Products > Test Equipment
Cheap bench power supply?
KungFuJosh:
--- Quote from: shapirus on January 28, 2024, 10:52:04 pm ---Yeah it looks quite good, and it's btw a lot cheaper (about $35) on Ali. I might build a second unit to serve as a second channel, will see. However when you add the price of an AC/DC PSU... it may well be that getting the ready made one (I am sure they make ones already with a case and AC/DC supply) will cost the same, if not less, not to mention that it's easier. Building my first one was fun, but it was just enough of that particular kind of fun for me :).
--- End quote ---
Yes, I've seen it on Ali, and they do have readymade versions. There's also the RD6024 you can look for on there that has more power. The assembled version isn't that cheap though.
Wallace Gasiewicz:
It is possible to filter switching PS. But I have found it to be very difficult. In a switching PS there is both line noise and radiated noise. It is very hard to get rid of the radiated noise. Putting filters on the output of a PS (line noise) can decrease the volts and amps from that indicated on the PS meters They also inject noise into your house wiring.. Besides that the switching of the PS changes with amp demands of the circuit so the freq of the interference changes. The higher the power of the PS the louder the noise. It is a lot easier to get a quiet PS than to deal with all that.
If you are dealing with RF. there is already enough interference caused by your household appliances and computer stuff. The high power switching stuff in electric cars can make AM radio unusable.
There are many very good switching PS built for specific equipment. The harmonics or noise from these PS is such that it does not interfere with the intended load. An example would be radios like HAM transceivers. The PS are built so that there is no interference with any freq used in the radio.
If you are not going to deal with any radio stuff then I guess this is not as important, but for RF Hobbyist it is very important.
Aldo22:
What do you think of the measures shown in this video to reduce the noise?
He has almost the same device as me, so I would like to do the same if there are no objections. ;)
shapirus:
--- Quote from: Aldo22 on January 29, 2024, 10:03:48 am ---What do you think of the measures shown in this video to reduce the noise?
--- End quote ---
I loved his way of using the probe as a contactless sensor to find the source of EMI. Sweet! Live and learn.
BeBuLamar:
I don't know much but I bought the Matrix MPS-3605LP for $129 from Amazon and I am very happy with it. However, now i check the price is up to $250.
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