Search for Buried Treasure With This DIY Magnetometer
Cars That Think
APRIL 26, 2022
But feeding it to a second op amp configured as a simple comparator (one that compares the input with zero volts) squared the signal up nicely, with the output switching between the +12-volt and –12-volt supply rails every 3 milliseconds or so. This article appears in the May 2022 print issue as “A DIY Magnetometer.”.
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