Electromagnetic position transducer having active transmitting stylus

摘要: Disclosed is electromagnetic transducer that does not require complex analog to digital, digital converters, microprocessors or large memory circuitry. The has a helical tablet coil with tap nodes spaced between its end extremities. In one configuration, an oscillator drives the for simultaneously producing oppositely directed currents on opposite sides of selected taps, creating moving fringing field compatible modern graphic display technology. A control circuit closed-loop integrator detecting centroid received stylus signal from coil. Analog and versions are disclosed. another variably coupling magnetic flux coil, receiver coupled extremities being responsive position taps selected. preferred configuration separate wound components.