Though current-feedback magnetic multivibrators are highly efficient and reliable, the oscillation frequency normally varies according to the load. This paper proposes a new, negative-feedback-controlled, current-feedback magnetic multivibrator. The resulting circuit has almost constant oscillation frequency, provided by a control circuit including a frequency-voltage (F-V) converter. New magnetic multivibrator using the frequency compensation circuit thoroughly cancels the dependence of junction voltages on the load. Variation in saturated flux of the saturable core also has no effect on the oscillation frequency. Oscillation frequency was best compensated at a fixed value when a phase-locked loop (PLL) was employed as F-V converter.

http://ieeexplore.ieee.org/iel5/8870/28025/01252137.pdf

Current-feedback magnetic multivibrator with feedback-controlled frequency compensation circuit using phase-locked loop

An improved current-feedback magnetic multivibrator having a constant frequency of oscillation is proposed. Current-feedback magnetic multivibrators are noise-proof, reliable, and highly efficient. However, the frequency of oscillation varies with the load. The proposed multivibrator can compensate the oscillation frequency by feedback control. This circuit succeeds to advantages of self-excited multivibrators.

W. Tahara

Papers

Current-feedback magnetic multivibrator with feedback-controlled frequency compensation circuit