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This month, author Jim Weir lays the groundwork for a solar battery charger, complete with preliminary circuit board considerations drawn from a rats nest and details about how to order a pre-fabricated board.

The subject this month is Schmitt triggers and digital gates, which can be employed for a variety of purposes in homebuilt aircraft including use with switches and sensors or panel lighting.

Bringing you safely to final stop…and off again.

As the fleet ages, many owners and builders forget to check the date codes...