DC motors and outboard power supplies...

Dear No regrets: Ok, check what Lew suggest.

+++++ " My supply does have variable pots to fine tune the speeds for 33 and 45. I can get the table to spin correctly, but then for no reason at all it justs slows way down. " +++++

I don't know which kind of pots your TT has but from what are my experiences about and taking in ount what you posted: +++ but then for no reason at all it justs slows way down... ++++, maybe there is something wrong there because that kind a problem is a sign that a pot could be going out of specs and with the working time in the future that problem could be worst.

Btw, have you the trouble in both speeds?, if yes then I think that maybe is not a pot because it is almost imposible that both suffer a damage at the same time.

Now, for any one could to have a precise diagnosis it is desirable that the check-up on your TT have to do it when the failure is present.

I can't say nothing more except: good luck.

Regards and enjoy the music.
Raul.

Hi Raul,

Thank you so much for your suggestion about the variable pots. To be honest, I never thought about them going out of spec. That's a great idea. I'm not sure if I have the problem in 45 speed as I don't often listen to 45's as I do the 33's. My next listening session I will dedicate to 45 issues and will see if the problem presents itself. Thank you Raul and to all for trying to help me with this. It means a lot to me.

No Regrets

No_regrets, how do you get the controller to work properly again after one of these slow down episodes?

Hi Dan ed,

"No_regrets, how do you get the controller to work properly again after one of these slow down episodes?"

I shut the supply down, pour myself a drink to calm my frustrations, and after a period of time, sometimes a couple of hours later or the next day I go back turn and turn it on. Many times it works just fine, but sometimes not. That's the thing about it. I don't do anything to it.

One of my thoughts was that something may be drawing too much current and causing one of the many regulator chips to go into thermal overload. But then why is it that I can literally listen for up to 8 strait hours without a problem one day and the next day not even make it 1 hour?

Raul brought up the trimmer pots may be going out of spec. I don't know a lot about electronics but that could be an option. I can't seem to find the exact model number anymore, but I would think as long as I replace with like values it should be fine. I found some for as little as 79 cents. Worth a try at least.

Thanks for your question. I'm sorry I don't have a more technical answer for you though.

No regrets, This is just my 2 cents, but if you don't know how the motor control circuit works, I would advise against random parts replacement. That can lead to confusing the issue, if you make an error. Anyway, I am sticking with the idea that you should measure some voltages during full function vs during problematic moments. It sounds like the problem IS localized to the motor or its upstream circuit.