Hey guys
I'm having a little trouble understanding how the PNP transistor in this circuit conducts half of the audio wave form as I believe that it must source it's current from the NPN transistor & if the PNP is to conduct on the negative half of the wave form (As this is what it's job is) It would need to have current available at it's emitter to pass through it's collector to ground? I presume that the load (speaker) goes in between the two transistors & then goes to ground? My main point of confusion is that if the NPN transistor is off & the audio signal at the bases of the transistors is in it's negative cycle, then where does the PNP get it's power from ? I presume that in the negative half of the cycle that the NPN is off and therefore not passing current and since the PNP gets it's current from the NPN then wouldn't the total current come to a stand still? Any advice would be appreciated as I have been racking my brain for a couple of days over this little thing. I presume that there is some kind of loophole that allows a little current to flow by biasing the bases but would that mean that the PNP can't fully switch on and therefore not conduct as strongly as the NPN? I can kind of see how this circuit would work if it were to be used with a couple of transformers at either end of the circuit but just a little confused as to how to go about the design with a transformerless circuit.
I'm having a little trouble understanding how the PNP transistor in this circuit conducts half of the audio wave form as I believe that it must source it's current from the NPN transistor & if the PNP is to conduct on the negative half of the wave form (As this is what it's job is) It would need to have current available at it's emitter to pass through it's collector to ground? I presume that the load (speaker) goes in between the two transistors & then goes to ground? My main point of confusion is that if the NPN transistor is off & the audio signal at the bases of the transistors is in it's negative cycle, then where does the PNP get it's power from ? I presume that in the negative half of the cycle that the NPN is off and therefore not passing current and since the PNP gets it's current from the NPN then wouldn't the total current come to a stand still? Any advice would be appreciated as I have been racking my brain for a couple of days over this little thing. I presume that there is some kind of loophole that allows a little current to flow by biasing the bases but would that mean that the PNP can't fully switch on and therefore not conduct as strongly as the NPN? I can kind of see how this circuit would work if it were to be used with a couple of transformers at either end of the circuit but just a little confused as to how to go about the design with a transformerless circuit.