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AMA 92498

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Simple Reed Servo Driver, by Bobby Hill
July 1968 American Aircraft Modeler

July 1968 American Aircraft Modeler

Airplanes and Rockets - July 1968 American Aircraft Modeler     [Table of Contents]
Aircraft modeling has undergone significant changes over the decades - both in technology and preferences. Magazines like American Aircraft Modeler, and American Modeler before that, were the best venues for capturing snapshots of the status quo of the day. Still, many things never change, so much of the old content is relevant to today's modeler.

Whether you are here to wax nostalgic, or are just interested in learning history, hopefully you will find what you are seeking. As time permits, I will be glad to scan articles for you. All copyrights (if any) are hereby acknowledged.
At the request of a website visitor Bobby Hill, I hunted down and scanned this Simple Reed Servo Drive circuit of his that was published on page 31 of the July 1968 American Aircraft Modeler magazine. It was part of a monthly column by Howard Mc Entee called Radio Control World.


Simple reed servo driver: As was the case with his trim servo amplifier for converting reed servos, which we diagrammed in a past issue, the self-neutralizing amplifier shown here will fit inside a Crescent 15-pin plug, so doesn't even have to go inside the servo. Arrangement has been used by Bobby Hill (2125 18th St. S. E., Washington, D. C. 20020) with Duramite servos. Circuitry should be such that negative voltage is applied to the bases of the 2N1303 transistors, when a reed vibrates. The four positioning contact strips are all connected together as a safety factor, and to lower resistance.

Airplanes and Rockets - Simple Reed Servo Driver


Bobby Hill, a dedicated reed flyer, developed this remarkably simple reed servo drive amplifier that requires no bias battery. We needed this idea ten years ago! Other applications possible.