The On-Mode Transistor Multivibrator

A mode of operation of astable and monostable multivibrators which has received little attention is discussed. The timing of the quasi-stable states in this mode is determined by an RC network as for the conventional two-transistor astable or monostable multivibrator. However, the timing is determined by the network associated with the "on" transistor, rather than the "off" transistor. The analysis of the basic symmetrical on-mode circuit considers design requirements and period stability. Comparison is made with the conventional off-mode multivibrator.