- Joined Mar 24, 2008
At some point we are introduced to Time Constants in our electronics education in charging a capacitor through a resistor. Which equals:
It is fundamental to all RC circuits. The 555 IC uses 1/3 Vcc to .67Vcc as its unit for timing, which works out to approx .69 TC. This is where the number .7 comes from in it timing formula.
From the formula shown we derive the classic charge curve
I created this graph as a handy reference for myself. Since it was for myself I assumed the % meant % of Vcc.
Here is my question, Given a known charge rate in amps what is the %Vcc of the cap in a given time?
I do know the curve is linear similar to what is show below.