With all the excitement I missed something. Can you explain this for me? > 4) Add the compensation cap. Just remove the 723 chip from it's socket > and solder it across the back of the board, then reinstall the chip.
What is the compensation cap? BTW: I've never been able to find a good clear copy of the astron schematic. They are always "fuzzy" whae you blow them up where you can print it off. William Brown KG4AQH -------------------------------------------------- From: "Mike Morris" <[email protected]> Sent: Monday, June 21, 2010 2:19 AM To: <[email protected]> Subject: Re: [Repeater-Builder] Astron RS50 Power Supply > At 08:57 PM 06/20/10, you wrote: >>Thanks to all who replyed to my question on the Astron. >>Mike, I did not check the box on the 404 Error, but Chuck sent me a >>copy of the schematic and when I returned to the site they all opened. >>Thanks for the heads up on the Astron Page, I am re-reading as I >>don't think I have the Cap. you mentioned.I also have to check to >>see if Negative Stud is insulated from the case. >>I replaced the 1000 Uf Electrolytic and it took off. Any of the >>suggestions, i.e. Loose Screw on the filter Cap. or a Bad filter Cap >>after 20 years could have been the problem. >>Again thank you all for the information. Now to fine tune it before >>I cover it up again. >> >>73 JIM KA2AJH Wellsville, NY > > You're welcome. > > I suggest you go down the mod list on the introductory page. > > At a minimum I'd: > > 1) put split (lock) washers on the pass transistors and on the filter > caps. > > 2) Verify that the power cord green wire is grounded to the case. Put > a star washer between the lug and the case and tighten it snugly so > the edges of the points of the stars bite into the case and into the lug. > This is a safety issue and your survivors will thank you. > > 3) Make sure the power cord and the fuse holder is wired so that the > hot (black) wire in the cord goes to the power switch and then to the > center pin of the fuse holder. The barrel (the outer sleeve) of the of > the fuse holder (nearest the case) goes to the transformer. > This is another safety issue. > I am not the only person who has been zapped because the AC hot > wire had been wired to the sleeve of the fuse holder. The issue is that > when you pull a good fuse out of the holder the tip of the fuse will > touch the sleeve contact in the holder and if your other hand is on > the case of the equipment... ZAP ! > > 4) Add the compensation cap. Just remove the 723 chip from it's socket > and solder it across the back of the board, then reinstall the chip. > > 5) Float the negative side of the supply off the case. > > None of these five changes cost significant time or money. > > Mike WA6ILQ > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > >
