MIDI has 5 mA loop idle current. It's flowing continuously while no data is transmitted. Parallel multiple potentiometers could keep the rating. If you don't manage to change their code simultaneously, you might still exceed maximum current. There should be better solution.
Thanks for that. A better way, sure. But not at this stage. The hardware is set. Other than drilling holes and inserting an additional switch, this is the only way. If the product is produced again, we might look at doing it another way. But still, if this way works, I don't see why it can't be kept this way.
Commands to all wipers are sent over SPI directly after one another, all within the same 10mS interrupt, so their is no opportunity for the wipers to get out of sync. There are four pots, so that will spread the 5mA over them. And, if two do get out of sync somehow then the 5mA will still be spread over the other two.
So, aside from it being unusual, is there a problem with it?
thanks for your assistance.
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Hi,
I still don't know the aim of it all .... and how the circuit should look like.
Klaus
That's OK Klaus, thanks for considering. However, I just needed to know whether I could pass 5mA over the digital pots in parallel, and it looks like I can. I'll set up a circuit and do some measuring.