Jim, Good tip. I want to try that with some of my old walwarts N2tK, Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jim Brown Sent: Monday, November 20, 2017 4:42 PM To: [email protected] Subject: Re: [Elecraft] Walwarts - linear supplies
Older wall warts are linear. If you're smart enough to have saved them, there's a good chance you won't have buy anything. Simply select one with the matching voltage and rated for the needed current, cut the cables to both old and new warts, splice the old wart to the connector that mates with the unit you need to power. Older warts are often available at second hand stores and flea markets. $1 is the going rate. In general, linear warts are much heavier than SMPS units, so that's a good first check. A better one is to plug it into AC and hold a portable radio next to it tuned somewhere near 2 MHz (like the top of the AM BC band). If you hear hash, it's a switcher. If you don't., 99% chance that it's linear. All of this is described in http://k9yc.com/KillingReceiveNoise.pdf 73, Jim K9YC On 11/20/2017 1:17 PM, Joe Subich, W4TV wrote: > All Electroncs (www.allelectronics.com) has analog wall warts of > various voltage/current capability depending on what is available in > surplus at any given time. One may not even need regulated voltage as > many devices contain internal regulators ... ______________________________________________________________ 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] ______________________________________________________________ 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]
