Aero ‘lectrics

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Jim Weir continues his series on digital logic (CMOS), and makes the little logic circuits do things that their inventors never considered.

Aero ‘lectrics

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So far in Jim Weirs investigation of digital logic, hes explored small scale integration. This time, its time to ramp it up a bit and use some medium scale integration devices that will remember your settings.

Aero ‘lectrics

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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.

Aero ‘lectrics

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If you need a horn to sound when the airspeed drops below a certain level or when the power is cut and the landing gear is still up and locked, an electronic circuitry solution is the lightest, most reliable and most cost-effective way to go.

Aero ‘lectrics

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This month, we look at how an airspeed indicator works and rig up a simple calibration tool for it;

Aero ‘lectrics

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This month we get into actually building the portable antenna that was described last month;

Aero ‘lectrics

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In this first of a two-part series, Jim Weir builds a low-cost, high-efficiency portable ground-based antenna system that he used to great effect in the recent CAFE 400 (fuel efficiency) race in Northern California. You can do it, too.

The Home Machinist

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If your hacksaw has been relegated to the bottom of your toolbox, chances are its because you don't know how to use it properly. Author Bob Fritz offers a primer on the subject that may make you think more highly of this underused tool. A discussion of cam construction and keyless chucks rounds out this installment.

Aero ‘lectrics

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Impressed by the quality of the cheap headsets he encountered on a recent commercial airliner flight, Jim Weir dissected the airline unit and has come up with a way to replicate it in your own shop.

Aero ‘lectrics

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Columnist Jim Weir comes up with what he thinks is the optimal design for getting power from the 12-volt aircraft battery to the LED without wasting any.

In Case You Missed it

Wind Tunnel

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Design process, part 3-how fast?

Completions

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Builders share their successes.

Magnetos For Half VW Engines

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Points to ponder at replacement time.

Checkpoints

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Oshkosh 2017 musings.