REFERENCES
- H.C. Morgan, 555 timer provides PWM drive for low-cost dc motor control, EDN, Vol. 29, No. 7, pp. 193–196, 1981.
- T.S. Rathore & K.R. Pai, Linearly-controlled Duty-cycle Circuits, Journal of the Institution of Electronics and Telecommunication Engineers, 29, 3; 1983; 133.