I’m having an issue with a sampler module. The module fails to turn on about 50% of the time. I suspect it has to do with power protection when turning on the case. Perhaps because it takes a little time for the caps in the FC Microbus to fill up. When I unplug the module and plug it back in, it works like a charm. I have contacted the manufacturer to see what they advise.
In the meantime, I’m debating building a little power bus to add to the bottom of the Eurorack playset panel that allows me to turn a specific module off and on again.
I’m not super familiar with how to do this. My best guess is to add a DPST switch to a DIY bus board that interrupts the +12V and the -12V. Is that adequate? Do I need a different switch than that?
I wonder if putting a large value electrolytic across the power rails might be enough to slow startup of the module in question so it doesn’t need to be removed and reinserted. Another idea is to use a relay operated by an Arduino, instead of the manual switch. The Arduino would just sit around to give the PSU time to stabilise, then it would turn on your module.
That would be a bit of a waste. Use an entire MCU to do something one capacitor, one resistor, one transistor and relais/MOS FET could do (or use a timer IC like a NE555).
A slow rising power supply might actually be the problem since plugging it in an already on power supply works fine. So adding a large capacitor would likely make the problem worse.
That’s sort of what I am guessing. If I unplug the power supply and plug it in again, the module won’t start. Likely because it goes into a protection mode or something when the power is too low and won’t leave that mode until all power is cut off. I think a delay could work.
