a sailor).