This article presents a novel type of time-modulated magnetless circulators, where modulation is generated locally at each modulated element through a network of local oscillators instead of a central source and a complex distribution network based on phase shifters and filters. The design follows the angular-momentum approach, and the modulation signals are generated from three cross-coupled oscillators interconnected through transmission lines in a ring topology to phase lock and attain the necessary phase difference of 120°. The oscillators are interwound with the circulator circuit by designing them to operate in a differential mode, in contrast to the common mode of the circulator circuit, allowing natural isolation between the RF and modulation paths. Two prototypes were built to test the design. An initial preliminary printed-circuit-board prototype was fabricated to test the common-differential mode topology with modulation signals generated off the board. The design was tested at 1.78 GHz, showing isolation of more than 20 dB, insertion loss of 5.5 dB, 2.6% bandwidth, and power handling of 21 dBm. A final prototype was fabricated to test a fully autonomous circulator, with the modulation signals generated locally at each modulated tank. The final design was tested at 1.65 GHz, showing isolation greater than 20 dB, insertion loss of 5.3 dB, 4.8% bandwidth, and power handling of 25.52 dBm. The results open a path for a new class of autonomous time-modulated devices without the need for complicated modulation networks and with an ability to incorporate a large number of modulated elements.