ADWSystems
Member
I have purchased a (Chinese) 12VDC 20A power supply from eBay.
One of these
https://www.ebay.com/itm/DC-Power-Su...2A-15A-20A-30A-Plug-Pigtail-lot-/401103056399
I don't have an oscilloscope to see how bad the voltage regulation and noise output is. I presume for the price, pretty bad. BUT if the power supply is used to "convert" 120 VAC to 12VDC (as it does) and the 12VDC is then used to drive a linear step down voltage chip (such as a 7805, NCP1117, or similar). Would the poor regulation and/or noise be passed to the output of the second stage and the final voltage?
P.S. Yes this is the same power supply as listed in the diaphragm pump thread, but I'd like to discuss its use in a different application. The power supplies are pretty inexpensive as long as they are usable.
One of these
https://www.ebay.com/itm/DC-Power-Su...2A-15A-20A-30A-Plug-Pigtail-lot-/401103056399
I don't have an oscilloscope to see how bad the voltage regulation and noise output is. I presume for the price, pretty bad. BUT if the power supply is used to "convert" 120 VAC to 12VDC (as it does) and the 12VDC is then used to drive a linear step down voltage chip (such as a 7805, NCP1117, or similar). Would the poor regulation and/or noise be passed to the output of the second stage and the final voltage?
P.S. Yes this is the same power supply as listed in the diaphragm pump thread, but I'd like to discuss its use in a different application. The power supplies are pretty inexpensive as long as they are usable.