kennedy1883
New member
resistors. help with resistors please? disclaimer: This is for a class project and is not for practical use. Using an AC bike generator that I have clocked at 20 volts (max) with .5 amps I am attempting to set-up a progressive LED circuit. progressive meaning that as you pedal faster, more voltage is produced and more LEDs light up. using 3.5 volt LEDs I know this works. when the generator puts out 3.5 volts the first LED lights. Then I have 2 more LEDs in a separate series so when the generator hits 7 volts, the two LEDs light and so on and so forth. similar to a carnival hammer game. (hit the thing harder and the weight goes closer to the bell only this one is based off of bicycling). My issue is that once the voltage reaches a higher level i'd like the lower LEDs to not blow out from too much voltage. I know that this involves resistors but i'm not sure which ones or anything. Can anyone help me figure out the circuit? Here is the technical data if it helps... Generator rated for 12 volts/6 watts. (has been tested to 20 volts) LEDs are 3.5 volt and 20 mA. thank you and let me know if more information is needed