I have encountered a problem here after having things apart briefly.
The PSU (Connex SMPS 600) will turn on (led light shining, and output voltage is good) when I don't have the amplifier connected.
But if I connect the amplifier board it will just switch what I believe is a relay every second or so.
I tried another PSU on the amplifier board and it started without problems, so I would say it's safe to say that something has gone wrong with the PSU while being out for a while.
The only thing that I can see with my eyes are one of the outputs tabs is moving a little (it's been that way since I got it), could it be bad soldering on the output that stops it from starting up? Not enough current passing through or an instability sensed by the PSU?
My soldering abilities are not the best, so I want to rule out things before I go and make it worse. 😄
Any help is greatly appreciated.
The PSU (Connex SMPS 600) will turn on (led light shining, and output voltage is good) when I don't have the amplifier connected.
But if I connect the amplifier board it will just switch what I believe is a relay every second or so.
I tried another PSU on the amplifier board and it started without problems, so I would say it's safe to say that something has gone wrong with the PSU while being out for a while.
The only thing that I can see with my eyes are one of the outputs tabs is moving a little (it's been that way since I got it), could it be bad soldering on the output that stops it from starting up? Not enough current passing through or an instability sensed by the PSU?
My soldering abilities are not the best, so I want to rule out things before I go and make it worse. 😄
Any help is greatly appreciated.
Do you have lots of reservoir capacitance on the amplifier board, which appears directly across the SMPS supply?
That is often enough to cause this issue, becasue many SMPS will go into over-current limiting on start-up into such a load, and refuse to ramp-up voltage output.
You may have to experiment a bit.
That is often enough to cause this issue, becasue many SMPS will go into over-current limiting on start-up into such a load, and refuse to ramp-up voltage output.
You may have to experiment a bit.
But this has worked before, it has just been apart for a while as I needed to make a new case.
The other PSU is half the size (in spec, 300W/28V vs 600W/48V). Amp board is a regular 3255. https://www.audiophonics.fr/en/ampl...d-balanced-tpa3255-2x-225w-4-ohm-p-14690.html
The other PSU is half the size (in spec, 300W/28V vs 600W/48V). Amp board is a regular 3255. https://www.audiophonics.fr/en/ampl...d-balanced-tpa3255-2x-225w-4-ohm-p-14690.html
I figured I should update my results here.
I took a deep breath and re-soldered the two tabs, it was on closer inspection both one AC input as well as one DC output that was wiggling a little. It now powers up like it should so I'm guessing/hoping this was the problem.
I just hope this didn't cause any of the other problems that I've had, I don't even want to go there. 🙈
I took a deep breath and re-soldered the two tabs, it was on closer inspection both one AC input as well as one DC output that was wiggling a little. It now powers up like it should so I'm guessing/hoping this was the problem.
I just hope this didn't cause any of the other problems that I've had, I don't even want to go there. 🙈
