DC motors and outboard power supplies...

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.

Hi Lewm,

I just got home from listening to a 17 piece jazz band playing charts from Count Basie, Duke Ellington, and the like. Great fun! I'm going to spin a few albums now and try and take some measurements as you suggested and see what happens.

I appreciate your words of caution as well.

No Regrets