A new TRAMAG oscillator
A. Meyerhoff, Robert Tillman · 1957
This paper is concerned with a class of oscillators having otùy two intrinsic windings on the core. lt is capable of true square-wave output at 700 kc.; the upper frequency limit being determined by the present state of the art of transistor development. On the basic two-winding oscillator described, the collector winding of the OFF transistor itself supplies the necessary regenerative voltage to the base of the ON transistor. The parallel RC's in the base circuits speed up the turn off action by application of inverse current to the ON base. Direct electrical crossconnection from the ON base to the OFF collector means that at switchover the in ver se transient voltage, due to flyback, will momentarily place the OFF transistor into inverse saturated conduction, thereby presupplying it with holes so that it can take on its load in the forward direction extremely rapidly when the ON transistor shuts off. With this circuit, selfstarting is inherent due to the direct connections from base to negative supply. The transistors used are SB-lOO's (low saturation resistance), and the switching flux of the core is 0.04 microwebers.