Aattached are two views of an ab amp. each one has a diode in the input section facing in a different direction, The left one is plated so that there is only input to the pnp transistor and the right so that there is only input to the npn transistor. This is all as expected.
My question is, why are the two transistors facing down (the ones under the 10k resistors) letting current flow, since they are supposed to block negative current. The question is probably naive but please could someone enlighten me?

 

Hi nt.
Who created those two circuits?
E

 

Aattached are two views of an ab amp. each one has a diode in the input section facing in a different direction, The left one is plated so that there is only input to the pnp transistor and the right so that there is only input to the npn transistor. This is all as expected.
My question is, why are the two transistors facing down (the ones under the 10k resistors) letting current flow, since they are supposed to block negative current. The question is probably naive but please could someone enlighten me?

Hi,

Something does not look right there.

 

Hi,

Something does not look right there.

I got it off the internet, it's a training video, as you'll see

https://www.bing.com/videos/rivervi...293693D641480808E2DE293693D64148080&FORM=VIRE

 

hi nt,
Remove those two input diodes.
E