Hi all. I am building out a slot racer controller using a tip120 to control the voltage to the track but I seem to only be able to supply up to 5v max. My setup is: 9v dc supply +ve running to the collector on the tip120 tip120 emitter running to the +ve line on the track -ve line on the track run…

controlling 9v through tip120 - only hitting 5v max

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