Second circuit I'm going to guess that the reverse breakdown voltage of the transistor basis-emitter is less than what can occur in this circuit, with that output circuit keeping the mid-point a short time at +12 at falling edge and -12V at rising edge.
Second circuit I'm going to guess that the reverse breakdown voltage of the transistor basis-emitter is less than what can occur in this circuit, with that output circuit keeping the mid-point a short time at +12 at falling edge and -12V at rising edge.
