450_500_kHz_WOBBULATOR

Published:2009/7/2 0:54:00 Author:May | From:SeekIC

Center frequency of sweep is adjusted with C1 and C2. With appropriate coil, operation can be extended up to 10.7 MHz. Transistors can be BC107, BF115, BF194, or other equivalent. Choose value of Rx to give best waveform with transistor types used. Feedback for VCO is taken via Tr3 without phase change. If control voltage for base of Tr3 is derived from ramp out-put of oscilloscope time base, wobbulator out-put will follow variations in sweep voltage of time base.-E. C. Lay, Wobbulator, Wireless World, May 1975, p 226.



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