| Selin design looks to be digital since the description says it updates the MAF output over 1000 times a second. It’s an obvious approach as you sample the two MAFs with an ADC, compute combined output, and then command a DAC to generate the new signal. Going full analog allows for a continuous output instead of the stair step output a digital solution would. I’m using a 16-bit DAC on a 5.12V scale so the resolution is about 78uV. Which really isn’t a big issue. A low pass filter will clean it up, but does add a small amount of signal delay. An analog design will also not be subject to noise glitches. I know the Selin implements a watchdog timer so if it ever locks up it will restart itself. So fault correction must be managed. I also mentioned the analog design is cheaper to build = Lower sale price. What I’m finding right now is that the cost of IP65/67 rated connectors and switches is pricey and stock is a bit sparse. I found the switch used in the Selin unit and it’s not in stock anywhere. I did find an alternative, but the other would have been preferred.
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