http://www.electronics-tutorials.ws/waveforms/555_oscillator.htmlUsing the square wave signal generator.
For the 555 timer, how have they got the times for charging to be t=ln(2)RC
The time for charging through 2 resistors for a capacitor should be Vin/3 / (R1 + R2) = I
Because we are only charging 1/3 of Vin, from 1/3 of Vin to 2/3 of Vin.
The voltage of the capacitor should be 2Vin/3 and put into the equation C=Q/V we get C = 3Q/Vin.
The charge transfered during that time are equal so we sub for Q.
Getting t = 2C(R1+R2), where have they gotten ln(2)(R1+R2) = t for charging time?