@kenshirriff Fascinating ! 2 questions, if I may: 1) is that some type of input protection? 2) the datasheet states HDB3 outputs can source 10mA, whereas all other output currents are 1.6mA. So I went looking for larger drivers, but all outputs look similar. Am I missing something (maybe it's just that the design got revised?). Thanks for all those nerdily interesting posts 🙂