Ted. Best to box the PSU and silence the fan with sound deadening material without affecting airflow. In effect, creating a "silencer" for the air inlet, and maybe outlet.
For that sort of power level 500W and above, and the small size of those PSU's, the cooling is critical for a long life. So, the gutsy but noisy fan is there for a reason. Replace it with a quieter one if you must, but don't compromise the airflow. As to RFI. All SMPS's create it, some more than others, by design. It can be filtered of course, but to do that properly will also cost a fair bit. Voltage divider? Just use a dedicated 12 (13.8V) PSU for the K3. You then have redundancy for when the 48V supply quits at some point. If you must, one of the common "Telecom" DC/DC converters, (48 to 15V, and a linear post reg) to get your K3 supply. But, make sure you know which side of any such DC/DC converter is common, if not isolated. You may be (unpleasantly) surprised! Remember the KISS principle. 73 Dave G0WBX. On 09/12/17 19:47, [email protected] wrote: > I need to buy a 48 VDC power supply for a project that requires that voltage > ? and possibly along with a voltage divider to power the K3. One suggestion > I?ve received is the MeanWell SE 600-48. The online reviews are good, noting > only high fan noise, which can be fixed by replacing the fan with a Vantac > Stealth. But I haven?t seen anything about RFI. > > Anyone know this PS who could say something about the RFI question? Anyone > have other suggestions for 48 VDC and at least 12 amps? > > Thanks, as always, > > Ted, KN1CBR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
