Re: Replacing electrolytic caps in a DC power supply - selecting the right ripple cur

thanks for the clarification mariushm. I have always been a big fan of Panasonic, so I will certainly take your advice on those in my next search. I do know that the audio version is not critical in this applciation as the caps are not in the audio stream, but if they are "audio" grade, they are probably better than "general" anyway.

stj, I would be happy to have a deja vu all over again on hashtags here if you like. The market is sure hammering the hashtags out...

Re: Replacing electrolytic caps in a DC power supply - selecting the right ripple cur

thanks stj for that 3 uF correction. Love your facebook notion.

Also thanks to budm for posting the direct link to the schematics. My 85 year-old uncle almost lost his bowels when he saw that schematic. He could not believe that a "record player" had so much complexity in it. He is very old school. I had to tell him it is not a crank-up Victrola, but a true transcription turntable. But then he prefers to work on lawn mowers.......

Re: Replacing electrolytic caps in a DC power supply - selecting the right ripple cur

mariushm, cheap is not in my vocabulary when it comes to my music. Costly is the only thing that comes to mind. But I do not want to pay a fortune for repairs that I may be able to do myself. I have a lot of experience changing out parts from various lab instruments, but these are canibal activities that are obvious repairs.

I don't mind spending the dough, but all of the caps I have looked at so far are less the $1 each. I would gladly spend 10x this amount per cap to fix it, but...

Re: Replacing electrolytic caps in a DC power supply - selecting the right ripple cur

STJ, your response is in line with paulstef. This is really limiting my options - goody. Sorry for my lack of electronics. I am a Biochemist and like most of you guys, cannot "see" what I am doing most of the time. With electrons, it is orders of magnitude below the molecular level, and fast! At least you can see the circuit. Have attached a link to schematic. Hope it comes through.

[URL="http://www.hifi-manuals.com/Thorens/TD-126-Mk3/downloads"]http://www.hi...

Re: Replacing electrolytic caps in a DC power supply - selecting the right ripple cur

Paulstef, I did not choose lowest ripple current (RC), Digikey reps did - they had a pow-wow regarding the details on DC PS I have provided above, and got it wrong I think. Before ordering, I wasn't sure and read up some more about overheating caps with wrong RC, and slow recharging rates if RC was too high, etc. Got confused and don't want to wreck the PCB and/or endlessly replacing caps. I believe the noise is caused by a failed electrolytic cap that is not sufficiently filtering the 4-diode...

Re: Replacing electrolytic caps in a DC power supply - selecting the right ripple cur

Sorry budm, no idea. The available schematic is very minimal on that aspect, showing almost exclusively the DC portion.

My turntable has developed ripple-like noise that is probably related to the DC power supply, or the motor control section, and likely caused by failure of one or more of the 30 year old electrolytic caps. (Found a post elsewhere that someone repaired their same model with Nichicon caps but no specifics.) I have sourced some caps at Digikey and was told to go with the caps with the lowest ripple current since this powers a high torque DC motor, but now I find this may not be right having read about heating problems etc. All I have are the uF, voltage and size of the caps that need replacing. They...

Re: New Members - please post your introductions here

Greetings Fellow Earthlings,

I am a Biochemist so cannot see what I am doing. You electronics freaks have an easier time in some regards, but there is sooooo much to know. And of course you can never be sure where all those electrons are really going, let alone what they are doing! Hoping for a little help from some pros who work with those pesky electrons......Let me know if you need any help with Biochemistry.

tomcat 101