Re: Resistor sizing
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Two alternate ways of doing this:
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1. Use a potentiometer instead of individual resistors. A 1 megohm pot should work well. Just connect the leads to one end and the wiper and adjust until you get the brightness you desire, then measure the value of the pot with an ohmmeter and pick the closest resistor value to put in your circuit. 2. Use a decade box. These are somewhat more costly than a pot. Using the switches you select resistor values until you get the brightness you want. Multiple "ON" selections are added together within the box and you pick a resistor close to the sum of all resistors selected. In either case remember to start with a high value and work down. Starting low you could blow the LED with too much current. Rick Jones If at first you don't succeed, skydiving is not for you. On 9/18/2023 1:57 PM, Dennis Beutler wrote:
Hi I m new to some of this . What ? iam trying to do ?is to dim leds down ?.I have tried several different types of resistors like 470, ?680 , ?750 and 1k ohms and can¡¯t ?dim them . ?I used resistor calculators online ?and still haven¡¯t gotten the hang of it ?at what point do they start ?to dim down what I have now is a color code of ?first line is brown ?black ?and yellow the last one is gold ?. ? What ohms would this be ? This dims it down to where I need to be. ?Sorry for making this a dumb question , I have never did any calculations for resistors. thanks |
Rick Jones