Why Push Pull Can not work in this manner? -

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worng push pull

why push pull type wrong? want switch positive or negative. can explain me?

because haven't limits of current , / or tension.

in pnp, , npn transistors, in pin allways blow-up transistors.

suppose in pin @ 0v or gnd. pnp transistor have more -0,7v of vbe , blows up. same every voltage of in pin below of vcc-0,7v = 11,3v.

the pnp transistor not blows if 11,3v<=in<=12v=vcc. when in in high (11,3v<=in), vbe of npn if more 0,7v , blows npn transistor.

you need resistor limit current , tension of both bases of transistor (r in serial base)

moreover.

in both circuits, when in's voltage vcc/2=6v. both transistors saturated , acts shortcircuit (vce 0v). there not limits current , blow both transistors.

when change 1 0 or change 0 1, both transistors blows up

you need sure 1 transistor active, saturated or closed, , not other transistor (opened)


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