June 1968 American Aircraft ModelerTable of Contents
Some things never grow old. These pages from vintage modeling magazines like American Aircraft Modeler, American Modeler, Air Trails, Flying Aces, Flying Models, Model Airplane News, & Young Men captured the era. I will be glad to scan articles for you. All copyrights 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 June 1968 American Aircraft Modeler magazine. It was part of a monthly column by Howard Mc Entee called Radio Control World.
Simple Reed Servo Driver
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.