I have 2 Astrons and they are great supplies. On both replaced the caps and all was very quiet Ken WB8PKK
Sent from Yahoo Mail on Android On Mon, Feb 25, 2019 at 8:04 PM, [email protected]<[email protected]> wrote: Filter caps bad? AC on the DC supply side maybe? A well made linear supply does not make noise that has to be filtered otherwise. All switching supplies must be cleaned up because their design generates noise. -----Original Message----- From: [email protected] <[email protected]> On Behalf Of K9MA Sent: Monday, February 25, 2019 8:13 PM To: [email protected] Subject: Re: [Elecraft] OT: Astron linear PS regulation issues That's interesting. About the only way I know that a linear supply can be noisy is if the regulator oscillates. That can easily happen. Most of them use emitter followers, which are often unstable driving a capacitive load. That's usually easy to fix by inserting a small inductance between the emitter of the transistor and the load. A few turns of the appropriate sized wire around a ferrite bead usually works. 73, Scott K9MA On 2/25/2019 18:57, William Rascher wrote: > On Monday, February 25, 2019 4:26:40 PM CST Rose wrote: >> I've found instances of regulation failures caused by loose hardware. > With the RS-35m Astron Linear PS I have issues with noise. I > purchased the PS because everyone around me swears that they are > great. Well, from my experience the Powerwerx SS-30DV is far cleaner, > quieter, and fewer $$. I though the problem was something along the line of LED lighting, in my > shack was generating the noise. When I used a battery for the PX3 & KX3 > in my shack during a power outage the PX3 screen was so clear I was > stunned. I have 3 different Astron linear PS and all are noisy. -- Scott K9MA [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 ______________________________________________________________ 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
