- #1
preet
- 98
- 0
Could some one please help me understand the current flow in this circuit (electron flow theory)... specifically, how does the capacitor charge, and how do the two transistors open/close? So far this is what I think...
The current leaves the negative terminal, splits up into both branches... in the left path, the current goes into the emitter of the transistor (NPN) to the base, allowing current to flow from the emtter to the collector... much of the current returns to the positive terminal after leaving the collector, but some current takes the path through the resistor and the capacitor, charging it. In the right path, the current canot go past the transistor until it is opened by current flowing through the base to the emitter (PNP), but by this time, the capacitor is already charged and the current flowing through the circuit is practically nothing... this is as far as I get. I don't know how the current flows when the capacitor discharges...to discharge fully, energy has to be used up by the speaker.
So if anyone could explain if what I have is right, and what happens after the capacitor charges, i'd appreciate it. Thanks.
http://img114.echo.cx/img114/4327/circuit2cy.gif
The current leaves the negative terminal, splits up into both branches... in the left path, the current goes into the emitter of the transistor (NPN) to the base, allowing current to flow from the emtter to the collector... much of the current returns to the positive terminal after leaving the collector, but some current takes the path through the resistor and the capacitor, charging it. In the right path, the current canot go past the transistor until it is opened by current flowing through the base to the emitter (PNP), but by this time, the capacitor is already charged and the current flowing through the circuit is practically nothing... this is as far as I get. I don't know how the current flows when the capacitor discharges...to discharge fully, energy has to be used up by the speaker.
So if anyone could explain if what I have is right, and what happens after the capacitor charges, i'd appreciate it. Thanks.
http://img114.echo.cx/img114/4327/circuit2cy.gif