The Astron supplies usually have a crowbar on the output which shorts the output if the voltage rises above 15 Volts.
Sent from my iPad On Sep 18, 2012, at 5:51 PM, "Vic, K2VCO" <k2vco....@gmail.com> wrote: > I've fixed two Astrons for friends. One had a burned-out IC and the > other had a damaged board where the capacitor mounting screws had > loosened and generated heat. Both failed without producing overvoltage. > > I have one that I've been using for perhaps 15 years with no problems. > > On 9/18/12 2:14 PM, Ron D'Eau Claire wrote: >> I guess it depends upon which Astron model you are working with. I've worked >> with a great many RS and RM Astron supplies in Ham and Commercial systems >> over the years and have never encountered one that made more than a very, >> very quiet hum. >> >> I'm not sure what you mean about the regulator not being "quiet". The LM723 >> is a simple linear I.C.; no switching noise and no acoustical noise. >> >> The popular RS and RM series have both automatic over-voltage and >> over-current shut-down that protects both the power supply and any equipment >> connected to it. >> >> In decades of use working with a great number of Astron supplies - many of >> which are in 24/7 service operating commercial equipment - I've yet to see a >> regulator failure - or any Astron failure for that matter. I'm not >> suggesting that they won't fail, but I've yet to see it happen in, >> conservatively, tens of thousands of operating hours. >> >> My station Astron resides on a shelf out of the way under the operating >> table so having a matching appearance with the rest of the K-line is not an >> issue for me. >> >> 73, Ron AC7AC >> >> >> >> -----Original Message----- >> >> >> Being linear regulators, the Astron supplies are probably pretty RF quiet, >> but for what they cost they are big and can be acoustically noisy (I have >> heard several buzzing transformers), not to mention containing antiquated >> circuitry. LM723 regulators are not the quietest nor most stable linear reg >> ICs available these days, and have limited regulation bandwidth in stable >> implementations. Considering these factors i have been reticent to buy one. >> >> I bet Elecraft can outdo what is available in a pretty little matching >> package. >> >> Howie - WA4PSC > > > -- > Vic, K2VCO > Fresno CA > http://www.qsl.net/k2vco/ > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
