To all on the net: I bought an AS35A at a swap meet and so far it's doing it's thing just fine with the K3. But there was no paper work. Are there tests I can do that say yeh verily this thing works as designed? 73 N7RT
----- Original Message ----- From: "Tom Hammond" <[email protected]> To: "Dan & Jean" <[email protected]>; <[email protected]> Sent: Sunday, February 28, 2010 7:35 PM Subject: Re: [Elecraft] [K3] Overvoltage protection? > Dan: > > If the Astron is working AS INTENDED, when the OVP SCR fires, the UA723 > VReg > will immediately go into over-current protect mode, reducing the output > current > to <1A WITHOUT damaging ANYTHING! Same as if you placed a short directly > across the output terminals of the supply. > > The ONLY time the fuse should blow is if the p ass transistors shorted. > > 73, > > Tom Hammond N0SS > > At 20:28 02/28/2010, you wrote: >>I recently purchased a 35 amp Astron power supply at a hamfest (in >>great condition). Upon inspection, I found that the crowbar SCR had >>failed, and had been removed. >> >>Although I've replaced the SCR, I'm wondering if the K3 has >>overvoltage protection of some kind? >> >>As an aside, I would like to test the crowbar circuit in the Astron, >>but with that big capacitor in there, I'm kind of hesitant. That >>big capacitor would have to discharge before the primary fuse would >>blow (maybe blowing the SCR)--right? I'm thinking of putting a 25 >>amp fuse in series with the capacitor. Anyone address this before? >> >>Thanks, >>Dan - W4TQ >>______________________________________________________________ >>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 > > ______________________________________________________________ > 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 ______________________________________________________________ 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
