I recently put together a Frequency Center Routemaster PSU and have been having issues - though I am starting to believe the problems may have started earlier.
Previously I had two FC Power PSU’s in my case and everything seemed fine. Now that I have begun using both PSU’s (one was enough for the longest time) strange behavior began when sharing them. Nothing catastrophic (so far as I can tell) but more just ‘annoying’ behavior such as drifting and noise.
I have pulled all of them out at this point and have them currently sitting on my bench. Is there a way I can safely put them to the test and make sure they will play nicely with each other?
I’ve been using my mini-duck and the k25 LFO as the ‘sacrificial’ test modules. If I have them both plugged into the same power supply (any of them) everything is fine and when I tap the tip of the LFO jack to the sleeve of the mini-duck trigger it fluctuates a little but works exactly as expected when fully plugged in.
If I have them plugged into any two different PSU’s, the LFO speed goes to something like audio rate when I tap the tip against the sleeve of the mini duck trigger - which makes me not want to plug it all the way in.
I have heard warnings in the past of making sure that things are not “out of phase”. Knowing how to test for this and avoid it would be helpful.
I am 99% sure this is the exact same one - but I’ll admit, I threw away the plastic enclosure after I took it out to mount in my case. You know, like a smart person.
I had an idea today. If I swap the transformer with a center-tapped one, the currents the two AC wires will induce in the ground loop should cancel each other. I will experiment with this, possibly running them as a twisted pair.
I have stripped everything out of my case so I can have a bit more room to redo my wiring. Everything seems to work fine individually when I do tests on my desk.
If anyone is familiar with this type of oscilloscope -
