[RFI] Suggestions for linear 19 volt supply?

[Michael Coslo]

There are switching Power supplies, and there are Switching power supplies. A bad one is not the same as a good one. I have a nice linear Astron, and a Alinco Switcher I use interchangeably, and no practical difference other than size and weight. Caveat, if you are doing really low frequency stuff, don’t use either linear or switcher. Use an actual battery, no 120 hz ripple and no switching artifacts to disturb the atmospheric noise.

Unless you’ve measured and found the switcher you are wanting to replace, and found it noisy, it isn’t worth the effort to work up a 19 VDC supply IMO

-73 de Mike N3LI -



> On Mar 19, 2018, at 9:34 PM, W7SLS <w7sls.scott at gmail.com> wrote:
> 
> Hello,
> 
> I’ve followed the recent threads, including the “replace switching supplies & wall warts with linear ones”.
> 
> Agree, that’s (relatively) easy to do with 12 volt devices (linear supply, battery, etc.).
> 
> What would you recommend for 19 volt items (laptops, intel NUC, monitors, other devices), and distribution system for same?
> 
> 	* Prefer battery backup (“float a 19 volt battery” or w/e)
> 	* Prefer to avoid fan noise (e.g., HP 6023A 20V/30A/200W is nice, but too noisy)
> 	* Avoid the standard 12 volt power pole convention
> 	* Some (many?) laptop supplies sense the battery capacity to adjust charge characteristics (3rd pin)
> 	* Probably other concerns to think about :)
> 
> A google search shows several that apparently confuse “in - line” (that is, not inside the computer) with “linear” (as in, non-switcher).
> 
> My guess is that there are several (?) switchers inside the laptop, monitor, NUC, so perhaps it is a low (or non-existent) ROI project?
> 
> Thanks,
> Scott
> W7SLS
> 
> 
> 
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi