The figure above shows a simplified circuit of 80- serial-connected LED lamps of which each VT = 2.7 v and the resistance Ri = 10Ω in the forward direction. Otherwise, we assume the diode to be ideal.
A) Determine R and C so that the current id through the LEDs is limited to flactuate between 8 and 10mA when the circuit is connected to the network voltage.
B) Draw id(t) and uc(t). Give the time and top values.