This paper develops a new model-based control aimed to stabilize the propagation velocity of electrical pulses circulating in an one-dimensional ring model of the cardiac tissue. The controller induces small currents using electrodes placed along the ring. This current responds to the discrepancy between the pulse front voltage, measured at an electrode, and a voltage of a set pulse front at the same space point. The proposed control is, in fact, a distributed continuous-time feedback control that stabilizes the spatiotemporal evolution by using a finite number of electrodes implanted on the heart. We present a systematic methodology to predict conditions for pulse instability using linear analysis of the lumped truncated mathematical model of the cardiac tissue. The control effectiveness is measured by the critical length (L*) below which the pulse becomes oscillatory in a moving coordinate. This domain enlarges from L* = 10.1cm in the open-loop system to 9.0cm and 8.0cm in the closed-loop system with 2 and 8 electrodes. The validity of control is justified by using the map that connects sensor positions at neighboring time steps.