No Resistor 2N3904 Triggered IR LED Breadboard Array

The breadboard wired up and a small button 3 volt cell triggering the array which runs off the 9 volt battery. Wiring Each group of 4 LEDs is in series, the positive lead of the top LED is connected to the negative lead of the one below it. Since each LED is attached to two rails on the perf …
By: peterpeter

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