This Design Idea describes a simple two-chip CMOS circuit that can sort capacitors into 20 bins over a wide range (100pF to 1μF), using 10 LEDs to display the value range. The circuit is power efficient and can be run using two CR2032 cells. As such, it can be built into a handheld probe. by Raju Baddi
Simple capacitance meter bins parts – [Link]
This project is a multicolored LED light based on CD4093. Adjusting the brightness of each group is provided by a generator whose frequency is fixed but whose duty cycle (temporal relationship between high and low) is variable. It consists of a fixed frequency oscillator and variable duty cycle for each of three colors. Each oscillator operates independently, which helps determine the degree of brightness of each red, green and blue.
Multicolored LED with CD4093 – [Link]