So basically, I turn on light1 (by supplying power to driver1), I instruct CH0 of the DAC to go to 100%, light1 is now fully on. All good. Next, I turn on light2 (by supplying power to driver2) and suddenly all channels of the DAC go to 0V, meaning that light1 which was at 100% first, is now at it's minimum. To make it more 'pleasant', this only happens 'sometimes' (like in 2 out of 10). After replacing almost everything and trying every possible scenario my conclusion is that the driver must be sending some kind of signal when it's started that (sometimes) disrupts the DAC. From the moment I disconnect the 0-10v connection to the DAC from the driver I'm toggling (and leave everything else in place) the problem dissapears.
To test my theory I was thinking on trying a signal repeater that has galvanic separation. It would then 'copy' the 0-10v signal from the DAC to the driver. However, the best I can come up with is a Wago 857-412. This is a rather expensive solution to a) test a theory b) even if it works I need one for each channel.
So, my question is, is there a cheaper solution for such a separator? I understand that this particular question is not really RPI related, however, I was also hoping that there could be other (maybe more RPI related) solutions that I could try, so ideas are more than welcome.
Thanks for reading.