led How do I amplify a dc voltage that is too weak to trigger the base in a transistor


Posted on Feb 6, 2014

Take the voltage output from a 3. 5mm audio jack and have it light up an LED according to it`s voltage. I was going to attach the left audio cable to the base of a 2222n transistor which would act as my amplifier to trigger the LED to light. Unfortunately, the voltage reading off the wire is like. 2 or. 02 and isn`t high enough to tri


led How do I amplify a dc voltage that is too weak to trigger the base in a transistor
Click here to download the full size of the above Circuit.

gger the flow. Is there any way to increase the voltage to trigger the transistor or would I have to use a transformer of some sort (or an op amp )




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