Oscillator Circuit Thirteen can be used to build  a Linear Travel Position
Sensor
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S. S. Patent 3,474,332                  www.luetzow.us                     File:3474332.jpg
Oscillator Circuit Thirteen is a push-pull oscillator. If the two 50 uH inductors
are changed by +/- 25 uH so one will be 25 uH while the other is 75 uH, a +/-
One Volt differential will be developed at the meter terminals.