Pick the color stripes, pick the number of stripes, and it'll tell you what value the resistor you have in hand is.

Bank for Good was born out of a coalition of organizations coming together to elevate a financial system that makes it easy for people to align their values with their financial decisions. We knew that there were great banks, credit unions, and other financial institutions committed to a fossil-free future, and we wanted to make it easy for you to find them and join the movement.

Bank for Good is not funded by any financial institutions.

A website that takes a parrticular frequency (in KHz) and a duty cycle (at least 50%, or on half the time, off half the time) and calculates the values of the two resistors and the capacitor required to generate that frequency using a 555 IC.