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Used a couple of TTL logic chips and total cost was around $8. It worked great, but unless you want a bread board hanging zip tied to your MAF you are looking at close to 100$ to get a one off PCB printed, then some type of enclosure (was planning to use the 3d printer at school), a few more bucks for MAF connectors and suddenly your not saving anything vs buying a Selin unit. plus my design was 100% susceptible to RF interferance which Jim already worked out in his unit, and I'm sure his design is probably way better than mine in the first place, given the fact that hes some kind of electronics engineer and I took a class once =) that said, I could post my circuit diagram if your interested.
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