On 11/20/2017 5:50 PM, Brian Hunt wrote:
Be careful using the non-regulated linear wall warts. The open circuit voltage can be more than 16 VDC and could be harmful to gear not rated that high.
Yes and no. The vast majority of linear wall warts are UN-regulated, but the current drawn by the equipment being powered significantly reduces the output voltage, usually to the rated value. That's how linear, unregulated power supplies work. That's why it's good to match both rated voltage and current. AND -- most equipment will tolerate moderate over-voltage. The K3, for example, is rated for 15VDC max.
And, or course, not all gear runs on 12VDC -- lots of stuff runs on 5V, 7.5V, 9V, and 14V.
Best to measure OC first!
Measuring OC is a good thing, and EXPECT to see 25-30% higher voltage than rated. But what matters is the voltage under load. And that's why my applications note recommends putting Power Poles on both the wart and the connector to the equipment, then sticking a voltage monitor in line with the equipment connected. You did read the link I posted, didn't you? :)
73, Jim K9YC ______________________________________________________________ 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]
